Excited-state annihilation process involving a cyclometalated platinum(II) complex

Journal Article · Wed May 29 00:00:00 EDT 1991 · Inorganic Chemistry; (United States)

DOI:https://doi.org/10.1021/ic00011a005· OSTI ID:6089048

Maestri, M; Sandrini, D ^[1]; von Zelewsky, A; Deuschel-Cornioley, C ^[2]

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1. Univ. of Bologna (Italy)
2. Univ. of Fribourg (Switzerland)

The Pt(tpy)(ppz) complex exhibits strong luminescence with a relatively long excited-state lifetime (15.3 {mu}s) in deaerated acetonitrile solution, at room temperature and at low excitation intensity, and can be easily involved in excited-state quenching processes. The {sub 3}CT excited state is, in fact, quenched (1) by oxygen (k{sub q} {congruent} 10{sup 9} M{sup {minus}1} s{sup {minus}1}), (2) by the ground-state complex (k{sub q} = 5.7 {times} 10{sup 7} M{sup {minus}1} s{sup {minus}1}), and (3) by another {sup 3}CT excited state in an annihilation process, which is practically diffusion controlled (k{sub 3} > 6 {times} 10{sup 9} M{sup {minus}1} s{sup {minus}1}). The ground-state quenching and the annihilation process most probably occur via an excimer formation mechanism. 46 refs., 3 figs.

• OSTI ID: 6089048
• Journal Information: Inorganic Chemistry; (United States), Vol. 30:11; ISSN 0020-1669
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
37 INORGANIC
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PHYSICAL AND ANALYTICAL CHEMISTRY
PLATINUM COMPLEXES
LUMINESCENCE
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ACETONITRILE
CHEMICAL REACTION KINETICS
ELECTRON TRANSFER
EXCITED STATES
EXPERIMENTAL DATA
LASER RADIATION
PHOTOLYSIS
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CHEMICAL REACTIONS
COMPLEXES
DATA
DECOMPOSITION
ELECTROMAGNETIC RADIATION
ENERGY LEVELS
HETEROCYCLIC COMPOUNDS
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NITRILES
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
RADIATIONS
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TRANSITION ELEMENT COMPLEXES
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