The role of transition metal ions in hydrogen bonded networks: A density functional molecular orbital theory study

被引:17
作者
McGrady, JE [1 ]
Mingos, DMP [1 ]
机构
[1] UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,DEPT CHEM,LONDON SW7 2AY,ENGLAND
来源
JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 2 | 1996年 / 03期
关键词
D O I
10.1039/p29960000355
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
The capacity of biureto- (C2N3O2H32-) and dithiobiureto- (C2N3S2H41-) complexes of nickel, L(2)Ni(bt) and L(2)Ni(dbt) [L(2) = (CO)(2), (PH3)(2), (NH3)(2), acac(-),dagger (Cl-)(2), (CN-)(2)] to form hydrogen bonds with complementary probe molecules has been studied using density functional molecular orbital theory. The charge on the trans ligands, L, is found to be the dominant factor in determining the strength of the hydrogen bonding. The pi donor and acceptor properties of the ligands are relatively unimportant. Increasing the negative charge on the ligands enhances hydrogen bonding in biureto complexes, where there is an excess of proton acceptor groups, In dithiobiureto complexes, where proton donor groups are in excess, the influence of the trans ligands is much smaller, and in the opposite direction; greater negative charge reducing the strength of the hydrogen bonds, These results suggest an approximately two-fold greater susceptibility of the proton acceptor groups to changes at the metal centre.
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页码:355 / 358
页数:4
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