Photochemistry of transition-metal phthalocyanines. Analysis of the photochemical and photophysical properties of the acido(phthalocyaninato)rhodium(III) complexes

Journal Article · Fri Apr 01 00:00:00 EST 1983 · Inorg. Chem.; (United States)

DOI:https://doi.org/10.1021/ic00151a021· OSTI ID:5318914

Ferraudi, G; Muralidharan, S

The ultraviolet photochemistry of the rhodium(II) phthalocyanines Rh(ph)(CH/sub 3/OH)X with X = Cl/sup -/, Br/sup -/, and I/sup -/ was investigated at different wavelengths. The same action spectrum for the photoinduced hydrogen abstraction was obtained for the three compounds. The photonic energy of the excitation is degraded in part by emission at short wavelengths, e.g. lambda/sub max/ approx. = 420 nm. Such a violet emission, observed with phthalocyanines of Al(III), Rh(III), Co(III), and Ru(II), has been attributed to the relaxation of an upper /sup 3/par. deltapar. delta* excited state. The emissions spectra at 77 K exhibited vibronic components with a separation between successive peaks ..delta nu.. approx. = 1.3 x 10/sup 3/ cm/sup -1/. A comparison between the excitation and action spectra shows the difference in the paths that populate the reactive npar. delta* and upper emissive par. deltapar. delta* states. An investigation of the time dependence of the upper /sup 3/par. deltapar. delta* emission and lowest /sup 3/par. deltapar. delta* absorptions reveals the participation of triplet sublevels in the degradation of the excitation energy. The relationship between photoemissive and photoreactive states is discussed.

• Research Organization: Univ. of Notre Dame, IN
• OSTI ID: 5318914
• Journal Information: Inorg. Chem.; (United States), Vol. 22:9
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ALUMINIUM COMPLEXES
EMISSION SPECTRA
PHOTOCHEMISTRY
COBALT COMPLEXES
RHODIUM COMPLEXES
RUTHENIUM COMPLEXES
TRANSITION ELEMENT COMPLEXES
PHTHALOCYANINES
CHEMISTRY
COMPLEXES
DYES
HETEROCYCLIC COMPOUNDS
ORGANIC COMPOUNDS
SPECTRA
400201* - Chemical & Physicochemical Properties