Development of Fourier Transform Ultraviolet. Visible. Near-Infrared Raman Spectroscopy and its Application to Structural Chemistry

研制了1064 nm激发的傅里叶变换（FT）拉曼光谱仪。研究了导电高分子和光合色素的共振拉曼光谱。(1)1064 nm激发的FT-拉曼光谱仪的构建FT-拉曼光谱仪主要由带有InGaAs检测器的FT-NIR分光光度计（JEOL JIR-5500）、连续波Nd：YAG激光器（CVI YAGMAX C-92）、用于收集散射光的光学器件、用于抑制瑞利散射的滤光片等组成。(2)在1064 nm激发下，获得了掺碘、钠的反式聚乙炔（PA）薄膜和掺硫酸、钠的聚对苯撑乙烯（PPV）薄膜的共振拉曼光谱。随着Na掺杂PA中Na含量的增加，观察到两种光谱变化，对应于电导率的增加和泡利磁化率的出现。根据适当低聚物的二价阴离子的数据，将Na掺杂PPV的拉曼光谱归因于负双极化子。(3)光合色素获得了球形红细菌（Rhodobacter sphaeroides）蓝绿突变株的细菌叶绿素a（BChl a）在不同固体膜和色素体中的1064 nm激发拉曼光谱。根据C=O伸缩波数和CC伸缩波数这两个表征中心Mg配位数的标记带，讨论了Bchla分子的相互作用和排列。

Fourier transform (FT) Raman spectrophotometer with 1064 nm excitation is constructed. Resonance Raman spectra of conducting polymers and photosynthetic pigments are studied.(1) Construction of 1064 nm excited FT-Raman spectrophotometerAn FT-Raman spectrophotometer consists mainly of FT-NIR spectrophotometer (JEOL JIR-5500) with an InGaAs detector, continuous-wave Nd : YAG laser (CVI YAGMAX C-92), optics for collecting scattered light, filters for rejection of Rayleigh scattering, etc.(2) Conducting polymersResonance Raman spectra of trans-polyacetylene (PA) films doped with iodine or Na and poly (para-phenylenevinylene) (PPV) films doped with H_2SO_4 or Na are obtained with 1064 nm excitation. As Na content of Na-doped PA increases, two spectral changes corresponding to the increase of electrical conductivity and the appearance of Pauli susceptibility are observed. Raman spectra of Na-doped PPV are ascribed to negative bipolarons on the basis of the data of the divalent anion of an appropriate oligomer.(3) Photosynthetic pigmentsThe 1064 nm excited Raman spectra of bacteriochlorophyll a (BChl a) in various solid films and in chromatophores from a blue-green mutant of Rhodobacter sphaeroides are obtained. Molecular interactions and arrangements of Bchla are discussed on the basis of the C=O stretching wavenumber and CC stretches which are marker bands of the coordination number of central Mg.