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Density Functional Study of the Primary Photoprocesses of Manganese Pentacarbonyl Chloride (MnCl(CO)(5)).

Authors:
Maikel P. Wilms Evert Jan Baerends Angela Rosa Derk J. Stufkens

Inorg Chem 1997 Apr;36(8):1541-1551

Afdeling Theoretische Chemie, Vrije Universiteit, De Boelelaan 1083, 1081 HV, Amsterdam, The Netherlands, Dipartimento di Chimica, Universitá della Basilicata, Via N. Sauro, 85, 85100 Potenza, Italy, and Anorganisch Chemisch Laboratorium, J. H. van't Hoff Research Insitute, Universteit van Amsterdam, Nieuwe Achtergracht 166, 1018 WV, Amsterdam, The Netherlands.

Density functional calculations have been performed on the ground and excited states of MnCl(CO)(5) in order to explain the photochemistry of MX(CO)(5) complexes (M = Mn, Re; X = Cl, Br, I). As found earlier for Mn(2)(CO)(10) (Inorg. Chem. 1996, 35, 2886), the e(g)-type unoccupied 3d orbitals in the pseudooctahedral environment are located rather high in the virtual orbital spectrum, and the corresponding ligand-field (LF) excitations are more than 1 eV above the lowest excitations. Potential energy curves (PECs) nevertheless show that the lowest excited states, which involve transitions to the Mn-Cl sigma orbital at equilibrium geometry, are dissociative for axial and equatorial CO loss. The mechanism is again, as in Mn(2)(CO)(10), a strongly avoided crossing of the lowest excited state (a(1,3)E) with the higher dissociative LF states (different ones for CO(ax) and CO(eq) dissociation) which rapidly descend upon Mn-CO bond lengthening. In spite of the lowest excitation being to the Mn-Cl sigma-orbital, Mn-Cl homolysis cannot occur out of the lowest excited state. The photochemical behavior of Mn(2)(CO)(10), MnH(CO)(5), and MnCl(CO)(5) is compared. The mechanisms of CO loss are found to be very similar, but there is a large difference with respect to the breaking of the sigma bond (Mn-Mn, Mn-H, or Mn-Cl). Only in the case of Mn(2)(CO)(10), the lowest broad absorption band contains the sigma --> sigma excitation and leads to sigma bond breaking.

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http://dx.doi.org/10.1021/ic960688+DOI Listing
April 1997

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