Solvent induced reactivity of 3,5-dimethylpyrazole towards zinc (II) carboxylates.
The reactions of 3,5-dimethylpyrazole with zinc(II)acetate dihydrate and varieties of aromatic carboxylic acids led to formation of mono-nuclear zinc complexes of composition [Zn(HDMP)2(RCO2)2] (R = C6H5, p-CH3-C6H4, p-NO2-C6H4 etc. HDMP = 3,5-dimethylpyrazole) in methanol, whereas the same reactants in dimethylformamide (DMF) gave binuclear 3,5-dimethylpyrazolato bridged zinc carboxylate complexes containing monodentate 3,5-dimethylpyraozole ligands with composition [Zn2(mu-DMP)2(HDMP)2(RCO2)2]. The mononuclear complexes can be converted to the corresponding binuclear complexes by simply dissolving in DMF. The reaction of zinc(II)acetate dihydrate with p-nitrobenzoic acid and 3,5-dimethylpyrazole in different solvents gave solvated mononuclear complexes of the corresponding solvent. All these solvated complexes having the core [Zn(HDMP)2(p-NO2-C6H4CO2)2] contain two structurally independent molecules in the asymmetric unit (Z' = 2).
Sarma
Rupam
R
Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, 781 039, Assam, India.
Kalita
Dipjyoti
D
Baruah
Jubaraj B
JB
D002264:Carboxylic Acids / Q000737:chemistry*; D018360:Crystallography, X-Ray; D008968:Molecular Conformation; D011720:Pyrazoles / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry*; D015032:Zinc / Q000737:chemistry*
D002264:Carboxylic Acids; D011720:Pyrazoles; D012997:Solvents; C027635:3,5-dimethylpyrazole; D015032:Zinc