Jacques Nasielski

Quantum yield for photosubstitution of a co group in chromium hexacarbonyl by pyridine

Abstract The quantum yield of the photosubstitution of CO by pyridine in cyclohexane has a value of 0.67 ± 0.02 for [Cr(CO) 6 ] = 3.10 −4 mol l − and [pyridine] = 10 − mol l −1 .

Organometallic compounds. XVI. Matrix representations of trigonal-bipyramidal structures and of the pseudo-rotations describing their intramolecular rearrangements

Matrix representations are given for five-coordinate structures (product matrices P) and for the intramolecular isomerization reactions of these complexes (reaction matrices R) via pseudo-rotation processes. Matrix transformations are also described, which allow to deduce from the general case the subset of rearrangements generated by various constraints (using constraint matrices C). Several examples are depicted and compared with previous descriptions.