PREPARATION, CHARACTERIZATION AND THERMAL-BEHAVIOR OF N-(3-AMINOPROPYL)-1,3-PROPANEDIAMINE COMPLEXES OF NICKEL(II) IN THE SOLID-STATE

The complexes [Ni(dpt)(2)]X(2).nH(2)O (where dpt is N-(3-aminopropyl)-1,3-propanediamine; n=0 when X is I, NCS or ClO4; n=1 when X is Cl, Br or NO3; n much greater than 1 when X is 0.5SO(4) and 0.5SeO(4)), Ni(dpt)X(2).nH(2)O (n=0 when X is Cl or NO3; n=1 when X is Br or I; n=2 when X is NO3; n=3 when X is 0.5SO(4) or 0.5SeO(4)), [Ni(aepn)(2))]I-2, Ni(aepn)I-2 (where aepn is N-(2-aminoethyl)-1,3-propanediamine), [Ni(dien)(2)]I-2 and Ni(dien)I-2 (where dien is diethylenetriamine) have been synthesised from the solution and thermal investigations upon them have been carried out in the solid state. [Ni(dpt)(2)]X(2) (X is Br or NO3) undergoes endothermic reversible phase transitions upon heating (198-212 degrees C, Delta H=3.5 kJ mol(-1) and 205-222 degrees C for [Ni(dpt)(2)]Br-2 and [Ni(dpt)(2)](NO3)(2) respectively). Ni(dpt)I-2 shows exothermic irreversible phase transition during heating (193-220 degrees C; Delta H=4.1 kJ mol(-1)). The thermal stabilities of dpt complexes are compared with those of the corresponding aepn and dien complexes.