Mainz 2017 – scientific programme
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MO: Fachverband Molekülphysik
MO 4: Spectroscopy of Cold Molecules and Complexes
MO 4.2: Talk
Monday, March 6, 2017, 17:15–17:30, N 25
Cryo IR spectroscopy of a tetranuclear cobalt carbonyl complex in isolation — •Sebastian Dillinger1, Jennifer Mohrbach1, Johannes Lang1, Pierre Braunstein2, and Gereon Niedner-Schatteburg1 — 1Fachbereich Chemie and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany — 2Laboratoire de Chimie de Coordination, Institut de Chimie, UMR 7177 CNRS, Universite de Strasbourg, 67081 Strasbourg, France
We present well resolved Infrared Multiple Photon Dissociation (IR-MPD) spectra of isolated [Co4(CO)n(dppa-H+)]− (n = 3 - 10, dppa = NH(PPh2)2) in the carbonyl stretching region at cryogenic temperatures (26 K).[1] The [Co4(CO)10(dppa-H+)]− complex [2] serves as precursor for the stepwise elimination of CO via collision induced dissociation (CID).The recorded spectra reveal several bands which shift by reduction of the CO coverage. This hints at an according change of coordination motif. DFT calculations help to elucidate the effects of the decreasing CO coverage on the structure and the spin multiplicity of the complex. We will discuss first data of a mixed CO-N2 complex [Co4(CO)8(N2)1(dppa-H+)]−.
[1] J. Mohrbach et al., J. Mol. Spectrosc., 2016 (accepted)
[2] C. Moreno et al., J.Organomet. Chem., 1993, 452, 185