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Type: Artigo de periódico
Title: Thermochemistry of adducts of tin(IV) chloride with heterocyclic bases
Author: Dunstan, PO
Abstract: The compounds [SnCl4(L)(n)] (where L is pyridine (py), 4-methylpyridine (gamma-pico), 3-methylpyridine (beta-pico), piperidine (pipd), morpholine (morph), piperazine (pipz), 3-cyanopyridine (3-cyanopy), 4-cyanopyridine (4-cyanopy), quinoline (quin) or 2,2'-bipyridine (bipy) and n = 2, 1 or 3/2) were synthesized and characterized by elemental analysis, melting points, thermal studies and IR spectroscopy. The enthalpies of dissolution of adducts, tin(IV) chloride and ligands in 1,2-dichloroethane or 25% (v/v) aqueous HCl 1.2 M in methanol were measured and, by using thermochemical cycles, the following thermochemical parameters for the adducts have been determined: the standard enthalpies for the Lewis acid/base reaction (Delta(r)Hdegrees), the standard enthalpies of formation (Delta(f)Hdegrees), the standard enthalpies of decomposition (Delta(r)Hdegrees), the lattice standard enthalpies (Delta(M)Hdegrees) and the standard enthalpies for the Lewis acid/base reaction in the gaseous phase (Delta(r)Hdegrees). The mean standard enthalpies of the tin-nitrogen bonds ((D) over bar ((Sn-N))) have been estimated. Based on these last values, the basicity orders: pipd > morph > gamma-pico = beta-pico > py > 4-cyanopy > 3-cyanopy and pipz > quin are obtained. (C) 2002 Elsevier Science B.V. All rights reserved.
Subject: sn-N bonds
tin(IV) chloride
thermochemical parameters
heterocyclic bases
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/S0040-6031(02)00326-X
Date Issue: 2003
Appears in Collections:Unicamp - Artigos e Outros Documentos

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