紫外激光诱导C_60与M(CO)_6(M=Cr,Mo,W)的配位反应

研究了用紫外激光（355nm）诱导C60与金属羰基化合物M（CO）6（M＝Cr；Mo，W）的配位反应，合成了具有C4υ对称性的配位络合物（η2－C60）M（CO）5，并初步讨论了C60与M（CO）6反应的动力学过程．

紫外激光引发金属羰基化合物聚合苯乙炔

将苯乙炔单体加入紫外激光辐照的W(CO)_6-CCl_4溶液后,得到了聚苯乙炔,其分子量达9.36×10~4.本文研究了激光参数(能量、波长和辐照时间)以及W(CO)_6浓度对聚合的影响,并对W(CO)_6、Mo(CO)_6和Cr(CO)_6催化聚合苯乙炔的结果进行了对比.实验发现激光参数及催化剂对聚合有明显的影响.此外,紫外激光-W(CO)_6-CCl_4是一种新型高效催化体系,其寿命约为15小时.

紫外激光解离气相(η_6-C_6H_6)Cr(CO)_3分子的瞬态红外光谱研究

由于有机金属化合物的光催化活性,近年来有机金属化合物的光化学研究引起了人们极大的兴趣。本文用瞬态红外吸收光谱技术比较详细地研究了气相（η6-C6H6）Cr（CO）3分子的355nm和266nm激光解离过程。 紫外解离光源（355nm和266nm）由Nd:YAG激光器输出经三倍和四倍频而获得。激光的脉冲宽度约为5ns,重复频率为3Hz,通常使用的能量密度为2—5mJ/cm2。

UV LASER INITIATED STEREOSELECTIVE HOMOGENEOUS CATALYSIS POLYMERIZATION OF PHENYLACETYLENE

In this paper, the stereoselective homogeneous catalysis polymerization of phenylacetylene by using two kinds of catalysts W(CO)_5CH_3I and W(CO)_4I_2 produced from UV laser photolysis of W (CO)_6 in CH_3I, I_2—C_6H_6 and CHI_3—C_6H_6 respectively was studied. The effects of laser energy, laser irradiation time and lifetime of catalyst on the polymerization of phenylacetylene were discussed. The photoproducts of W (CO)_6 in CH_3I, I2—C_6H_6 and CHI_3—C_6I_6 were determined by IR spectra. The structures of polyphenylacetylene obtained by W (CO)_5CH_3I and W (CO)_4I_2 catalysts were characterized by IR spectra and ~1H NMR spectra.

A NEW METHOD ON THE CHEMICAL SYNTHESIS OF DOPED POLYPYRROLE INITIATED BY CuCl_2-C_2H_5OH SYSTEM

Our objectives were to develop a new chemical method for the polymerization of pyrrole. CuCl_2 dissolved in C_2H_5OH solvent is primarily used for the initiation polymerization of pyrrole. The polymers with different yield and conductivity were obtained by raring the initial concentration of Cu^(2+). The initial concentrations of Cu^(2+) varied from 1.2 × 10^(-4) mole to 6.48 × 10^(-3) mole Cu^(2+) with 2.16 × 10^(-2) mole pyrrole. The polypyrrole obtained was characterized with elemental analyzer, XPS, IR spectroscopy, Four-point probe and SEM.

EXPERIMENTAL DETERMINATION OFTHE SPIN-ROTATION COUPLING IN NaXe MOLECULES

The mean spin-rotation couplingγN of NaXe rnolecules is measmed by observing the sodium spin relaxation rate.It is in reasonable agreement with a recently presented theoretical expression.

紫外激光离解四氯化钛产生的钛原子的受激喇曼散射

紫外激光(259—300nm)离解四氯化钛产生了大量钛原子,它们主要处于钛原子的基态a^3F_2和亚稳态a^3F_(3,4)上。通过近共振跃迁对处于a^3F_(2,3,4)态上的钛原子进行泵浦,观测到一系列钛原子的受激喇曼散射和受激辐射,并对所有谱线进行了认证。钛原子的受激喇曼散射的脉宽和时间分辨谱表明,紫外激光离解四氯化钛产生钛原子的过程非常迅速,估计所需时间≤1ns。