Unusual dynamic relaxation of triplet-excited meso-phenyl-substituted porphyrins and their chemical dimers at room temperatures

被引：55

作者：

Knyukshto, V ^{[1
]}

Zenkevich, E ^{[1
]}

Sagun, E ^{[1
]}

Shulga, A ^{[1
]}

Bachilo, S ^{[1
]}

机构：

[1] Byelarussian Acad Sci, Inst Mol & Atom Phys, Minsk 220072, BELARUS

来源：

CHEMICAL PHYSICS LETTERS | 1998年 / 297卷 / 1-2期

关键词：

D O I：

10.1016/S0009-2614(98)01096-3

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

It has been found that for mono- and di-meso-phenyl-substituted octaethylporphyrin (OEPs), etioporphyrins, corresponding Zn complexes and OEP chemical dimers (with a meso-phenyl spacer) a drastic shortening of triplet lifetimes from a ms to mu s timescale in deaerated toluene solutions at 295 K takes place without any changes of the spectral-kinetic parameters of the S-0 and S-1 states. The observed effects are connected with torsion librations of the phenyl ring around a single C-C bond in sterically encumbered porphyrins leading to non-planar dynamic distorted conformations in excited T-1 states accompanied by an enhancement of the T-1-state nonradiative deactivation pathways. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：97 / 108

页数：12

共 34 条

[1] BETA-CAROTENE TRIPLET-STATE ABSORPTION IN THE NEAR-IR RANGE [J].

BACHILO, SM .

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, 1995, 91 (02) :111-115

[2] Multiconformational surfaces in porphyrins: Previews into excited-state landscapes [J].

Barkigia, KM ;

Nurco, DJ ;

Renner, MW ;

Melamed, D ;

Smith, KM ;

Fajer, J .

JOURNAL OF PHYSICAL CHEMISTRY B, 1998, 102 (01) :322-326

[3]

CHACHATY C, 1982, J AM CHEM SOC, V104, P7442

[4] PHOTOPHYSICAL STUDIES OF SUBSTITUTED PORPHYRINS [J].

CHARLESWORTH, P ;

TRUSCOTT, TG ;

KESSEL, D ;

MEDFORTH, CJ ;

SMITH, KM .

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS, 1994, 90 (08) :1073-1076

[5] Complexation and interchromophoric interactions in self-organized porphyrin and chlorin triads [J].

Chernook, AV ;

Shulga, AM ;

Zenkevich, EI ;

Rempel, U ;

vonBorczyskowski, C .

JOURNAL OF PHYSICAL CHEMISTRY, 1996, 100 (05) :1918-1926

[6] SULFITE REDUCTASE STRUCTURE AT 1.6 ANGSTROM - EVOLUTION AND CATALYSIS FOR REDUCTION OF INORGANIC ANIONS [J].

CRANE, BR ;

SIEGEL, LM ;

GETZOFF, ED .

SCIENCE, 1995, 270 (5233) :59-67

[7] STERIC EFFECTS ON ATROPISOMERISM IN TETRAARYLPORPHYRINS [J].

CROSSLEY, MJ ;

FIELD, LD ;

FORSTER, AJ ;

HARDING, MM ;

STERNHELL, S .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1987, 109 (02) :341-348

[8] THE PHOTOSYNTHETIC REACTION CENTER FROM THE PURPLE BACTERIUM RHODOPSEUDOMONAS-VIRIDIS [J].

DEISENHOFER, J ;

MICHEL, H .

SCIENCE, 1989, 245 (4925) :1463-1473

[9]

EGOROVA GD, 1980, OPT SPEKTROSK+, V48, P1101

[10]

FORMAN A, 1989, ISRAEL J CHEM, V29, P57

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