Heterocyclic Building Blocks-Isothiazole

In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Synthesis of D-camphor based γ-amino acid (1S,3R)-3-amino-2,2,3-trimethylcyclopentane carboxylic acid, published in 2010-03-30, which mentions a compound: 560-09-8, mainly applied to camphor based amino acid aminotrimethyl cyclopentane carboxylic synthesis; camphoric anhydride nucleophilic ring opening benzyl alc; isocyanate Curtius rearrangement hydrogenolysis, Recommanded Product: 560-09-8.

Synthesis of a γ-amino acid derived from (1R,3S)-camphoric acid is described. D-(+)-Camphoric anhydride, prepared from D-(+)-camphoric acid by treatment with methanesulfonyl chloride and triethylamine, was reacted with benzyl alc. and catalytic DMAP, and subsequently reacted in a Curtius rearrangement to afford the corresponding carbamate derivative This derivative was converted to the desired γ-amino acid through hydrogenolysis.

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Reference of (1S,3R)-1,2,2-Trimethylcyclopentane-1,3-dicarboxylic acid. The reaction of aromatic heterocyclic molecules with protons is called protonation. Aromatic heterocycles are more basic than benzene due to the participation of heteroatoms. Compound: (1S,3R)-1,2,2-Trimethylcyclopentane-1,3-dicarboxylic acid, is researched, Molecular C10H16O4, CAS is 560-09-8, about Homochiral ferroelectric three-dimensional cadmium(II) frameworks from racemic camphoric acid and 3,5-di(imidazol-1-yl)benzoic acid. Author is Su, Zhi; Lv, Gao-Chao; Fan, Jian; Liu, Guang-Xiang; Sun, Wei-Yin.

Two three-dimensional (3D) chiral frameworks, [Cd6(L)4(D-Cam)4(H2O)4]·2H2O (1D) and [Cd6(L)4(L-Cam)4(H2O)4]·2H2O (1L) [HL = 3,5-di(imidazol-1-yl)benzoic acid, D-H2Cam = D-camphoric acid, L-H2Cam = L-camphoric acid], were synthesized under hydrothermal conditions, which represent a nice example of enantioselectivity of organic racemic ligands (DL-camphorates) during the self-assembly process and formation of the metal complexes. Compounds 1D and 1L feature 3-dimensional framework with chiral chains constructed by Cd(II) cations and camphorate anions. Solid-state CD spectra of 1D and 1L revealed that they are enantiomers. Also, the complexes with chiral C2 space group display ferroelec. behavior with a remnant elec. polarization (Pr) of ∼0.140 μC/cm2 and an elec. coercive field (Ec) of ∼17.11 kV/cm.

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Synthetic Route of C5H7N3S. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: 2-Amino-6-methylpyrimidine-4-thiol, is researched, Molecular C5H7N3S, CAS is 6307-44-4, about Guanine phosphoribosyltransferase from Escherichia coli. Specificity and properties. Author is Miller, Richard L.; Ramsey, Gwendolyn A.; Krenitsky, Thomas A.; Elion, Gertrude B..

The specificity and properties of a novel guanine phosphoribosyltransferase of E. coli were studied and compared to those of the hypoxanthine-guanine phosphoribosyltransferase from other sources. The structural requirements for binding of purines to this enzyme were explored by the determination of the Ki values for 100 purines and purine analogs. The most effective binding occurred when the purine contained an oxo or SH group in the 6 position and an NH2 or OH group in the 2 position. Unlike the hypoxanthine-guanine phosphoribosyltransferase from other sources, this enzyme bound hypoxanthine 67 times less effectively than guanine and 4 times less effectively than xanthine. Rates of nucleotide formation from a number of purines and purine analogs were also determined The enzyme had a pH optimum from 7.4 to 8.2. From secondary double-reciprocal plots derived from an initial velocity anal., the Km values were 0.037mM for guanine and 0.33mM for 5-phosphoribosyl 1-pyrophosphate. The enzyme was sensitive to inhibition by p-chloromercuribenzoate, and this inhibition could be reversed by either dithiothreitol or β-mercaptoethanol. The apparent activation energy with guanine as substrate was 12,800 cal/mole below 23° and 3370 cal/mole above 23°. Using isoelec. focusing, the guanine phosphoribosyltransferase had an apparent pI of 5.50, while the pI of a 2nd enzyme which was specific for hypoxanthine was 4.8.

