Synthesis and Crystal Structure of [Cu(BDBPH)(ClO₄)₂] (BDBPH = Butane-2,3-dione bis(2′-pyridylhydrazone)

Abstract

Butane-2,3-dione bis(2′-pyridylhydrazone) (BDBPH), a Schiff-base condensate, was synthesized by 1:2 mol ratio condensation of butane-2,3-dione with 2-hydrazino pyridine in dehydrated methanol. BDBPH has been characterised by C, H and N microanalyses, FT-IR, ¹H NMR and UV–Vis spectra. Reaction of 1:1 stoichiometric proportion of BDBPH with copper(II)perchlorate hexahydrate in methanol affords a mononuclear copper(II) complex, [Cu(BDBPH)(ClO₄)₂] (1). 1 crystallizes in the monoclinic space group P $\overline{1}$ with a = 8.4230(2), b = 9.7869(3), c = 12.3508(3) Å, α = 103.784(2), β = 90.900(2), γ = 94.906(2)^°, V = 984.51(5) Å³ and Z = 2. The copper(II) compound is octahedral and one-electron paramagnetic. Bond Valence Sum (BVS) model calculation was also performed to assign the oxidation number of the copper center.

Index Abstract

The X-ray crystal structure (1) of the complex copper(II) with butane-2,3-dione bis(2′-pyridylhydrazone) (BDBPH) reveals that the complex is mononuclear. The Jahn–Teller distorted octahedral copper(II) compound is one-electron paramagnetic.