Abstract
Abstract A novel dinuclear zinc(II) hexaazacryptate (Zn2L3+) has been synthesized as a phosphate capture molecule in aqueous solution (L = an alkoxide form of 4,16-(2-hydroxypropano)-1,4,7,13,16,19-hexaazacyclotetracosane). Potentiometric pH titration study disclosed a 1:1 phenyl phosphate complexation with Zn2L3+. The dissociation constant, Kd ( = [Zn2L3+][PhOPO32−]/[Zn2L3+–PhOPO32−]) is a small value of 6 × 10 − 7 M at 35 °C with I = 0.10 (NaNO3). The X-ray crystal analysis of the p-nitrophenyl phosphate complex with Zn2L3+ showed that the phosphate dianion binds as a bridging ligand to the two zinc(II) ions. The analogous 1:1 CH3COO−-bound Zn2L3+ complex was isolated and characterized by X-ray analysis.
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