Synthesis and structural analysis of tungsten-carbonyl dimers bridged with oligo(2,5-dialkoxy-1,4-phenylene vinylene)s through pyridine coordination.

Tungsten carbonyl dimers bridged with oligo(2,5-dialkoxy-1,4-phenylene vinylene)s through coordination with pyridine as the end groups, expressed as [W(CO)5]2-(nPV-Py2) [n = 1, 3; alkoxy = O(CH2)2OSi(i)Pr3], have been prepared from W(CO)5(THF) with nPV-Py2 in THF, and their structures were determined by X-ray crystallography. Both increase in absorbance and redshift in the λmax values in [W(CO)5]2-(nPV-Py2) from their nPV-Py2 were observed in the UV-vis spectra, due to increase in the conjugation length through tungsten by coordination of the pyridine moiety; an extension of the conjugation was also confirmed by the crystallographic analysis as well as fluorescence spectra.