Host-guest supramolecular complexes of the composition [M{NH(CH2)4O}{S2CN(C2H5)2}2] · CHCl3 (M = Zn, 63Cu(II)): Synthesis, structure, spectral properties, and thermal behavior

Abstract

Solvated forms of adducts [M{NH(CH2)4O}{S2CN(C2H5)2}2] · CHCl3 (M = Zn (I), 63Cu (II)) are preparatively isolated. Nonequivalence of the dithiocarbamate groups in structure I is revealed by the 13C MAS NMR method. According to the X-ray analysis data, adduct I is a supramolecular compound, whose structure includes a system of ordered channels occupied by outer-sphere solvating guest molecules of CHCl3 (structural type of lattice clathrates). The solvation of the initial adduct is accompanied by the structural unification of its isomeric forms and an increase in the strength of binding of the morpholine molecules and in the contribution of the trigonal-bipyramidal component to the geometry of the zinc polyhedron. The character of triaxial anisotropy of the EPR parameters of isotopically substituted compound II in the magnetically dilute state is due to the geometry of the copper polyhedron, which is intermediate between a tetragonal pyramid and a trigonal bipyramid with the ground state of an unpaired electron formed by mixing of the \(3d_{x^2 - y^2 } \)- and \(3d_{z^2 } \)-atomic orbitals (AO) of copper(II). The thermal destruction of compound I studied by simultaneous thermal analysis includes stages of desorption of solvating chloroform molecules and coordinated morpholine molecules and thermolysis of the “dithiocarbamate part” of the adduct.