A cadmium(II) coordination polymer formed from a third generation tetratopic tris(pyrazolyl)methane ligand.

The reaction of a third generation tetratopic tris(pyrazolyl)methane ligand, namely 1,2,4,5-{[2,2,2-tris(1H-pyrazol-1-yl)ethoxy]methyl}benzene {1,2,4,5-CH[CHOCHC(pz)], L4}, and [Cd(thf)](BF) (thf is tetrahydrofuran) produces the coordination polymer catena-poly[[[bis[acetonitrilecadmium(II)]-μ-1,2,4,5-{[2,2,2-tris(1H-pyrazol-1-yl)ethoxy]methyl}benzene] tetrakis(tetrafluoroborate)]-diethyl ether-acetonitrile (1/2/2)], {[Cd(CHCN)(CHNO)](BF)·2CHO·2CHCN}. The Cd center is coordinated in a κ-fashion by one tris(pyrazolyl)methane group and in a κ-κ fashion by another, while the sixth coordination site on the Cd cation is occupied by an acetonitrile molecule. This bonding mode of the ligand generates an infinite one-dimensional structure built upon 32-atom metallomacrocycles connected by the CH spacer. This compound is isostructural with the silver(I) analogue of this ligand, i.e. {[Ag(L4)](BF)·4CHCN}, thus showing the tendency of this system to form metal-based macrocyclic architectures.