Novel 2D → 2D Entanglement Pattern in the Coordination Network with Both Polyrotaxane and Polycatenane Features

The combination of α,α′-dihydroxybibenzyl-4,4′-dicarboxylate and 4,4′-bipyridine as bridging ligands to bind Zn(II) leads to an unprecedented 2D → 2D entanglement pattern having both polyrotaxane and polycatenane features

Novel 2D → 2D Entanglement Pattern in the Coordination Network with Both Polyrotaxane and Polycatenane Features

The combination of α,α′-dihydroxybibenzyl-4,4′-dicarboxylate and 4,4′-bipyridine as bridging ligands to bind Zn(II) leads to an unprecedented 2D → 2D entanglement pattern having both polyrotaxane and polycatenane features

Random Co(II)–Ni(II) Ferromagnetic Chains Showing Coexistent Antiferromagnetism, Metamagnetism, and Single-Chain Magnetism

A series of isomorphous compounds of general formula [Co_1–<i>x</i>Ni_<i>x</i>(tzpo)­(N₃)­(H₂O)₂]_<i>n</i>·<i>n</i>H₂O (<i>x</i> = 0, 0.19, 0.38, 0.53, 0.68, 0.84, and 1; tzpo = 4-(5-tetrazolate)­pyridine-<i>N</i>-oxide) was prepared. The compounds consist of homometallic or heterometallic chains with simultaneous azide-tetrazolate bridges. The heterometallic systems feature random distribution of metal ions. All compounds across the series exhibit intrachain ferromagnetic coupling, interchain antiferromagnetic (AF) ordering, field-induced metamagnetic transition, and, except the Ni-only compound, single-chain magnetic dynamics. The AF ordering temperature, the metamagnetic critical field, and the relaxation parameters show different composition dependence. Notably, the blocking temperature for the Co-rich materials is higher than the Co-only compound, suggesting synergy between the randomly distributed Co­(II) and Ni­(II) ions in promoting slow relaxation. The results imply rich physics in the random mixed-metal systems and demonstrate the possibility of improving single-chain relaxation properties by blending metal ions

Novel 2D → 2D Entanglement Pattern in the Coordination Network with Both Polyrotaxane and Polycatenane Features

The combination of α,α′-dihydroxybibenzyl-4,4′-dicarboxylate and 4,4′-bipyridine as bridging ligands to bind Zn(II) leads to an unprecedented 2D → 2D entanglement pattern having both polyrotaxane and polycatenane features

Metal−Organic Framework Based on [Zn₄O(COO)₆] Clusters: Rare 3D Kagomé Topology and Luminescence

A 2-fold interpenetrated metal−organic framework displaying intense yellow fluorescence is constructed from [Zn4O(COO)6] clusters and a new dicarboxylate ligand bearing the fluorene chromophore fluorene-2,7-dicarboxylic acid. The [Zn4O(COO)6] secondary building unit exhibits unusual coordination features and leads to the rare 3D pillared kagomé net topology (324865)

Novel Functionalized Metal−Organic Framework Based on Unique Hexagonal Prismatic Clusters

The novel porous 3D metal−organic framework synthesized from fluorenone-2,7-dicarboxylate contains zinc−glycolate−carboxylate layers in which the unique hexagonal prismatic [Zn6(OCH2CH2O)6] clusters are connected by planar [Zn3(OCH2CH2O)(COO)2] motifs; the pore surface is furnished with carbonyl groups and open metal sites

Synthesis, Structures, and Magnetism of Copper(II) and Manganese(II) Coordination Polymers with Azide and Pyridylbenzoates

Three transition-metal coordination polymers with azide and/or carboxylate bridges have been synthesized from 4-(3-pyridyl)benzoic acid (4,3-Hpybz) and 4-(4-pyridyl)benzoic acid (4,4-Hpybz) and characterized by X-ray crystallography and magnetic measurements. Compound 1, [Cu(4,3-pybz)(N3)]n, consists of 2D coordination networks in which the uniform chains with (μ-EO-N3)(μ-COO) double bridges are cross-linked by the 4,3-pybz ligands. Compound 2, [Cu2(4,4-pybz)3(N3)]n·3nH2O, consists of 2-fold interpenetrated 3D coordination networks with the α-Po topology, in which the six-connected dinuclear motifs with mixed (μ-EO-N3)(μ-COO)2 (EO = end-on) triple bridges are linked by the 4,4-pybz spacers. Compound 3, [Mn(4,4-pybz)(N3)(H2O)2]n, contains 2D manganese(II) coordination networks in which the chains with single μ-EE-N3 bridges (EE = end-to-end) are interlinked by the 4,4-pybz ligands, and the structure also features a 2D hydrogen-bonded network in which MnII ions are linked by double triatomic bridges, (μ-EE-N3)(O–H···N) and (O–H···O)2. Magnetic studies indicated that the mixed azide and carboxylate bridges in 1 and 2 induce ferromagnetic coupling between CuII ions and that 3 features antiferromagnetic coupling through the EE-azide bridge. In addition, compound 1 exhibits antiferromagnetic ordering below 6.2 K and behaves as a field-induced metamagnet. A magnetostructural survey indicates a general trend that the ferromagnetic coupling through the mixed bridges decreases as the Cu–N–Cu angle increases

Novel Functionalized Metal−Organic Framework Based on Unique Hexagonal Prismatic Clusters

The novel porous 3D metal−organic framework synthesized from fluorenone-2,7-dicarboxylate contains zinc−glycolate−carboxylate layers in which the unique hexagonal prismatic [Zn6(OCH2CH2O)6] clusters are connected by planar [Zn3(OCH2CH2O)(COO)2] motifs; the pore surface is furnished with carbonyl groups and open metal sites

Metal−Organic Framework Based on [Zn₄O(COO)₆] Clusters: Rare 3D Kagomé Topology and Luminescence

A 2-fold interpenetrated metal−organic framework displaying intense yellow fluorescence is constructed from [Zn4O(COO)6] clusters and a new dicarboxylate ligand bearing the fluorene chromophore fluorene-2,7-dicarboxylic acid. The [Zn4O(COO)6] secondary building unit exhibits unusual coordination features and leads to the rare 3D pillared kagomé net topology (324865)

Assembling the Cage-Based Metal−Organic Network from a Cubic Metalloligand

A novel 3D assembly of molecular cobalt cubes, where the mixed-valence cubes are linked by macrocyclic nickel(II) complexes through coordination and hydrogen bonds, has been constructed by the metalloligand strategy