Original scientific paper

Preparation, Thermal Analysis and Spectral Characterization of the 1:1 Complexes of Mercury(II) Halides and Pseudohalides with 3,4,5,6-Tetrahydropyrimidine-2-thione. Crystal Structures of Bis(3,4,5,6-tetrahydropyrimidine-2-thione-S)mercury(II) Tetrachloro and Tetrabromomercurate(II)

Zora Popović ; Laboratory of General and Inorganic Chemistry, Faculty of Science, Chemistry Department, University of Zagreb, Ul. kralja Zvonimira 8, 10000 Zagreb, Croatia
Dubravka Matković-Čalogović ; Laboratory of General and Inorganic Chemistry, Faculty of Science, Chemistry Department, University of Zagreb, Ul. kralja Zvonimira 8, 10000 Zagreb, Croatia
Gordana Pavlović ; Laboratory of General and Inorganic Chemistry, Faculty of Science, Chemistry Department, University of Zagreb, Ul. kralja Zvonimira 8, 10000 Zagreb, Croatia
Željka Soldin ; Laboratory of General and Inorganic Chemistry, Faculty of Science, Chemistry Department, University of Zagreb, Ul. kralja Zvonimira 8, 10000 Zagreb, Croatia
Gerald Giester ; Institut filr Mineralogie und Kristallographie, Geozentrum, Universitat Wien, Althanstrafle 14, A-1090 Wien, Austria
Maša Rajić ; Laboratory for Thermal Analysis, Brodarski Institute - Marine Research and Special Technology, Av. V. Holjevca 20, 10000 Zagreb, Croatia
Dražen Vikić-Topić ; Ruđer Bošković Institute, NMR Centre, R O. Box 180, HR-10002 Zagreb, Croatia

Abstract

Mercury(II) complexes of the type HgX₂(H₄pymtH) (X = Cl-, Br-, I-, SCN-, CN-; H₄pymtH = 3,4,5,6-tetrahydropyrimidine-2-thione) have been obtained and structurally characterized by X-ray diffraction, IR, 1H and 13C NMR spectroscopy. Single crystal X-ray structure analysis was performed for the chloro and bromo complexes, which were found to be isostructural. Their crystal structures consist of [Hg(H₄pymtH)₂]2+ complex cations and [HgX₄]2- complex anions interconnected by Hg⋅⋅⋅X contacts into puckered sheets. The crystal structure of H₄pymtH has been redetermined to greater accuracy. In solution NMR spectra of complexes, the greatest complexation effects were found on the 13C Chemical shift of the thio-keto-carbon atom and on the 1H Chemical shift of the NH protons.

Keywords

mercury(II) complexes; heterocyclic thiones; crystal structure; thermal analysis; ¹H and ¹³C NMR spectra

Hrčak ID:

131828

URI

https://hrcak.srce.hr/131828

Publication date:

2.4.2001.

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