Kinetic studies of the interaction between organotin(IV)chlorides and tetraaza Schiff bases: Synthesis and characterization of some novel tin(IV) Schiff base complexes |
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Authors: | Zahra Asadi |
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Affiliation: | Chemistry Department, College of Sciences, Shiraz University, Shiraz, Islamic Republic of Iran |
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Abstract: | In this article the kinetics of the interaction between the teteraaza Schiff bases as donor with organotin(IV)chlorides as acceptor was studied in acetonitrile. Teteraaza Schiff bases are (Me4‐Bzo2[14]tetraeneN4) (tmtaa), (Me4‐4‐CH3Bzo2[14]tetraeneN4) (Metmtaa), (Me4‐4‐ClBzo2[14]tetraeneN4) (Cltmtaa), i.e., [(Me4‐Bzo2[14]tetraeneN4)] means that (5,7,12,14‐tetramethyldibenzo[b,i][1,4,8,11] tetraazacyclotetradecine) (tmtaa) and organotin(IV)chlorides are methyltin(IV) trichloride, phenyltin(IV)trichloride, dimethyltin (IV)dichloride, diphenyltin(IV) dichloride, and dibutyltin(IV)dichloride. The kinetic parameters and the second‐order k2 rate constants show the donor properties of tetraaza Schiff bases as Me4‐4‐CH3Bzo2[14]tetraeneN4 > Me4‐Bzo2[14]tetraeneN4 > Me4‐4‐ClBzo2[14]tetraeneN4 and also the acceptor properties of organotin(IV)chlorides as PhSnCl3 > MeSnCl3 > Ph2SnCl2 > Me2SnCl2 > Bu2SnCl2. An excellent linearity of kobs vs. the molar concentration of the acceptor, the high span of k2 values, the large negative values of ΔS≠, and the low ΔH≠ values suggest an associative (A) mechanism for the acceptor–donor interaction. © 2011 Wiley Peiodicals, Inc. Int J Chem Kinet 43: 247–254, 2011 |
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