Syntheses, characterization, and properties of rhenium(I) tricarbonyl complexes with tetrathiafulvalene-fused phenanthroline ligands

摘要

A series of tetrathiafulvalene-annulated phenanthroline ligands, 4′, 5′-dimethyldithiotetrathiafulvenyl[4, 5-f][1, 10]phenanthroline (L_1), 4′, 5′-ethylenedithiotetrathiafulvenyl[4, 5-f][1, 10] phenanthroline (L_2), and 4′, 5′-bis(methyloxycarbonyl) dithiotetrathiafulvenyl[4, 5-f][1, 10]phenanthroline (L_3), have been prepared by a facile and efficient synthetic procedure under mild conditions. Further coordination reactions of these ligands with Re(CO)_5Cl afford new rhenium tricarbonyl complexes, Re(CO)_3Cl(L) (L = L_1, 3a; L = L_2, 3b; L = L_3, 3c), respectively. X-ray crystal structure determinations on 3a, c reveal that the ligands are nearly planar and they show a unique packing mode in the solid state. The electrochemical and spectroscopic behavior of these compounds (L_1-L_3, 3a-c) has been studied. The results suggest that the redox-active tetrathiafulvalene- phenanthroline ligands are useful for new metal complexes.