Preparation, crystal structure and thermochemistry of Zn(AMP)2Cl2

The complex of zinc chloride and 2-amino-4,6-dimethyloxyl pyrimidine (AMP) was prepared, and the composition of the complex was determined by chemical and elemental analyses. Complex was characterized by IR, XPS, 1H NMR and TG–DTG techniques. In addition X-ray structural analysis was performed. Crystals of [Zn(AMP)2Cl2] revealed the following parameters: Mr=446.59; orthorhombic Pbca; a=13.0208 (10); b=13.8531 (11); c=20.0652 (15) Å; V=3619.3 (5) Å3; Z=8; Dcalc=1.639 Mg m−3; Mo Kα λ=0.71073 Å; μ=1.683 mm−1; T=293 K; R=0.0431 for 2510 observed reflections. The constant-volume combustion energies of the ligand and the complex, ΔcE, were determined by a precise rotating-bomb calorimeter at 298.15 K. They were −3340.01±1.54 and −6552.76±3.55 kJ mol−1, respectively. Their standard enthalpy of combustion, ΔcHmθ, and standard enthalpy of formation, ΔfHmθ, were calculated, which were −3339.39±1.54, −6546.56±3.35 and −307.91±1.74, −995.10±3.93 kJ mol−1.