First zinc complex of an amino acid pyrazole conjugate: synthesis and crystal structure of {Zn[3-(Ac-Phe)-5-methyl-pyrazole]2}2(ClO4)4

The zinc(II) complex, of the dimeric {Zn[3-(Ac-Phe)-5-methyl-pyrazole]2}2(ClO4)4 (5) was obtained by the reaction of the amino acid–pyrazole conjugate, 3-(Ac-Phe)-5-methyl-pyrazole (4) and Zn(ClO4)2. An acetone solvate of this complex was analyzed by single crystal X-ray crystallography, which establishes the dimeric nature of the complex with a large Zn–Zn separation of 5.551(6) Å and exbihiting coordination to the distorted trigonal bipyramidal zinc centers through the amino acid CO and the pyrazole N.