873785-18-3Relevant academic research and scientific papers
Spectroscopy and electrochemistry of new 6,6′-disubstituted-4, 4′-bipyrimidine molybdenum(O) and tungsten(O) tetracarbonyl complexes
Ioachim, Elena,Hanan, Garry S.
, p. 1114 - 1119 (2005)
A new family of tetracarbonyl molybdenum(O) and tungsten(O) complexes based on new 6,6′-disubstituted-4,4′-bipyrimidine ligands was synthesized and characterized. The visible region of the absorption spectrum of each complex is dominated by a metal-to-ligand charge transfer band significantly lower in energy than the corresponding transition in 2,2′-bipyridine tetracarbonyl metal complexes. The 6,6′-substituents create a larger π-electronic system in the substituted bipyrimidines and are consequently better π acceptors than even the parent 4,4′-bipyrimidine. The absorption bands are shifted bathochromically with a decrease in solvent polarity.
