摘要
在Hartree-Fock和二级Moller-Plesset微扰理论MP2水平,用6-31G对乙酰胆碱进行了从头计算研究,发现了旁式和反式两种稳定构象.经零点振动能校正后,在Hartree-Fock级别旁式较反式稳定0.24kJ·mol^(-1);而在MP2级别,反式较旁式稳定2.07kJ·mol^(-1).谐振动频率在HF/6-31G水平计算.还给出了两种构象的MP2分子静电势图.
All-electron ab initio calculations of aretylcholine (Ach) ion have been carriedout at the Hartree-Fock and the second order Moller-Plesset perturbation theory MP2levels using 6-31G* basis set. Two stable conformations of gauche and trans forms of Achhave been found. It was found that after zero-point vibrational energy ZPVE corrections,at the Hartree-Fock level the gauche form is 0.24 kJ·mol-1 more stable than the trans, butat MP2 level the trans is 2.07kJ·mol-1 more stable than the gauche. The Harmonic vibrational frequencies have been computed at HF/6-31G* level. The Molecular ElectrostaticPotentials, MEP contour maps of two conformations of the Ach based on MP2 wavefunctions are shown in this article.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
1996年第6期518-522,共5页
Acta Physico-Chimica Sinica
基金
国家自然科学基金
贵州省科委
教委自然科学基金
关键词
乙酰胆碱
神经递质
MP2
构象
分子静电势
Acetylcholine, Ab initio, MP2, Conformation, Molecular electrostatic potential