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

Abstract

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-C6H2[CH2OCH2C(pz)3]4, L4}, and [Cd2(thf)5](BF4)4 (thf is tetrahydrofuran) produces the coordination polymer catena-poly[[[bis[acetonitrilecadmium(II)]-μ4-1,2,4,5-{[2,2,2-tris(1H-pyrazol-1-yl)ethoxy]methyl}benzene] tetrakis(tetrafluoroborate)]-diethyl ether-acetonitrile (1/2/2)], {[Cd2(CH3CN)2(C54H54N24O4)](BF4)4·2C4H10O·2CH3CN}n. The CdII center is coordinated in a κ3-fashion by one tris(pyrazolyl)methane group and in a κ2-κ0 fashion by another, while the sixth coordination site on the CdII 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 C6H2 spacer. This compound is isostructural with the silver(I) analogue of this ligand, i.e. {[Ag2(L4)](BF4)2·4CH3CN}n, thus showing the tendency of this system to form metal-based macrocyclic architectures.