Excited-state transient of vanadyl uroporphyrin I detected by resonance Raman spectroscopy

Journal Article · Thu Feb 22 04:00:00 EST 1990 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100367a044· OSTI ID:6663270

Alden, R G; Sparks, L D; Ondrias, M R ^[1]; Crawford, B A; Shelnutt, J A ^[2]

---

1. Univ. of New Mexico, Albuquerque (USA)
2. Sandia National Labs., Albuquerque, NM (USA)

Transient Raman spectroscopy has been used to investigate excited states of vanadyl uroporphyrin I (VOUroP) in both monomeric and dimeric forms. Uroporphyrins are water-soluble porphyrins with propionic and acetic acid groups substituted at the {beta}-pyrrole carbon positions. Monomeric VOUroP in aqueous solution is known to be six-coordinate with a ligand trans to the oxo ligand. Upon dimerization, the sixth ligand site is inaccessible, and a five-coordinate species is observed. At high laser fluence, an excited-state transient is formed in the monomeric species. Raman spectra of this species are most consistent with an {sup 2}A{sub 1u} (a{sub 1u}({pi}) {yields} d{sub xy}) charge-transfer state. In contrast, dimeric VOUroP shows little evidence of an excited state in the transient Raman spectra during a 10-ns laser pulse.

• OSTI ID: 6663270
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:4; ISSN JPCHA; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
550200 -- Biochemistry
59 BASIC BIOLOGICAL SCIENCES
CALCULATION METHODS
CARBOXYLIC ACIDS
COMPLEXES
DATA
DATA ANALYSIS
ELECTRON TRANSFER
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
INFORMATION
LASER SPECTROSCOPY
MEASURING INSTRUMENTS
MEASURING METHODS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PORPHYRINS
RAMAN SPECTROSCOPY
SPECTROSCOPY
TRANSITION ELEMENT COMPLEXES
VANADIUM COMPLEXES