Pillared two-dimensional metal-organic frameworks based on a lower-rim acid appended calix[4]arene

Abstract

Solvothermal reactions of the lower-rim functionalized diacid calix[4]arene 25,27-bis(methoxycarboxylic, acid)-26,28-dihydroxy-4-tert-butylcalix[4]arene, (LH2) with Zn(NO3)2·6H2O and the dipyridyl ligands 4,4′-bipyridyl (4,4′-bipy), 12-di(4-pyridyl)ethylene (DPE), or 4,4′-azopyridyl (4,4′-azopy) afforded a series of two-dimensional structures of the formulas {[Zn(4,4′-bipy)(L)]·21/4DEF}n, (1), {[Zn2(L)(DPE)]·DEF}n (2), and {[Zn(OH 2)2(L)(4,4′-azopy)]·DEF}n, (3) (DEF = diethylformamide). © 2013 American Chemical Society.