Synthesis and chemico-physical characterization of tin(IV) complexes with some crown ethers |
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| Affiliation: | 1. Department of Chemistry, Guru Jambheshwar University of Science & Technology, Hisar 125001, Haryana, India;2. Department of Chemistry, National Institute of Technology Kurukshetra, Kurukshetra 136119, Haryana, India;1. Department of Chemistry, Guru Jambheshwar University of Science & Technology, Hisar 125001, Haryana, India;2. Department of Chemistry, Govt. P. G. College, Guna, Jiwaji University, Gwalior 473001, India;3. Department of Pharmaceutical Chemistry, School of Pharmaceutical Sciences, Shoolini University, Solan 173229, India;4. Department of Pharmaceutical Sciences, Guru Jambheshwar University of Science & Technology, Hisar 125001, Haryana, India;5. Dept of Neuroendocrinology & Experimental Hematology, Chittaranjan National Cancer Institute, Kolkata 700026, India |
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| Abstract: | Some neutral adducts of diorganotin(IV) perchlorates and thiocyanates with three crown-ethers have been synthesised; they are of the type Me2SnX2Lm·nH2O where m = 1 or 2, n = 2 or 4, X = ClO4 or NCS, and L = 18-crown-6, 15-crown-5, and 12-crown-4. The values for m and n have been correlated with the coordinating ability of the two anions and with the steric hindrance by the crown ether molecules. From infrared and Mössbauer data, an octahedral coordination geometry is proposed for all the complexes. The Mössbauer parameters are discussed in terms of the electronegativity of the ligands on the tin(IV) center and of the distortions produced in the coordination polyhedra by the various crown-ether molecules. Preliminary DTG results suggest that it may be possible to obtain anhydrous complexes. |
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