Science and Mathematics Faculty Publications

Title

Chemistry of 2,4,6-Trimercapto-1,3,5-triazine (TMT): Acid Dissociation Constants and Group 2 Complexes

Document Type

Article

Publication Date

7-13-2001

Journal Title

Inorganic Chemistry

Volume

40

Issue

17

First Page

4443

Last Page

4447

Abstract

The acid dissociation constants of 2,4,6-trimercaptotriazine (H3TMT, 1) were determined and now can be employed in the preparation of complexes having specific M−TMT (M = divalent metal; TMT = 2,4,6-trimercapto-1,3,5-triazinide, C3N3S33-) ratios. For example, the combination of H3TMT (1) with Mg(OH)2 at pH 7.1 leads to the crystallization of Mg(H2TMT)2·6H2O (4). With the appropriate pH adjustment, the contiguous series of compounds Ba3(TMT)2·8H2O (3), Ba(H2TMT)2·7H2O (5), and BaHTMT·3H2O (6) can be isolated. The compounds were characterized by mp, IR, TGA, elemental analysis, and, in the cases of 4, 5, and 6, crystallography. The comparison of 4 with 5 and 6 offers an interesting view of the difference in hard and soft bonding with TMT. In the saltlike Mg structure of 4, there is extensive hydrogen bonding, but in the Ba structures, 5 and 6, covalent Ba−S bonding dominates.

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