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Three new Zn(II) complexes, [Zn 2 L 2 (OAc) 2 ]2CH 3 OH ( 1 ), [ZnL(3-NA) 2 ]·H 2 O ( 2 ) and [ZnL(2-NA) 2 ] ( 3 ) were synthesized by the reaction of Zn(CH 3 COO) 2 ·2H 2 O or Zn(ClO 4 ) 2 ·6H 2 O with 2-amino- N' -(pyridin-2-ylmethylene)benzohydrazide (HL), 3-nitrobenzoic acid (3-NA) or 2-nitrobenzoic acid (2-NA). The complexes were characterized by elemental analyses, single crystal X-ray diffraction, IR, UV-Vis and  1 H NMR spectroscopy. The single crystal X-ray diffraction analyses revealed that the Zn ions in the complexes are five-coordinate in tetragonal pyramid configuration. The complexes and their starting materials Zn(CH 3 COO) 2 ·2H 2 O and Zn(ClO 4 ) 2 ·6H 2 O were studied for their catalytic performance in the selective oxidation of cyclohexane (Cy) with aqueous H 2 O 2  as oxidant. The conditions such as time, the amount of H 2 O 2 , solvent and HNO 3  additive were optimized. The results showed that  3  has the best activity under mild conditions compared to the starting zinc materials and the referenced zinc complexes.

Three new zinc(II) complexes: design, synthesis, characterization and catalytic performance