Sexidentate co-ordination of the pendant-arm macrocycle 6,13-dimethyl-1,4,8,11-tetraazacyclotetradecane-6,13-diamine (L1) to zinc(II). Crystal structure of [ZnL1][ClO4]2·H2O
- 1 January 1991
- journal article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 5,p. 1167-1170
- https://doi.org/10.1039/dt9910001167
Abstract
The pendant-arm macrocycle 6,13-dimethyl-1,4,8,11-tetraazacyclotetradecane-6,13-diamine (L1) co-ordinates as a sexidentate ligand to zinc(II) in neutral aqueous solution. The complex [ZnL1][ClO4]2·H2O crystallises in the monoclinic space group P21/c, a= 9.488(4), b= 14.736(9), c= 16.037(4)Å, β= 97.95(3)° and Z= 4. The Zn–N bond lengths in [ZnL1]2+ are, on average, the shortest known for a hexaaminezinc(II) complex. The stability constant for formation of [ZnL1]2+ was determined to be log K 15.0 ± 0.1, from potentiometric titrations. Five of the six successive protonation constants for the hexaamine L1 were measured similarly and values pKa 2.9, 5.5, 6.3, 9.9 and 11.0 found.Keywords
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