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In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called State of water in the dehydration products of beryllium and aluminum sulfates, published in 1973, which mentions a compound: 17927-65-0, mainly applied to NMR dehydration product hydrate; beryllium sulfate hydrate NMR; aluminum sulfate hydrate NMR; magnesium sulfate hydrate NMR, Reference of Aluminum(III) sulfate xhydrate.

The NMR of BeSO4.4H2O, Al2(SO4)3.18H2O and of the products of their dehydration were determined Some details of the NMR spectra of MgSO4.7H2O and its dehydration products were also investigated. Substantial increase of the interproton distance was observed in all the sulfates studied possessing low amounts of H2O. This phenomenon is explained by the strong polarization of the H2O mols. and by expansion of the O-H bonds.

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Name: 2-Amino-6-methylpyrimidine-4-thiol. Aromatic heterocyclic compounds can also be classified according to the number of heteroatoms contained in the heterocycle: single heteroatom, two heteroatoms, three heteroatoms and four heteroatoms. Compound: 2-Amino-6-methylpyrimidine-4-thiol, is researched, Molecular C5H7N3S, CAS is 6307-44-4, about High-yield regioselective thiation of biologically important pyrimidinones, dihydropyrimidinones and their ribo, 2′-deoxyribo and 2′,3′-dideoxyribo nucleosides. Author is Felczak, Krzysztof; Bretner, Maria; Kulikowski, Tadeusz; Shugar, David.

Convenient and high-yield regioselective thiation procedures based on the use of the Lawesson reagent in different solvents, are described for conversion of the 2- and 4-keto, and 2,4-diketo pyrimidines to the corresponding 2(4)-thio, and 2,4-dithio, derivatives This method is applicable to thiation of the 4-keto groups of 5,6-dihydropyrimidinones and pyrimidine nucleosides. The mild reaction conditions employed are such that it is the method of choice for compounds with labile glycosidic bonds, of choice for compounds with labile glycosidic bonds, such as 5,6-dihydropyrimidine nucleosides and the 2′,3′-dideoxynucleosides currently of interest as antiretroviral, including anti-HIV, agents.

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The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: (1S,3R)-1,2,2-Trimethylcyclopentane-1,3-dicarboxylic acid( cas:560-09-8 ) is researched.HPLC of Formula: 560-09-8.Rahman, Mohammad Arifur; Hopke, Philip K. published the article 《Mechanistic Pathway of Carbon Monoxide Off-Gassing from Wood Pellets》 about this compound( cas:560-09-8 ) in Energy & Fuels. Keywords: mechanistic pathway carbon monoxide off gassing wood pellet storage. Let’s learn more about this compound (cas:560-09-8).

The off-gassing of carbon monoxide (CO) from stored wood pellets was identified as a significant problem, potentially resulting in adverse occupational and residential exposures. The mechanism for the production of CO from wood pellets was not fully identified. A multiple step process was hypothesized. The reaction is initiated by the autoxidation of unsaturated compounds, including fatty acids and terpenes, by mol. oxygen. As a byproduct of these reactions, hydroxyl radicals are formed. Then, the bulk of CO results from the reactions of hemicellulose and hydroxyl radicals. To understand the mechanistic pathway of CO off-gassing, a number of experiments were conducted in which CO was measured and evolved organic compounds were analyzed using gas chromatog.-mass spectrometry (GC-MS). These studies identified a number of short- and long-chain aldehydes from the evolved gases that indicates the autoxidation mechanism. However, there is insufficient mass of these unsaturated compounds in wood to support the observed mass of off-gassed CO. However, autoxidation would form hydroxyl radicals. The role of hydroxyl radicals was studied using a radical scavenger, and its role in CO production was confirmed. Thus, if the autoxidation initiation can be eliminated, then CO off-gassing from pellets would be substantially reduced. Destruction of the reactive compounds with ozone led to a suppression of CO formation, suggesting an approach to process the wood fiber that would result in low or no CO emission wood pellets.

