Highly interpenetrated diamondoid nets of Zn(II) and Cd(II) coordination networks from mixed ligands

The syntheses, structures and thermal properties of three coordination networks [Zn(L¹1)(1,4-BDC)]·H₂O (L¹1 = N,N′-di(4-pyridyl)adipoamide; 1,4-H₂BDC = 1,4-benzenedicarboxylic acid), 1, [Cd(L¹1)(1,4-BDC)]·2H₂O, 2, and [Zn₂(L²2)(1,4-BDC)₂]·2CH₃OH (L²2 = N,N′-di(4-pyridyl)dodecanamide), 3, are reported. Complexes 1 and 2 show the dia topology with the rare 8- and 9-fold interpenetrating modes, respectively, while 3 exhibits an interpenetrating 3-fold framework with the pcuZn₂(COO)₂ dimer decorated topology. Complex 2 shows the maximum number of interpenetration presently known for interpenetrating diamondoid networks of coordination networks containing mixed spacer ligands.