A pressure-tuning micro-Raman study of crystalline pentacarbonyl(chloro)rhenium(I), Re(CO)5Cl

Effect of high external pressures on the vibrational spectra of Zeise’s complexes, K[Pt(η2-C2H4)Cl3] and [Pt(η2-C2H4)Cl2]2

“…Only the 1418 cm À1 peak, displayed a negative pressure dependence and it is considered to be most likely associated with the C@C stretching mode. We reached this conclusion on the basis of earlier work by Adams and Ekejiuba [19] and by us [20][21][22][23][24] on transition-metal carbonyl complexes in which negative pressure dependences for certain m(CO) modes could be associated with increased p-backbonding under pressure. Further support for this conclusion comes from the most recent normal-coordinate calculation on ZeiseÕs salt and its perdeuterated analogue [25].…”