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In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Effects of milling of starting hydrated aluminum sulfate on η → α phase transformation and sinterability of alumina, published in 1986-02-01, which mentions a compound: 17927-65-0, Name is Aluminum(III) sulfate xhydrate, Molecular Al2H8O13S3, Reference of Aluminum(III) sulfate xhydrate.

The effects of milling of the precursor, Al2(SO4)3 (14-18)H2O, on η → α phase transformation and sinterability of α-Al2O3 were studied. Milling of the hydrated sulfate lowered the temperatures of dehydration, desulfation, and η → α phase transformation by about 30°, 20°, and 100°, resp. Dehydration of hydrated sulfate produced broken-eggshell-like anhydrous sulfate particles through melting of the hydrate in its water of crystallization On heating, the milled hydrated sulfate converted to anhydrous particles composed of finer sulfate particles. The anhydrous sulfate desulfated into aggregate grains of η-Al2O3 with an irregular pore size distribution. This η-Al2O3, finally formed skeletal grains of α-Al2O3 in which many cracks were produced. The optimum calcination temperature to prepare α-Al2O3 powder for sintering was lowered and the sinterability was improved by the milling treatment. The slope of Avrami-plots for η → α phase transformation indicated a 2-dimensional growth of α-Al2O3. The apparent activation energy for the transformation was 110 kcal/mol, which remained unchanged with milling. The enhancement of η → α phase transformation was due to accelerated nucleation in η-Al2O3 grains, and the sinterability of the α-Al2O3 was improved by an increase in the d. of green compacts, resulting from the occurrence of many cracks in the skeletal grains of α-Al2O3.

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Daimon, Keiji; Kato, Etsuro published an article about the compound: Aluminum(III) sulfate xhydrate( cas:17927-65-0,SMILESS:O=S(O)(O)=O.O=S(O)(O)=O.O=S(O)(O)=O.[H]O[H].[Al].[Al] ).Synthetic Route of Al2H8O13S3. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:17927-65-0) through the article.

The effects of milling of the precursor, Al2(SO4)3 (14-18)H2O, on η → α phase transformation and sinterability of α-Al2O3 were studied. Milling of the hydrated sulfate lowered the temperatures of dehydration, desulfation, and η → α phase transformation by about 30°, 20°, and 100°, resp. Dehydration of hydrated sulfate produced broken-eggshell-like anhydrous sulfate particles through melting of the hydrate in its water of crystallization On heating, the milled hydrated sulfate converted to anhydrous particles composed of finer sulfate particles. The anhydrous sulfate desulfated into aggregate grains of η-Al2O3 with an irregular pore size distribution. This η-Al2O3, finally formed skeletal grains of α-Al2O3 in which many cracks were produced. The optimum calcination temperature to prepare α-Al2O3 powder for sintering was lowered and the sinterability was improved by the milling treatment. The slope of Avrami-plots for η → α phase transformation indicated a 2-dimensional growth of α-Al2O3. The apparent activation energy for the transformation was 110 kcal/mol, which remained unchanged with milling. The enhancement of η → α phase transformation was due to accelerated nucleation in η-Al2O3 grains, and the sinterability of the α-Al2O3 was improved by an increase in the d. of green compacts, resulting from the occurrence of many cracks in the skeletal grains of α-Al2O3.

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The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Camphane derivatives. VII. Syntheses and structure of 3-methyl-3aβ,7aβ-bornano[3,2-d]oxazolidin-2-one and its derivatives》. Authors are Hamashima, Yoshio; Tori, Kazuo; Takamizawa, Akira.The article about the compound:(1S,3R)-1,2,2-Trimethylcyclopentane-1,3-dicarboxylic acidcas:560-09-8,SMILESS:CC1(C)[C@@H](CC[C@]1(C)C(O)=O)C(O)=O).Product Details of 560-09-8. Through the article, more information about this compound (cas:560-09-8) is conveyed.

