Inorganic Chemistry, Vol.46, No.17, 7189-7192, 2007
Raman spectrum of [Ru(CNBUt)(Co)(eta(2)-C6H4-2-CHO)(PPh3)2][BF4]center dot 2CDCl(3) shows that the crystal lograph ical ly determined bifurcated hydrogen-bonding interaction Cl3CD... F2BF2- is an example of a blue-shifting hydrogen bond
Raman data suggest that a crystallographically determined Cl3CD... F2BF2- interaction in the solid-state structure of [Ru(CNBut)(CO)(eta(2)-C6H4-2-CHO)(PPh3)(2)][BF4]center dot 2CDCl3 is an example of a blue-shifting bifurcated hydrogen bond. The v(C-D) band blue-shifts 5 cm(-1) to 2269 cm(-1) compared to 2264 cm(-1) for CDCl3 in the gas phase and 20 cm-1 from frozen CDCl3 at 2249 cm-1. A conventional interpretation of these band shifts would suggest that the CCl2 fragment of DCCl3 is a stronger hydrogen-bond acceptor than the BF2 fragment of a BF4- group.