Dinuclear organotin(IV) coordination polymers derived from Schiff bases with L-aspartic acid

作者：Baul Tushar S Basu; Kehie Pelesakuo; Duthie Andrew; Hopf Herbert

来源：Journal of Organometallic Chemistry, 2017, 838: 24-36.

DOI：10.1016/j.jorganchem.2017.03.016

• Ditopic Schiff base amino acetates
• Dinuclear tin complexes
• Organotin(IV) compounds
• L-aspartic acid
• One- and two-dimensional coordination polymers

Reaction of sodium 2-((E)-((Z)-4-hydroxypent-3-en-2-ylidene) amino) succinate and sodium (E)-2-((1-(2-hydroxyphenyl) ethylidene) amino) succinate ((LHNa2)-H-1 and (LHNa2)-H-2) in a 1: 2 M ratio with Bz(2)SnCl(2) in methanol gave dinuclear diorganotin(IV) complexes of composition [Bz(2)Sn(L-x) SnBz(2)Cl] (L-x = L-1 (1) and L-2 (2)). Reaction of (LHNa2)-H-2 and Bz(3)SnCl (1: 2) in anhydrous toluene under reflux conditions yielded the analogous chlorine-free product of composition [Bz(2)Sn(L-2) SnBz(3)] (3) via cleavage of a Sn-C bond for one of the triorganotin precursor equivalents with elimination of toluene. In addition, the tributyltin(IV) compounds of composition [Bu3Sn((LH)-H-x) SnBu3] (L-x = L-2 (4) and L-3 (5)) were prepared in a single-step transformation by combining equimolar proportions of (Bu3Sn)(2)O, (S)-2-aminosuccinic acid and 2'-hydroxyacetophenone/ 2-hydroxybenzaldehyde in anhydrous methanol. The structures of the organotin( IV) compounds in solution were assessed using H-1, C-13 and Sn-119 NMR spectroscopic techniques, while the molecular structures of 1-5 were analyzed by single-crystal X-ray diffraction. In the solid state, complexes 1-3 exhibit one-dimensional coordination polymers with alternate six-and seven-coordinate tin atoms embedded in distorted monocapped trigonal-bipyramidal (1-2)/octahedral (3) and pentagonal-bipyramidal (1-2)/bicapped trigonal-bipyramidal (3) coordination environments. On the contrary, compounds 4-5 are two-dimensional coordination polymers based on 30-membered tetra-nuclear macrocyclic ring structures, in which the tin atoms comprise distorted trigonal-bipyramidal coordination polyhedra. However, in solution the polymeric structures of 1-5 dissociate to give dinuclear complexes, even in non-coordinating solvents such as chloroform.

• 出版日期2017-6-1