邻苯二甲酰肼的表面增强拉曼光谱——观察到正常拉曼光谱中禁阻的谱峰及对吸附构型的解释

THE SURFACE ENHANCED RAMAN SPECTRUM OF PHTHALIC HYDRAZIDE AND ITS INTERPRETATION FOR THE ADSORBED CONFIGURATION

测定了邻苯二甲酰肼粉末样品在400～2800cm^(-1)范围内的激光拉曼光谱和红外光谱。比较谱图很容易看出呈现互补关系,该化合物固体状态应具有对称中心。邻苯二甲酰肼碱性溶液的表面增强拉曼谱图上出现了粉末拉曼谱上没有的1374cm^(-1)处很强的峰和其他峰。这可解释为:在固态时,邻苯二甲酰肼两个分子间通过氢键形成二聚体,属C_(2h)点群,只有g类振动表现出拉曼活性;而在溶液中,二聚体破坏掉,在荷正电银电极作用下,两个氮原子上的氢脱掉,分子通过两个氮原子吸附在电极上,呈1.4—二酚式结构,属C_(2v)点群,所有振动都是拉曼活性的,表现出很多固态样品拉曼谱上禁阻的峰。

It is interpretated that phthalic hydrazide in Solid is dimerized through the hydrogen bonding and is of symmetry C_(2v). Its Raman and infrared spectra demonstrate the exclusion principle,In the vicinity of the electrode, Phthalic hydrazide is adsorbed to the electrode surface through two nitrogen atoms and is of the 1,4-diphenolic formwith symm etry group C_(2v).