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• W1994531251 abstract "Abstract The reaction of PtCl4 with (H-thiamine)Cl2 and (H-thiamine)(ClO4)2 in water produced a 1:1 salt (H-thiamine)[PtCl6]·H2O (1) and a 2:1 double salt (H-thiamine)2[PtCl6]Cl2·2H2O (2), respectively, whose crystal structures have been determined by X-ray diffraction. In both compounds, the Pt(IV) atom does not directly bind to thiamine but is linked as an octahedral [PtCl6]2− anion to a cationic thiamine; a [PtCl6]2− ion bridges between the thiazolium and the pyrimidinium moieties of the same thiamine molecule, through (i) a hydrogen bonding between the C(2)H of the thiazolium ring and the Cl− of the [PtCl6]2− ion and (ii) an electrostatic interaction between the pyrimidinium ring plane and the same Cl−. There is another type of anion bridge between the pyrimidinium and the thiazolium rings of the same thiamine molecule, through (i) a hydrogen bonding between the amino N(4′α)H of the pyrimidinium ring and the Cl− of the other [PtCl6]2− ion in 1 or the free Cl− ion in 2 and (ii) an electrostatic contact between the thiazolium plane and the same Cl−. Biological relevance of this host—guest-like anion coordination is mentioned in brief as a possible model for the substrate fixation to coenzyme and/or the coenzyme fixation to apoenzyme. Results are also compared with those of the [PtIICl4]2−/thiamine system (R.E. Cramer, R.E. Kirkup and M.J.J. Carrie, Inorg. Chem., 27 (1988) 123)." @default.
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• W1994531251 date "1993-08-01" @default.
• W1994531251 modified "2023-09-23" @default.
• W1994531251 title "The [PtIV Cl6]2−/thiamine system. Crystal structures of (H-thiamine)[PtCl6]·H2O and (H-thiamine)2[PtCl6]Cl2·2H2O: host—guest-like anion coordination" @default.
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• W1994531251 doi "https://doi.org/10.1016/s0020-1693(00)82818-2" @default.
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