Coordination Chemistry of Nickel(Ⅱ) Macrocyclic Tetraamine Complexes

• Main Authors: Chen Chien-An, 陳健安
• Other Authors: Chung Chung-Sun
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/28132283768066372980

碩士 === 國立清華大學 === 化學系 === 89 === The macrocyclic tetraamine ligands were synthesized by using of direct organic condensation reaction and then subjected to react with nickel(II) ion and followed by reduction to form C- diastereoisomeric complexes. These diastereoisomeric complexes were separated and ligand configuration and conformation were assigned on the basis of chemical and spectroscopical method. In order to investigate the effect of the structural variation of the nickel(II) macrocyclic tetraamine complexes upon Ni-N bonds has been examined with FTIR. The kinetics of ternary complex formation between [α-Ni(tet-b)](ClO4)2 and ethylenediamine were studied at 25±0.1℃ and μ=0.1 mol dm-3 (NaClO4) over a pH range of 7.38~8.37, covering an ethylenediamine concentration range of (2.00~10.00)×10-3 mol dm-3. The rate-determining step in the en path is ring closure whereas the Hen+ is the initial bond formation. The decelerating effects on the rate constant values of the complex formation path are due to : (1) steric hindrance; (2) the size of ring; (3)ICB effect.