Synthesis and spectroscopic characterization of tin(II) and tin(IV) complexes containing 2,3,5,6-tetrakis(alpha-pyridyl)pyrazine as a bridging ligand
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
Authors: Bitzer, RS; Teles, WM; Abras, A; Ardisson, JD; Filgueiras, CAL
Abstract
In this work we investigated the reactivity of the nitrogen heterocyclic ligand 2,3,5,6-tetrakis(alpha-pyridyl)pyrazine, TPP, towards six tin-containing reagents, namely SnCl2, SnX4 (X = Cl or Br, SnRCl3 (R = Ph or Me), and SnPh2Cl2. The products were characterized by microanalysis (C, H, N, and Sn), IR spectroscopy (4000-200 cm(-1)), H-1, C-13 {H-1}, C-13-CP/MAS, Sn-119, and Sn-119-MAS NMR spectroscopy, as well as by Sn-119 Mossbauer spectroscopy. All reactions yielded bimetallic adducts, in which TPP behaved as a bis-bidentate bridging ligand, binding to each metallic center through two pyridine nitrogen atoms. This coordination mode is so far quite rare and, for the first time, is reported for main group metal-TPP complexes.
Complexes of some group IV metal halides, acetate and organotins with thioacetamide
SYNTHESIS AND REACTIVITY IN INORGANIC AND METAL-ORGANIC CHEMISTRY
Authors: Jalil, NSN; Tolorunjo, F
Abstract
Reactions of silicon tetrachloride, titanium tetrachloride, zirconium tetrachloride, tin tetrachloride, trimethyltin chloride, dibutyltin diacetate and tributyltin chloride with thioacetamide led to the formation of non-ionic and stable complexes of the formula MCl4.(TA)(2) and SnX4.(TA)(2) (where M = Si, Ti, Zr or Sn and X = Cl and CH3, CH3COO and C4H9 or C4H9 and Cl, and TA = thioacetamide). These complexes were characterized by melting/decomposition point determinations, analytical data, conductivity measurements and spectroscopic (UV and IR) studies. An octahedral geometry is proposed for all the complexes and coordination through sulphur is predicted.