New bis(pyranodithiolene) tungsten(IV) and (VI) complexes as chemical analogues of the active sites of tungsten enzymes

摘要

First examples of tungsten complexes,(Et4N)2[WO(L~0)2X(Et4N)2 [1a]) and (Et4N)2[WO2(L~0)2]((Et4N)2 [1b]),containing pyranodithio-lene were synthesized as new models of reaction center of tungsten enzymes.The complexes were characterized by IR,UV-Vis,Raman spectroscopies,and cyclic voltammogram (CV).The crystal structures were determined by X-ray crystallography.The pyrane ring affected the W=O bond stretchings in la and 1b,the redox potential of la,and LMCT bands of 1b.