1:1 and 1:2 Complexes of Mercury(II) Halides with 1,3-Thiazolidine-2-thione. Spectral, Thermal, and Crystal Structure Studies |
| |
Authors: | Zora Popovi? Gordana Pavlovi? ?eljka Soldin Jasminka Popovi? Dubravka Matkovi?-?alogovi? Ma?a Raji? |
| |
Institution: | (1) Laboratory of General and Inorganic Chemistry, Faculty of Science, University of Zagreb, Ul. kralja Zvonimira 8, HR-10000 Zagreb, Croatia;(2) Polytechnic of Karlovac, I. Metrovia 10, HR-47000 Karlovac, Croatia;(3) Laboratory for Thermal Analysis, Brodarski Institute, Marine Research and Special Technology, Av. V. Holjevca 20, HR-10000 Zagreb, Croatia |
| |
Abstract: | The series of compounds of the general formulae HgX2(tzdtH) and HgX2(tzdtH)2 (X = Cl, Br, I; tzdtH = 1,3-thiazolidine-2-thione) have been prepared, as well as Hg(tzdt)2. IR, 1H, and 13C NMR spectral data of the complexes indicate thione donation, which is confirmed by the crystal structure analyses of HgBr2(tzdtH)]2, HgI2(tzdtH)]2, and HgI2(tzdtH)2. The structures of HgBr2(tzdtH)]2 and HgI2(tzdtH)]2 consist of centrosymmetric doubly bridged dimers, but they are not isostructural. The asymmetry in the HgX2Hg bridge is more pronounced in the bromo than in the iodo derivative S–Hg–X(terminal) is 138.19(9)° for X = Br and 123.49(10)° for X = I], which is accompanied by the stronger Hg–S covalent bond in the bromo than in the iodo complex 2.435(4) vs. 2.510(3) Å]. The Hg–X(bridging) (X = Br, I) bond distances are shorter than the sum of van der Waals radii for mercury and X. Dimeric centrosymmetric complex units are held together only by van der Waals forces in HgI2(tzdtH)]2, while in HgBr2(tzdtH)]2 there is an intramolecular hydrogen bond of N–H Br type (3.34(1) Å). HgI2(tzdtH)2 exists as a mononuclear tetrahedral complex with two long Hg–S 2.672(1) Å] and two short Hg–I bond distances 2.688(1) Å] related by a twofold axis. The molecules of HgI2(tzdtH)2 are linked into infinite chains along the c axis by intermolecular N–H S 3.38(1) Å] hydrogen bonds. |
| |
Keywords: | Mercury(II) halide complexes heterocyclic thione crystal structures 1H and 13C NMR TGA-DTA analysis |
本文献已被 SpringerLink 等数据库收录! |
|