cf. CA 62, 4055b. In connection with the elucidation of the structure of I and II, obtained by the reaction of 3α-methylaminocamphor (III) with COCl2, 3-methyl-3aβ,7aβ-(IV) and 3aα,7α-bornano[3,2-d]oxazolidin-2-one (V) and their derivatives were synthesized and studied stereochem. Their N.M.R. spectra were also investigated (tabulated and discussed). Excess COCl2 in C6H6 added dropwise with stirring to a boiling suspension of 10 g. III.HCl in dry C6H6 until dissolution gave 7 g. VI, m. 82° (Et2O-hexane), [α]25D 142° (CHCl3), showing a pos. Cotton effect on optical rotatory dispersion (ORD), 0.36 g. II, m. 193° (MeOH-Et2O), [α]25D 127.7° (CHCl3), showing a pos. Cotton effect on ORD, and 0.3 g. unchanged III.HCl. The resinous oil obtained on concentration redissolved in C6H6, the solution washed with 10% aqueous Na2CO3, dried, and concentrated, the oily residue kept several days (HCl evolved), the resulting solid extracted with Et2O, and the Et2O-soluble fraction washed with dilute aqueous Na2CO3, chromatographed on neutral Al2O3, and eluted with Et2O gave 5 g. I, m. 82° (Et2O-hexane), [α]25D -22° (CHCl3), showing a neg. plain curve on ORD; the product eluted with MeOH and the Et2O-insoluble solid combined and recrystallized from MeOH gave 0.40 g. II. VI (0.2 g.) refluxed 2 hrs. with 5 ml. 25% MeOH-HCl gave 0.092 g. I and 0.046 g. VII, m. 122°. VI(0.5 g.) refluxed 5 hrs. with 3 ml. SOCl2 gave 0.35 g. I, m. 82°. (VII,R=Me); (IX,R=Et); (X,R=Ac); (XI,R=Bz); A suspension of I in 4 ml. 2% HCl heated 30 min. at 80° on a steam bath until CO2 evolution ceased and the resulting solution concentrated to dryness gave 15 mg. III.HCl, m. 238° (decomposition). ClCO2Me (1 mole) added dropwise to 2 moles III in Et2O with stirring and ice cooling and the mixture stirred 1 hr. at room temperature, gave VIII, b1, 130-40°, m. 53-4°. A mixture of 100 mg. I and 200 mg. KOH in 10 ml. MeOH refluxed 10 hrs. gave VIII, b1 135°, m. 50°. I (480 mg.) in 5 ml. MeOH containing 500 mg. Na heated 30 min. at 70° gave 400 mg. VIII, b1, 130-40°. I (1 g.) in 15 ml. 30% MeOH-HCl refluxed 10 hrs. gave 0.6 g. VII, m. 122°. I (1 mole) in C5H5N heated 2 hrs. at 70° with 1.2 moles AgNO3 in MeOH also gave VII, m. 122°. I (1 g.) refluxed with 25% EtOH-HCl and worked up like VII gave 0.9 g. IX, b0.07 145°. Both VII and IX were easily hydrolyzed to III by concentrated HCl. A mixture of 2.44 g. I and 2 g. AgOAc in AcOH refluxed 8 hrs. gave 2.1 g. X, m. 107° (hexane), showing a plain neg. curve on ORD. I (240 g.) mixed with 230 mg. AgOBz and 2 g. BzOH, and the mixture heated 10 hrs. at 150-60° and cooled, and the product isolated by extraction with C6H6 gave 200 mg. XI, m. 153-4°, [α]23D -47.2° (CHCl3). Acid hydrolysis of both X and XI led to III, no other products or intermediates being obtained. I (100 mg.) in 10 ml. MeOH containing 200 mg. KOH hydrogenated over 100 mg. 10% Pd-C at room temperature and atm. pressure with stirring (9 ml. H absorbed during 1 hr.) gave 60 mg. IV, m. 119° (Et2O), [α]28D 108.2° (CHCl3), showing a pos. plain curve on ORD. IV was also obtained in fairly good yield by hydrogenation with Raney Ni in alk. medium. 3α-Aminoborneol (XII) (300 mg.) and 3 ml. 98% HCO2H heated 6 hrs. at 110° gave 150 mg. XIII, m. 143° (EtOH). XII (100 mg.) and 100 mg. HCONH2 heated 10 min. at 120° gave 100 mg. XIII, m. 143°. (XII,R=H); (XIII,R=CHO); (XIV,R=Me); (XVIII,R=Cl); (XIX,R=OH); (XXII,R=OAc); (XXIII,R=OMe); XIII (300 mg.) in tetrahydrofuran (THF) added dropwise to 200 mg. LiAlF4 in THF with ice water cooling and the mixture refluxed and stirred 4 hrs. gave 200 mg. XIV, m. 85-6° (hexane). III (3 g.) in Et2O added to 300 mg. LiAlH4 in Et2O and the mixture stirred 2 hrs. at room temperature gave 1.0 g. XIV, m. 85° (hexane). To a mixture of 500 mg. XIV, 10 ml. C6H6, and 10 ml. 10% aqueous Na2CO3 was added 20% C6H6COCl2 with stirring until the organic layer became clear (the mixture was kept alk. throughout the reaction) gave 510 mg. IV, m. 119° (Et2O), [α]26D 108° (CHCl3), IV (10 mg.) refluxed 6 hrs. with 2 ml. MeOH containing 200 mg. KOH gave 6 mg. XIV, m. 80-2°. XIV (200 mg.) and 2 ml. CS2 in 15 ml. EtOH refluxed until no more H2S was evolved (15 hrs.) (during the reaction addnl. CS2 was added) gave 120 mg. XV, m. 206° (MeOH). A suspension of 120 mg. XV and 500 mg. Raney Ni (WII) in EtOH stirred 3 hrs. at room temperature and kept overnight gave 50 mg. XIV, m. 80-2°. To 100 mg. XV in 1 ml. AcOH was added dropwise 35% H2O2 until no more turbidity occurred and the mixture let stand 2 hrs. at room temperature to give IV, m. 119°. 