SPECTRAL SHIFTS AND BROADENING OF FLUORESCENCE OF ANTHRACENE AND TETRACENE IN SEVERAL HOST CRYSTALS AT HIGH PRESSURES

被引:19
作者
JONES, PF
机构
[1] Aerospace Corporation, El Segundo, CA
[2] Department of Chemistry, University of California, Los Angeles, CA
[3] Department of Chemistry, University of California
关键词
D O I
10.1063/1.1668238
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 fluorescence spectra of anthracene in biphenyl, -4-terphenyl, naphthalene, and phenanthrene and those of tetracene in -4>-terphenyl, naphthalene, phenanthrene, and anthracene were measured at pressures as great as 50 kbar. The pressure effects on the spectra of the guests are generally analogous to the pressure effects in solution or the gas phase. Due to the increased dispersion interaction between these nonpolar molecules upon compression, the energies of the electronic transitions are shifted toward the red (lower energy), and the spectral bands are broadened, while the integrated intensity remains approximately constant. As the pressure is released, the fluorescence spectra return to those obtained before compression. The spectral shifts with pressure are satisfactorily interpreted in terms of a second-order perturbation theory using a dipole-dipole approximation. For three of the eight guest-host combinations, the fluorescence spectra above 35 kbar were considerably broader than expected. The similar broadening observed for the pure host crystals suggests that mixed excimers are produced at high pressures. On the basis of the present data, however, it is not possible to give an unambiguous explanation of the extensive broadening.
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页码:5448 / &
相关论文
共 35 条
[1]   ULTRA-VIOLET POLARIZATION RATIOS IN ANTHRACENE-TETRACENE MIXED CRYSTALS [J].
AKON, CD ;
CRAIG, DP .
TRANSACTIONS OF THE FARADAY SOCIETY, 1967, 63 (529P) :56-&
[2]  
BASU S, 1964, ADVANCES QUANTUM CHE, V1, P145
[3]   DIPOLAR NATURE OF MOLECULAR COMPLEXES FORMED IN EXCITED STATE [J].
BEENS, H ;
KNIBBE, H ;
WELLER, A .
JOURNAL OF CHEMICAL PHYSICS, 1967, 47 (03) :1183-&
[4]   EXCIMERS AND EXCIPLEXES [J].
BIRKS, JB .
NATURE, 1967, 214 (5094) :1187-&
[5]  
Bridgman P. W., 1949, P AM ACAD ARTS SCI, V77, P129
[6]  
Bridgman P.W., 1948, P AM ACAD ARTS SCI, V76, P71
[7]  
BULLOT J, 1965, CR HEBD ACAD SCI, V260, P4721
[8]   MIXED EXCIMER FLUORESCENCE IMPORTANCE OF CHARGE-TRANSFER INTERACTION [J].
CHANDROSS, EA ;
FERGUSON, I .
JOURNAL OF CHEMICAL PHYSICS, 1967, 47 (08) :2557-+
[9]   TRIPLET-TRIPLET SPECTRA OF AROMATIC MOLECULES IN MIXED CRYSTALS [J].
CRAIG, DP ;
FISCHER, G .
TRANSACTIONS OF THE FARADAY SOCIETY, 1967, 63 (531P) :530-&
[10]   ON MULTIPOLE INTERACTION METHODS IN EXCITON THEORY [J].
CRAIG, DP ;
THIRUNAMACHANDRAN, T .
PROCEEDINGS OF THE PHYSICAL SOCIETY OF LONDON, 1964, 84 (5415) :781-&