Five-coordinate Cobalt(II), Nickel(II) and Zinc(II) Complexes Derived from 2-pyridine-2-yl-3-(pyridine-2-carboxylideneamino)-1,2-dihydroquinazolin-4(3H)-one. The Crystal Structure of the Cobalt(II) Complex

Gudasi, Kalagouda B.
Vadavi, Ramesh S.
Shenoy, Rashmi V.
Patil, Manjula S.
Patil, Siddappa A.
Nethaji, Munirathinam

¹Department of Chemistry, Karnatak University, Dharwad, 580 003, India.
²Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore, 560 012, India.

^*Author for correspondence: E-mail: [email protected]

Transition Metal Chemistry 30(6):p 661-668, September 2005.

The synthesis of cobalt(II), nickel(II) and zinc(II) complexes of 2-pyridine-2-yl-3(pyridine-2-carboxylideneamino)-1,2-dihydroquinazolin-4(3H)-one is described. The ligand and metal complexes were characterized by elemental analysis, conductivity measurements, spectral (u.v.–vis., i.r., 1D n.m.r., 2D hetcor and mass) and thermal studies. The cobalt(II) complex crystallizes as pink crystals in the monoclinic crystal system, space group P21/n with a = 10.066(6) Å, b = 15.929(9) Å, c = 12.624(7) Å, α = 90.00(9)°, β = 110.850 (8)°, γ = 90.00, V = 1891.5 (18) Å³ and Z = 4. The geometry around the cobalt atom is distorted trigonal bipyramidal with τ = 0.83 [structural parameter, τ = (β − α)/60; where α and β are the two basal angles in a five coordinate complex].