A pyrazole based ditopic ligand (PzOAP), prepared by the reaction between 5-
methylpyrazole-3-carbohydrazide and methyl ester of imino picolinic acid, reacts with Cu
(NO3) 2· 6H2O to form a self-assembled, ferromagnetically coupled, alkoxide bridged
tetranuclear homoleptic Cu (II) square grid-complex [Cu4 (PzOAP) 4 (NO3) 2](NO3) 2· 4H2O
(1) with a central Cu4 [µ-O4] core, involving four ligand molecules. In the Cu4 [µ-O4] core,
out of four copper centers, two copper centers are penta-coordinated and the remaining two …

A pyrimidyl-pyrazole based ditopic ligand N-[amino (pyridin-2-yl) methylidene]-1-(4, 6-
dimethylpyrimidin-2-yl)-5-methyl-1H-pyrazole-3-carbohydrazonic acid, PymPzOAP prepared
by the reaction between pyrimidyl pyrazole 3-carbohydrazide and methyl ester of
iminopicolinic acid, reacts with Cu (NO3) 2· 6H2O to form a self-assembled,
ferromagnetically coupled alkoxide bridged tetranuclear homoleptic Cu (II) 4 [2× 2] grid
complex [Cu4 (PymPzOAP) 4](NO3) 4 (1). The complex has a central Cu4 (μ-OR) 4 core …