Naphthalene spectral properties

Weber G, Farris FJ (1979) Synthesis and spectral properties of a hydrophobic fluorescent probe 6-propionyl-2-(dimethylamino)naphthalene. Biochemistry 18 3075-3078... 

Weber G. and Farris F. J. (1979) Synthesis and Spectral Properties of a Hydrophobic Fluorescent Probe 6-Propionyl-2-(Dimethylamino)naphthalene, Biochemistry 18, 3075-3078. 

The in, uv, mass, nmr, and C-nmr spectral data for naphthalene and other related hydrocarbons have been reported (7—11). Additional information regarding the properties of naphthalene has been pubUshed (3,6,12,13). 

The high sensitivity and specificity of photoluminescence analysis should make it possible to individualize clue materials, e.g., hair and glass, by the characteristic luminescence properties of trace constituents or impurities. Of particular significance are the newer techniques of analyzing the luminescence decay curves. For example, even when the absorption and luminescence spectra of the impurities are similar, it is possible to determine their concentrations if their luminescence lifetimes differ. The usefulness of this technique is illustrated in Figs. 1 and 2, where it is shown that the fluorescence spectra of naphthalene (N) and 1,6-dimethyl napthalene (DMN) are too similar for fluorescence spectral analysis of their mixtures (Fig. l) yet their relative concentrations can be readily determined from the fluorescence decay curve (Fig. 2). As indicated by the dashed curve in Fig. 2, the observed decay is the sum of exponential decays from a shorter lived component, i.e., DMN (lifetime 50 nsec) and a longer lived component, i.e., N (lifetime 100 nsec). St. John and Winefordner (j) have discussed this technique in general and Hoerman and co-workers (8,9) have been... 

Several heterocyclic derivatives that might exhibit aromatic properties have now been generated. Whether these systems that are formally analogous to benzene, cyclopentadienide ion, naphthalene, or anthracene but contain boron or an atom with a 3p or a 4p valence shell, are aromatic is uncertain. Ultraviolet and NMR spectral data that have been obtained for heteroaromatic species have been compared to analogous organic molecules. However, preliminary photoelectron spectral data obtained for arsabenzene (XXXVIIq) and arsaanthracene (XLIV) show that the... 

The initial RJRT PAH investigation involved eleven PAHs in the MSS from nonfiltered cigarettes (3240, 3244) [(see Table 1 in (3262)]. Naphthalene, anthracene, pyrene, fluoranthene, and B[fl]P, isolated in crystalline form, were characterized by UV absorption spectral data as well as by classical chemical means (mixture melting point, IR spectra, derivatization, and derivative properties). The other six PAHs were identified on the basis of agreement of their UV absorption spectra with those of authentic samples or with published UV data. 

Besides fluorescence spectroscopy, time-resolved spectroscopy can rely on the measurement of excited (singlet or triplet) state absorption. Similarly to ground-state absorption, the spectral and absorbance properties may be altered by CyD complexation and yield information about the behavior of the complex in the excited state in addition, the time dependence (formation and decay) of the excited state absorption yields information about the kinetics and dynamics of the system. This is illustrated by the behavior of the lowest triplet state of naphthalene as measured by nanosecond spectroscopy using a Q-switched Nd YAG laser at 266 nm for excitation [21]. The triplet-triplet absorption spectra were measured in neat solvents (water and ethanol) and in the presence of a- and -CyD (Fig. 10.3.3). The spectra in ethanol and H2O had the same absorption maximum, but the transition was considerably weaker and broadened in H2O. Both CyDs induced a red shift, and a-CyD additionally narrowed the main band considerably. Fig. 10.3.4 shows the effect of a-CD concentration on the time evolution of the triplet-triplet absorption at 416 nm in the microsecond range. Triplet decay was caused by O2 quenching a detailed kinetic analysis of the time dependence yielded two main components which could be assigned to the free guest and the 1 2 complex, in full... 

Pina J, Seixas de Melo J (2009) A comprehensive investigation of the electronic spectral and photophysical properties of conjugated naphthalene-thiophene oligomers. Phys Chem Chem Phys 11 8706-8713... 

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