EXTERNAL MAGNETIC-FIELD AND MAGNETIC ISOTOPE EFFECTS UPON THE LIFETIMES OF BIRADICALS DERIVED FROM BENZOPHENONE DERIVATIVES

被引：11

作者：

NAKAGAKI, R ^{[1
]}

TAKAHIRA, O ^{[1
]}

HIRUTA, K ^{[1
]}

机构：

[1] INST MOLEC SCI,DEPT ELECTR STRUCT,OKAZAKI,AICHI 444,JAPAN

来源：

CHEMICAL PHYSICS LETTERS | 1995年 / 233卷 / 1-2期

关键词：

D O I：

10.1016/0009-2614(94)01438-2

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：

The decay profile of several isotope-labelled biradicals containing a benzophenone ketyl and a hydrogen-donor radical has been examined by means of nanosecond laser flash photolysis in the presence of an external magnetic field. Noticeable magnetic isotope effects are observed on the decay kinetics: deuteration of the particular C-H bond in the hydrogen donor results in retardation of the biradical recombination, whereas C-13 substitution of the benzylic carbon in the hydrogen donor shortens the biradical decay time. The observed results can be interpreted in terms of the relaxation mechanism and molecular motion.

引用

页码：41 / 46

页数：6

共 35 条

[1] THE LASER-DROP METHOD - A NEW APPROACH TO INDUCE MULTIPLE-PHOTON CHEMISTRY WITH PULSED LASERS - EXAMPLES INVOLVING REACTIONS OF DIPHENYLMETHYL AND CUMYLOXYL RADICALS [J].

BANKS, JT ;

SCAIANO, JC .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1993, 115 (14) :6409-6413

[2]

BERNDT A, 1977, LANDOLTBORNSTEIN G B, V9

[3]

Brocklehurst B., 1985, INT REV PHYS CHEM, V4, P279

[4]

BUCHACHENKO AL, 1984, PROGR REACTION KINET, V13, P163

[5]

DEKANTER FJJ, 1977, MOL PHYS, V34, P334

[6] DYNAMICS OF FLEXIBLE TRIPLET BIRADICALS [J].

DOUBLEDAY, C ;

TURRO, NJ ;

WANG, JF .

ACCOUNTS OF CHEMICAL RESEARCH, 1989, 22 (06) :199-205

[7] A PARAMAGNETIC RESONANCE STUDY OF HINDERED DIARYLMETHYL RADICALS AND RELATED COMPOUNDS .I. ANALYSIS OF SPECTRA [J].

FALLE, HR ;

ADAM, FC .

CANADIAN JOURNAL OF CHEMISTRY, 1966, 44 (12) :1387-&

[8] THEORETICAL-STUDY OF RELAXATION MECHANISM IN MAGNETIC-FIELD EFFECTS ON CHEMICAL-REACTIONS [J].

HAYASHI, H ;

NAGAKURA, S .

BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, 1984, 57 (02) :322-328

[9] MAGNETIC-FIELD, ADDITIVE AND STRUCTURAL EFFECTS ON THE DECAY KINETICS OF MICELLIZED TRIPLET RADICAL PAIRS - ROLE OF DIFFUSION, SPIN-ORBIT-COUPLING AND PARAMAGNETIC RELAXATION [J].

LEVIN, PP ;

KUZMIN, VA .

CHEMICAL PHYSICS, 1992, 162 (01) :79-93

[10] MAGNETIC ISOTOPE EFFECTS ON THE DECAY KINETICS OF MICELLIZED TRIPLET KETYL PHENOXYL RADICAL PAIRS - ROLE OF HYPERFINE, EXCHANGE, AND DIPOLE DIPOLE INTERACTIONS [J].

LEVIN, PP ;

SHAFIROVICH, VY ;

KUZMIN, VA .

JOURNAL OF PHYSICAL CHEMISTRY, 1992, 96 (24) :10044-10048

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