Supramolecular pseudometallacycles in a nickel compound with 4,4-diaminodiphenylmethane: Synthesis and structure of {Ni[(CH2(C6H4NH2)2]2(NO3)2(H2O)2}

Abstract

The [Ni(DDM)2(NO3)2(H2O)2] complex (DDM is 4,4-diaminodiphenylmethane [CH2(C6H4NH2)2]) is synthesized, and its structure is determined. The crystals are triclinic, space group P\( \bar 1 \), a = 5.846(1) A, b = 9.450(2) A, c = 13.390(3) A, α = 105.63(3)°, β = 98.13(3)°, γ = 105.84(3)°, V = 666.6(2) A3, ρcalcd = 1.553 g/cm3, Z = 2. The Ni(II) ion (in the inversion center) is bound to a distorted octahedral array formed by the nitrogen atoms of the primary amino groups of the DDM molecules and the oxygen atoms of the monodentate nitrato groups and water molecules (Ni(1)-N(3) 2.119(2) A, Ni(1)-O(1) 2.122(2) A, Ni(1)-O(w) 2.047(2) A, angles at the Ni atoms vary in the 85.08(9)°–94.92(9)° interval). The structure contains supramolecular metallacycles formed by the O(w)-H…N(2) hydrogen bonds between the coordinated H2O molecules and the terminal amino groups of DDM. The metallacycles are joined by the Ni2+ ions into infinite chains running in the [111] direction.