| Autor: |
Adams, Harry, R. J. Elsegood, Mark, E. Fenton, David, L. Heath, Sarah, J. Ryan, Sara |
| Zdroj: |
Journal of the Chemical Society, Dalton Transactions; June 21, 1999, Vol. 1999 Issue: 12 p2031-2038, 8p |
| Abstrakt: |
The cyclocondensation of pyrrole-2,5-dicarbaldehyde and the amines N,N-bis(2-aminoethyl)- and N,N-bis(3-aminopropyl)-2-(aminomethyl)pyridine in the presence of silver(I) nitrate yielded homodinuclear bibracchial tetraimine Schiff base macrocyclic complexes [Ag2(L3)] 1 and [Ag2(H2L4)(ClO4)2]·CH3CN 2. In 1 the Ag · 4;· 4;· Ag separation is 2.748 Å. In 2 the silver atoms Ag(1) and Ag(2) are disordered over two sites with refined occupancies of 94.12 and 97.22% respectively. They are three-co-ordinate in the molecule having higher silver site occupancy and four-co-ordinate in that molecule having lower occupancy; the Ag · 4;· 4;· Ag separations are 5.881 and 7.224 Å respectively. There are protonated imine nitrogen atoms present in both molecules and the structure contains a disordered acetonitrile of crystallisation. |
| Databáze: |
Supplemental Index |
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