Synthesis and Characterization of Some Transition Metal Complexes with Mixed Adenine and Acetylacetonate Ligands: Crystal Structures of Solvated Complex {[Cu(acac)2(adenine)]·EtOH} and {[Cu(acac)2(adenine)]·DMF·H2O}

Abstract

AbstractMetal complexes of divalent copper (1-2), cobalt (3), and nickel (4) with mixed ligands acetylacetone (acac) and adenine were prepared and characterized by IR, mass spectra, elemental and thermal analysis. The X-ray crystal structures of {[Cu(acac) 2 (adenine)]·EtOH} complex (1) and {[Cu(acac) 2 (adenine)]·DMF·H 2 O} (2) were determined. Compound (1) crystallizes in the triclinic space group P − 1 with a = 7.547(3) A, b = 7.828(3) A, c = 17.791(6) A, α = 79.538(6)°, β = 82.240(7)°, γ = 86.010(6)°, V = 1023.1(6) A 3 , and Z = 2. Complex (1) forms a hydrogen bonded 2:2 complex {[Cu(acac) 2 (adenine)] 2 :[EtOH] 2 } arranged in bilayers. Complex (2) crystallizes in the triclinic space group P − 1 with a = 7.828(2) A, b = 8.095(2) A, c = 16.995(5) A, α = 78.508(5)°, β = 84.949(5)°, γ = 89.285(5)°, V = 1051.2(5) A 3 , and Z = 2. Complex (2) also forms bilayers with H-bonded DMF. Thermal analysis TG and DSC of the compounds (25-800 °C, under N 2 ) reveals the disproportionation of ligands with the associated heat.Graphical AbstractMetal complexes of divalent copper, cobalt, and nickel with mixed ligands acetylacetone (acac) and adenine were prepared and characterized by IR, mass spectra, elemental and thermal analysis. The X-ray crystal structures of {[Cu(acac) 2 (adenine)]·EtOH} complex (1) and {[Cu(acac) 2 (adenine)]·DMF·H 2 O} (2) were determined. Complex (1) forms a hydrogen bonded 2:2 complex {[Cu(acac) 2 (adenine)] 2 :[EtOH] 2 } arranged in bilayers. Complex (2) also forms bilayers with H-bonded DMF.[IMAGE]