Universität zu Köln

Nagamori, Keigo, Haze, Misato, Nakata, Hiroyuki, Zingsheim, Oliver, Yamasaki, Katsuyoshi ORCID: 0000-0002-0823-9636 and Kohguchi, Hiroshi ORCID: 0000-0001-9684-1258 (2022). Generation of Highly Vibrationally Excited CO in Sequential Photodissociation of Iron Carbonyl Complexes. J. Phys. Chem. A, 126 (2). S. 306 - 314. WASHINGTON: AMER CHEMICAL SOC. ISSN 1520-5215

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Abstract

Ultraviolet photochemistry of iron pentacarbonyl, Fe(CO)(5), was investigated with resonantly enhanced multiphoton ionization (REMPI) spectroscopy and ion imaging. The REMPI spectrum of CO photofragments, generated by ultraviolet irradiation of Fe(CO)s, showed the generation in the highly vibrationally excited states with v = 11-15. Analysis of the band intensities observed in the 213-235 nm region indicated that the high-v CO generation was maximized at around 220 nm. Generation yields of the coordinatively unsaturated intermediates, Fe(CO)(n=1-4), were measured as a function of the photolysis wavelength using a nonresonant detection scheme. The yield spectrum of FeCO was correlated with that of the high-v CO fragments, suggesting high-v CO generation in the photo- dissociation of FeCO. The density functional theory calculations of the excited states of FeCO showed an intense photoabsorption to the metal-centered state near 220 nm. The theoretical results were consistent with the interpretation of FeCO + by -> Fe + high-v CO, which was experimentally indicated. The momentum distribution obtained from the velocity distributions of Fe, Fe(CO)(4), and CO fragments further supported that Fe is the counter-product of the high-v CO fragment. The present results provided selective observation of the photochemistry of the unsaturated iron carbonyl complexes, which has not been well elucidated in laser-based experiments because of the uncontrollable sequential photodissociation producing mixed Fe(CO)(n) intermediates.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Nagamori, Keigo UNSPECIFIED UNSPECIFIED UNSPECIFIED Haze, Misato UNSPECIFIED UNSPECIFIED UNSPECIFIED Nakata, Hiroyuki UNSPECIFIED UNSPECIFIED UNSPECIFIED Zingsheim, Oliver UNSPECIFIED UNSPECIFIED UNSPECIFIED Yamasaki, Katsuyoshi UNSPECIFIED orcid.org/0000-0002-0823-9636 UNSPECIFIED Kohguchi, Hiroshi UNSPECIFIED orcid.org/0000-0001-9684-1258 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-668354
DOI:	10.1021/acs.jpca.1c09922
Journal or Publication Title:	J. Phys. Chem. A
Volume:	126
Number:	2
Page Range:	S. 306 - 314
Date:	2022
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	1520-5215
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language TRANSITION-METAL CARBONYLS; DIODE-LASER SPECTROSCOPY; MULTIPHOTON IONIZATION; ULTRAVIOLET PHOTOLYSIS; FEMTOSECOND DYNAMICS; AB-INITIO; FE(CO)5; DISSOCIATION; PHOTOCHEMISTRY; ENERGETICS Multiple languages Chemistry, Physical; Physics, Atomic, Molecular & Chemical Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/66835