Topological diversity in zinc coordination polymers with 5-substituted isophthalate and bis(4-pyridylmethyl)piperazine ligands

Abstract

The structures of luminescent divalent zinc coordination polymers containing a 5-substituted isophthalate ligand and the long-spanning hydrogen-bonding capable tethering ligand bis(4-pyridylmethyl)piperazine (bpmp) show a wide variety of two- and three-dimensional topologies. {[Zn(NO2ip)(Hbpmp)][ZnCl(H2O)(NO2ip)]}n (1, NO2ip = 5-nitroisophthalate) possesses parallel two-fold interpenetrated cationic (4,4) coordination polymer grids along with embedded anionic one-dimensional (1-D) chain motifs. The chloride-free derivative {[Zn5(NO2ip)6(Hbpmp)2(bpmp)]·2H2O}n (2) manifests trinuclear units linked into a complex doubly interpenetrated 4,8-connected binodal 3-D lattice with (456)2(414614) topology. {[Zn(OHip)(bpmp)]·H2O}n (3, OHip = 5-hydroxyisophthalate) has a five-fold interpenetrated diamondoid topology, while [Zn2(tBuip)2(bpmp)]n (4, tBuip = 5-tert-butylisophthalate) shows a two-fold interpenetrated primitive cubic net based on dimeric units. {[Zn(OMeip)(bpmp)]·8H2O}n (5, OMeip = 5-methoxyisophthalate) adopts an undulating (4,4) single-grid 2-D topology. {[Zn(sip)(Hbpmp)]·4H2O}n (6, sip = 5-sulfoisophthalate) displays a novel three-fold interpenetrated 3,5-connected binodal lattice with (426)(426583) topology.