Crystal structure and spectral characterization of dimethylthallium (III) complexes with 2-mercaptonicotinic acid and esters |
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Authors: | Monica Toma Agustín Sánchez María S García-Tasende José S Casas José Sordo Eduardo E Castellano Javier Ellena |
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Institution: | 1.Department of Inorganic Chemistry,“Alexandru Ioan Cuza” University,Iasi,Romania;2.Department of Inorganic Chemistry,University of Santiago de Compostela,Santiago de Compostela Galicia,Spain;3.S?o Carlos Institute of Physics,University of S?o Paulo,S?o Carlos,Brazil |
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Abstract: | Synthesis, spectral properties and crystal structure of dimethylthallium(III) complexes with 2-mercaptonicotinic acid (2mna),
2-mercapto-methyl-nicotinate (2mmn), 2-mercapto-ethyl-nicotinate (2men) and 2-mercapto-isopropyl-nicotinate (2min) are reported.
The compounds were characterized using IR, multinuclear NMR (1H,13C,205Tl) and mass spectrometry (electrospray, ES-API). The molecular structures of TlMe2(2mna)]·H2O, (1), TlMe2(2mmn)], (2), TlMe2(2men)], (3) and TlMe2(2min)], (4) were determined by the single-crystal X-ray diffraction. In 1, the monodeprotonate O,S-bidentate ligand chelates one dimethylthallium
(III) unit and simultaneously bridges (O and S) between two of these organometallic units. The Tl-O1′ and Tl-S″ interactions
are leading to polymeric chain linked in a three-dimensional network by the hydrogen bonds formed between the water molecule
and the oxygen O (2) atom of the acid. The thallium atom is in a distorted octahedral environment with a TlC2O2S2] kernel. Compounds 2, 3 and 4 are similar, in all the cases already mentioned the ligand is NH deprotonated and is strongly coordinated to two dimethylthallium
(III) units through the N and S atoms. Two additional weak interactions with the O and S atoms lead to a TlC2NOS2] kernel for the metal atom, in which the coordination polyhedron is a very distorted octahedron with the methyl groups occupying
the apical positions. |
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Keywords: | dimethylthallium(III) 2-mercaptonicotinic acid esters complexes crystal structure |
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