3α-Aminoisoborneol (200 mg.) and 1 ml. 98% HCO2H refluxed 5 hrs. gave 150 mg. 3α-formamido analog, m. 162° (Me2CO-Et2O), which (480 mg.) reduced with LiAlH4 in Et2O gave 300 mg. 3α-methylaminoisoborneol (XVI), m. 66-7° (Et2O-hexane) (HCl salt m. >310°). II (70 mg.) treated with 2 ml. C5H5N and 1 ml. Ac2O under ice water cooling and the solution kept ∼1 week at room temperature gave 60 mg. XVII, m. 120.5° (Et2O), [α]30D 150.3°, showing a pos. plain curve on ORD. XVII on hydrolysis with NaOH or HCl gave II. II(100 mg.) and 2 ml. SOCl2 refluxed 20 hrs. until gas evolution ceased gave 100 mg. XVIII, m. 132° (Et2O-hexane), [α]28D -21.5° (CHCl3), showing a pos. plain curve on ORD. II (100 mg.) and 500 mg. PCl5 in 2 ml. POCl3 refluxed 20 hrs. gave 80 mg. XVIII, m. 130-1°. XVIII (400 mg.) suspended in 10 ml. 10% HCl heated 15 hrs. at 100° gave quant. XIX, m. 254° (decomposition) (MeOH-Et2O), [α]24D 13.3° (CHCl3), showing a pos. plain curve on ORD. XVIII (260 mg.) in 10 ml. MeOH containing 620 mg. KOH heated 4 hrs. at 75° and kept overnight at room temperature gave 100 mg. camphor-quinone (XX), m. 190-5°, and 100 mg. XIX. XIX (130 mg.) in 3 ml. absolute MeOH containing 200 mg. Na kept 1 week at room temperature gave 40 mg. D-camphoric acid (XXI), m. 187° (Et2O-hexane), [α]25D 46.1° (EtOH), and a small amount XX. XXI (10 mg.) heated 4 hrs. at 140° with 10 mg. ZnCl2 and 500 mg. Ac2O gave 3 mg. camphoric anhydride, m. 220°. XIX (50 mg.) in 10 ml. MeOH containing 50 mg. KOH hydrogenated over 100 mg. Raney Ni at room temperature and atm. pressure with stirring (6 ml. H absorbed, during 1 hr.) gave 37 mg. II, m. 188-90°. Zn (600 mg.) added to 130 mg. XIX in 6 ml. AcOH at 100° with stirring, after 2 hrs. 600 mg. Zn added, and the mixture heated and stirred 2 hrs. gave 20 mg. unchanged XIX, and 45 mg. II, m. 190-2°. XVIII (40 mg.), 60 mg. AgOAc; and 1 ml. C5H5N in 1 ml. AcOH heated 3 hrs. at 100° gave 25 mg. XXII, m. 84-5° (Et2O-hexane), [α]22D 67.2° (CHCl3), showing a pos. plain curve on ORD. To 50 mg. XIX in 5 ml. C5H5N was added 1 ml. Ac2O with cooling and the solution kept 1 week at room temperature to give 50 mg. XXII, m. 84° (Et2O-hexane). Treatment of either XVIII or XIX with excess AgOAc in C5H5N gave XXII. XXII (20 mg.) heated 4 hrs. on a steam bath with 2 ml. 10% HCl gave XIX, m. 254° (decomposition) (Et2O). XIX (50 mg.) and 2 ml. SOCl2 refluxed 20 hrs. gave XVIII, m. 132° (Et2O-hexane). A mixture of 40 mg. XVIII, 60 mg. AgNO3; 2 ml. C5H5N, and 2 ml. MeOH heated 1.5 hrs. on a steam bath until no further precipitation of solid occurred gave XXIII, b0.05 110-20°, m. 76-8° (hexane), showing a small pos. plain curve on ORD. XVIII (20 mg.) in 2 ml. 25% MeOH-HCl heated 5 hrs. gave 12 mg. XXIII, b0.05 115°. XXIII (50 mg.) in MeOH hydrogenated over 100 mg. Raney Ni at room temperature and atm. pressure (1 mol. equivalent H was absorbed) gave XXIV, b0.15 120-30°, m. 48-50°. To 260 mg. XIX in AcOD (prepared from 10 ml. Ac2O and 3 ml. D2O) was added 1 g. Zn at 110° with stirring, after 1.5 hrs. 1.5 g. Zn added, and the mixture heated 4.5 hrs. to give XXV, m. 192-3°. XVIII (100 mg.) in 10 ml. MeOH containing 200 mg. KOH hydrogenated over 100 mg. 10% Pd-C at room temperature and atm. pressure (2 mol. equivalents H absorbed in 15 min.) gave 60 mg. IV, m. 119° (Et2O-hexane), and 13 mg. XIV, m. 84-5°. XVIII (55 mg.) in 10 ml. MeOH containing 100 mg. KOH hydrogenated over 200 mg. Raney Ni at room temperature and atm. pressure (2 mot. equivalents H absorbed in 15 min.) gave 28 mg. V, m. 123° (Et2O), [α]27D -33.3° (CHCl3), showing a neg. plain curve on ORD. The N.M.R. spectral evidence confirmed the assignment of the configurations of most of the compounds prepared Pertinent ir data were given and the N.M.R. spectra of IV and V recorded.

