SYNTHESIS AND CHARACTERIZATION OF DIIMINE ADDUCTS oF BIS(N-ALKYL-N-FURFURYLDITHIOCARBAMATO-S,S ')CADMIUM(II): CRYSTAL STRUCTURE OF BIS(N-FURFURYL-N-PROPYLDITHIOCARBAMATO-S,S ')(1,10-PHENANTHROLINE)CADMIUM(II)

摘要

A series of homoleptic and heteroleptic complexes: [Cd(fprdtc)(2)] (1), [Cd(fprdtc)(2)(1,10-phen)] (2), [Cd(fprdtc)(2)(2,2'-bipy)] (3), [Cd(bufdtc)(2)] (4), [Cd(bufdtc)(2)(1,10-phen)] (5), and [Cd(bufdtc)(2)(2,2'-bipy)] (6)(where fprdtc = N-furfuryl-N-propyldithiocarbamate; bufdtc = N-butyl-N-furfuryldithiocarbamate) have been prepared and characterized. A single crystal X-ray structural analysis was carried out for 2. Reduction in nu C-N (thioureide) for the heteroleptic complexes (2, 3, 5, and 6) compared to that of homoleptic complexes (1 and 4) is attributed to the change in coordination number from four to six and steric effect exerted by 1,10-phenanthroline and 2,2'-bipyridine. The downfield shift of (NCS2)-C-13 carbon signal for heteroleptic complexes from the chemical shift value of homoleptic complexes is also attributed to the increase in coordination number. Single crystal X-ray structure of 2 indicates that the mononuclear structure of 2 shows symmetric coordination of the dithiocarbamate ligands and a distorted octahedral geometry for cadmium, defined by an N2S4 donor set, results. In this crystal structure, most significant pi-pi interaction is also observed.