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Cole-Filipiak NC, Troß J, Schrader P, McCaslin LM, Ramasesha K. Ultrafast infrared transient absorption spectroscopy of gas-phase Ni(CO) 4 photodissociation at 261 nm. J Chem Phys 2022; 156:144306. [DOI: 10.1063/5.0080844] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We employ ultrafast mid-infrared transient absorption spectroscopy to probe the rapid loss of carbonyl ligands from gas-phase nickel tetracarbonyl following ultraviolet photoexcitation at 261 nm. Here, nickel tetracarbonyl undergoes prompt dissociation to produce nickel tricarbonyl in a singlet excited state; this electronically excited tricarbonyl loses another CO group over tens of picoseconds. Our results also suggest the presence of a parallel, concerted dissociation mechanism to produce nickel dicarbonyl in a triplet excited state, which likely dissociates to nickel monocarbonyl. Mechanisms for the formation of these photoproducts in multiple electronic excited states are theoretically predicted with one-dimensional cuts through the potential energy surfaces and computation of spin–orbit coupling constants using equation of motion coupled cluster methods (EOM-CC) and coupled cluster theory with single and double excitations (CCSD). Bond dissociation energies are calculated with CCSD, and anharmonic frequencies of ground and excited state species are computed using density functional theory (DFT) and time-dependent density functional theory (TD-DFT).
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Affiliation(s)
- Neil C. Cole-Filipiak
- Combustion Research Facility, Sandia National Laboratories, Livermore, California 94550, USA
| | - Jan Troß
- Combustion Research Facility, Sandia National Laboratories, Livermore, California 94550, USA
| | - Paul Schrader
- Combustion Research Facility, Sandia National Laboratories, Livermore, California 94550, USA
| | - Laura M. McCaslin
- Combustion Research Facility, Sandia National Laboratories, Livermore, California 94550, USA
| | - Krupa Ramasesha
- Combustion Research Facility, Sandia National Laboratories, Livermore, California 94550, USA
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Potapov A, Asselin P. High-resolution jet spectroscopy of weakly bound binary complexes involving water. INT REV PHYS CHEM 2014. [DOI: 10.1080/0144235x.2014.932578] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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