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Product Details of 17927-65-0. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: Aluminum(III) sulfate xhydrate, is researched, Molecular Al2H8O13S3, CAS is 17927-65-0, about Raman microscopy study of basic aluminum sulfate. Author is Kloprogge, J. T.; Frost, R. L..

The tridecameric Al Keggin cluster [AlO4Al12(OH)24(H2O)12]7+ was prepared by forced hydrolysis of Al3+ up to an OH/Al molar ratio of 2.2. Upon addition of sulfate the tridecamer crystallized as the monoclinic basic aluminum sulfate Na0.1[AlO4Al12(OH)24(H2O)12](SO4)3.55. These crystals were studied using FT-Raman microscopy and compared to basic aluminum nitrate, Na2SO4.xH2O and Al2(SO4)3.xH2O. The Raman spectrum of basic aluminum sulfate is dominated by two broad bands which are assigned to the ν1 and ν3 bands at 981 and 1051 cm-1 of the sulfate group in the Al13 sulfate structure. Also the band at 724 cm-1 is assigned to an Al-O mode of the polymerized Al-O-Al bonds in the Al13 Keggin structure. The sharp band at 1066 cm-1 and the minor band at 1384 cm-1 are interpreted as a small amount of nitrate impurity on a different position in the structure than the nitrate present in the Al13 nitrate crystal structure, based on the shift in band position of both the ν1 sym. stretching and ν3 asym. stretching modes.

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