SYNTHESIS AND CRYSTAL STRUCTURE OF [Zn(CH₃COO)₂L₂]·2CH₃OH (L = 3-AMINO-5-PHENYLPYRAZOLE)

Z. K. Jacimovic¹, G. A. Bogdanovic² , Z. D. Tomic², E. Z. Iveges³, V. M. Leovac³

¹Faculty of Metallurgy and Technology, University of Montenegro,81000 Podgorica, Yugoslavia;
²Institute of Nuclear Sciences "Vinca", 11001 Belgrade, Yugoslavia;
³Institute of Chemistry, Faculty of Sciences, University of Novi Sad, 21000 Novi Sad, Yugoslavia

Keywords: Zinc(II)-complex; Ligands: acetato and 3-amino-5-phenylpyrazole; crystal structure

Monocrystals of the titled complex were obtained by crystallization from methanolic solution of Zn(CH₃COO)₂ · 2H₂O and 3-amino-5-phenylpyrazole (L), (mole ratio 1:2).

The compound crystallizes with two solvent methanol molecule in the triclinic space group, P-1, with a=9.377(1) A, b=9.940(1) A, c=15.344(1) A, a =93.06(1)^o, b =98.17(1)^o, g =98.23(1)^o, V=1397.2(2) A³, Z=2, D_c=1.33 g/cm³, l(MoK)=0.71073 A.

The crystal structure was solved by Patterson and difference electron density synthesis and refined by full-matrix least-squares calculations to a final R=4.54 and Rw=5.62 based on the 3753 observed reflections (I>3 s(I)).

Two pyridine nitrogen atoms from pyrazole derivative and two oxygens from acetato groups are coordinated to Zn in a distorted tetrahedral arrangement. The phenyl and amino- pyrazol rings in A and B ligands are both planar within the experimental accuracy. Dihedral angle between phenyl and amino-pyrazol planes are 5.6(2)° in ligand A and 27.4(2)° in ligand B.