信阳师范学院学报(自然科学版)
信暘師範學院學報(自然科學版)
신양사범학원학보(자연과학판)
JOURNAL OF XINYANG NORMAL UNIVERSITY(NATURAL SCIENCE EDITION)
2014年
3期
394-397
,共4页
HF%铑%催化剂
HF%銠%催化劑
HF%로%최화제
HF%Rh%catalyst
采用HF从头算,有效核势能近似(ECP)方法,在LANL2DZ赝势基组水平下,研究了铑配合物系列催化剂,以及其同系物、同分异构体的几何结构和能量;同时,利用AIM2000电子密度拓扑软件,对每种配合物的中心Rh原子电子密度和主要原子间键鞍点电子密度的Laplacian量▽2ρ( r)进行了分析比较。研究结果表明,邻-乙酸-吡啶铑阳离子催化剂的Rh-O间共价作用最弱,并且由于其具有的不对称螯合物结构,使得Rh-O键易于断开,对于催化反应的决速步骤来说,该催化剂是最有利于降低活化能的。
採用HF從頭算,有效覈勢能近似(ECP)方法,在LANL2DZ贗勢基組水平下,研究瞭銠配閤物繫列催化劑,以及其同繫物、同分異構體的幾何結構和能量;同時,利用AIM2000電子密度拓撲軟件,對每種配閤物的中心Rh原子電子密度和主要原子間鍵鞍點電子密度的Laplacian量▽2ρ( r)進行瞭分析比較。研究結果錶明,鄰-乙痠-吡啶銠暘離子催化劑的Rh-O間共價作用最弱,併且由于其具有的不對稱螯閤物結構,使得Rh-O鍵易于斷開,對于催化反應的決速步驟來說,該催化劑是最有利于降低活化能的。
채용HF종두산,유효핵세능근사(ECP)방법,재LANL2DZ안세기조수평하,연구료로배합물계렬최화제,이급기동계물、동분이구체적궤하결구화능량;동시,이용AIM2000전자밀도탁복연건,대매충배합물적중심Rh원자전자밀도화주요원자간건안점전자밀도적Laplacian량▽2ρ( r)진행료분석비교。연구결과표명,린-을산-필정로양리자최화제적Rh-O간공개작용최약,병차유우기구유적불대칭오합물결구,사득Rh-O건역우단개,대우최화반응적결속보취래설,해최화제시최유리우강저활화능적。
Pyridine carbonylic acid Rh catalyst ( [ MRh( CO) 2 ] +, M:pyridine carbonylic acid complexes ) and its homolog, isomer were studied by using the ab initio method with the effective core potential ( ECP) approximation in HF/LANL2DZ level.From the view of topological analysis of the electronic density , electronic density and Laplacian of all catalysts’ critical points were studied.The results indicated that the center metal (Rh) of [MRh(CO)2] +catalyst and its homolog and isomer haven ’ t more effective charge when they employed asymmetric chelate ligand .The o-acetic acid-pyridine-Rh catalyst has the lowest reaction energy barrier and the weakest Rh-O covalence orbitals interreaction which tends to break .