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首页> 外文期刊>Polyhedron: The International Journal for Inorganic and Organometallic Chemistry >The thermodynamic studies of the molecular interactions of methyltin(IV) tribromide with free base meso-tetraarylporphyrins
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The thermodynamic studies of the molecular interactions of methyltin(IV) tribromide with free base meso-tetraarylporphyrins

机译:三溴化甲基锡(IV)与游离碱的内-四芳基卟啉分子相互作用的热力学研究

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摘要

The thermodynamic parameters for the interactions of MeSnBr3 with para- and meta-substituted meso-tetraphenylporphyrins (H2T(4-X)PP; X = OCH3, CH3, H, Cl, NO2 and H2T(3-X)PP; X = CH3, Cl) have been studied. The formation constants have been elucidated by using spectrophotometric titration and computer SQUAD program data refinement. The adducts of composition 2:1 and 1:l of MeSnBr3 to H2T(4-X)PP with stability constants K-1 and K-2 coexist in solution, but meta-substituted porphyrins form adducts of the composition 1:1 of MeSnBr3 to H2T(3-X)PP with stability constant K-1. Formation constants decrease with decreasing electron donation of para-substituted porphyrins as follow: H2T(4-CH3O)PP > H2T(4-CH3)PP > H2TPP > H2T(4-Cl)PP > H2T(4-NO2)PP. Despite the electron donation of the methyl group, H2T(3-Cl)PP forms more stable adducts than H2T(3-CH3)PP with MeSnBr3. (C) 2002 Published by Elsevier Science Ltd. [References: 30]
机译:MeSnBr3与对位和间位取代的内消旋四苯基卟啉(H2T(4-X)PP; X = OCH3,CH3,H,Cl,NO2和H2T(3-X)PP; X = CH3 ,Cl)已被研究。通过使用分光光度滴定法和计算机SQUAD程序数据精炼可以阐明形成常数。 MeSnBr3的组成2:1和1:l与稳定常数K-1和K-2的H2T(4-X)PP的加合物共存于溶液中,但间位取代的卟啉形成MeSnBr3的组成1:1的加合物稳定常数为K-1的H2T(3-X)PP。形成常数随对位取代卟啉的电子给体减少而降低,如下所示:H2T(4-CH3O)PP> H2T(4-CH3)PP> H2TPP> H2T(4-Cl)PP> H2T(4-NO2)PP。尽管有甲基的电子给体,但H2T(3-Cl)PP形成的加合物比带有MeSnBr3的H2T(3-CH3)PP稳定。 (C)2002由Elsevier Science Ltd.发布[参考:30]

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