Impact of Isomeric Dicarboxylate Ligands on the Formation of One-Dimensional Coordination Polymers and Metallocycles: A Novel cis→trans Isomerization

A series of Co(II), Ni(II) and Cu(II) coordination polymers and dinuclear metallocycles containing 4-aminopyridine (4-ampy) and benzenedicarboxylate ligands, {[M(4-ampy)₂(1,4-BDC)]·H₂O·CH₃CH₂OH}_n (M = Ni, 1a; Co, 1b, 1,4-H₂BDC = benzene-1,4-dicarboxylic acid), {[Ni₂(4-ampy)₄(1,3-BDC)₂]·H₂O·CH₃CH₂OH}_n (1,3-H₂BDC = benzene-1,3-dicarboxylic acid), 2, [M₂(4-ampy)₄(1,2-BDC)₂] (M = Ni, 3a; Co, 3b, 1,2-H₂BDC = benzene-1,2-dicarboxylic acid), [Co(4-ampy)₂(1,3-BDC)]_n,4, {[Cu(4-ampy)₂(1,4-BDC)] CH₃CH₂OH}_n, 5a, and {[Cu(4-ampy)₂(1,4-BDC)]·H₂O}_n, 5b·H₂O, are reported, which were hydrothermally prepared and structurally characterized by using single crystal X-ray diffraction. Complexes 1a and 1b are isomorphous 1D zigzag chains, while 2 displays a concave–convex chain and 3a and 3b are dinuclear metallocycles that differ in the boding modes of the 1,2-BDC²⁻ ligands, forming a 3D and a 2D supramolecular structures with the pcu and sql topologies, respectively. Complex 4 exhibit a 1D helical chain and complexes 5a and 5b·H₂O are 1D linear and zigzag chains, in which the Cu₂-1,4-BDC²⁻ units adopt the cis and trans configurations, respectively. A novel irreversible structural transformation due to cis→trans isomerization of the Cu₂-1,4-BDC²⁻ units was observed in 5b⋅H₂O and 5a upon water adsorption of the desolvated product of 5b·H₂O.

Crystal-to-crystal transformation and linker exchange in Cd(ii) coordination polymers based on flexible bis-pyridyl-bis-amide and 1,4-naphthalenedicarboxylate

Solvothermal reactions of Cd(ii) salts and naphthalene-1,4-dicarboxylic acid with bis(N-pyrid-3-ylmethyl)adipoamide and bis(N-pyrid-3-ylmethyl)suberoamide yield three Cd(ii) coordination polymers that undergo reversible crystal-to-crystal transformation and linker exchange.

Influence of different metal ions on the assembly, structures, and properties of two complexes based on the semi-rigid bis(pyridyl)-bis(amide) ligand and 4,4′-oxybis(benzoic acid)

Two transitional metal complexes, [Zn(oba)(3-bpcd)] n (1) and [Cd(oba)(3-bpcd)0.5] n (2) [H2oba= 4,4′-oxybis(benzoic acid), 3-bpcd=N,N′-bis(pyridin-3-yl)cyclohexane-1,4-dicarboxamide], have been hydrothermally synthesized and structurally characterized by elemental analyses, infrared spectra, powder X-ray diffraction, thermogravimetric and single-crystal X-ray diffraction. Complex 1 possesses a three-fold interpenetrating network based on layers with a 4-connected sql topology. Complex 2 is a layered framework constructed by the oba anions and 3-bpcd ligands, which represents a binodal (3,4)-connected {62.10}{6} topology. The adjacent layers of complex 2 are further linked by hydrogen bonding interactions to build a three-dimensional supramolecular architecture. The differences of metal ions in coordination modes show a significant effect on the final structures of the Zn(II)/Cd(II) complexes. The photocatalytic activities and the fluorescence sensing properties of complexes 1 and 2 were investigated.

Three in situ-synthesized novel inorganic–organic hybrid materials based on metal (M = Bi, Pb) iodide and organoamine using one-pot reactions: structures, band gaps and optoelectronic properties

The title compounds with different band structures and photocurrent responses possess good water-proof properties due to the hydrophobic aromatic groups.

Structure, sensing and photocatalytic properties of two multifunctional 3D luminescent coordination polymers based on an N-heterocyclic carboxylic acid

Two novel luminescent coordination polymers, {[Zn(tmlb)(H₂tmlb)]·H₂O}_n (1) and [Zn(tmlb)(bbibp)]_n (2) ((bbibp = bis(benzoimidazo-1-ly)biphenyl), H₂tmlb = (1H-1,2,4-triazol-1-yl)methylenebis(benzoic acid)), have been rationally designed and successfully solvothermally synthesized.

Syntheses, structural diversity, magnetic properties and dye absorption of various Co(ii) MOFs based on a semi-flexible 4-(3,5-dicarboxylatobenzyloxy)benzoic acid

Various polymeric structures of MOFs1–5.

Syntheses, structures, luminescent and photocatalytic properties of various polymers based on a “V”-shaped dicarboxylic acid

Four novel luminescent coordination polymers were synthesized under solvothermal conditions, and compounds2–4can serve as a Fe³⁺/Cu²⁺fluorescent sensor through quenching the luminescence, respectively.

A series of pyridyl-amide-based ZnII/CdII coordination polymers and their polypyrrole-functionalized composite materials for tuning their photocatalytic properties

Six pyridyl-amide-based Zn^II/Cd^II coordination polymers have been solvothermally synthesized and decorated by polypyrrole for tuning their photocatalytic properties under visible irradiation.

A series of coordination polymers with tuned terphenyl tetracarboxylates and bis-pyridyl ligands with different flexibilities manifesting fluorescence properties and photocatalytic activities

Seven new coordination polymers derived from terphenyl tetracarboxylates and bipyridyl ligands with different flexibilities have been prepared. The electrochemical behaviors, fluorescence and photocatalytic properties have also been studied.

Metal Ion-Driven Assembly of Two New Coordination Polymers Constructed by Asymmetric Tricarboxylate and Imidazole-Containing Ligands: Syntheses, Crystal Structures, and Luminescent Properties

Two new coordination polymers, namely, {[Cd3(bpt)2(bimb)2]·2(H2O)}n (1) and [Zn3(bpt)2(bimb)2]n (2) (bpt = biphenyl-3,4′,5-tricarboxylate, bimb = 1,4-bis(1-imidazol-yl)-2,5-dimethyl benzene), have been obtained under hydrothermal conditions. Their structures have been determined by single-crystal X-ray diffraction analysis and further characterised by elemental analysis and infrared spectroscopy. Complex 1 exhibits a trinodal (4,4,4)-connected topology with Schläfli symbol of (4.62.83)4.(64.82). Complex 2 is also a three-dimensional structure and displays a (3,4,6)-connected topology with Schläfli symbol of (4.62)2.(42.66.85.102).(64.82). It is shown that the asymmetrically tricarboxylate can bear diverse structures regulated by metal ions. The photoluminescence behaviours of compounds 1 and 2 were also discussed.

Crystal structures, topologies and luminescent properties of three Zn(ii)/Cd(ii) coordination networks based on naphthalene-2,6-dicarboxylic acid and different bis(imidazole) linkers

Three new coordination polymers (CPs) based on H₂ndc acid have been synthesized and structurally characterized. Three CPs exhibit structural diversity depending on different bis(imidazole) bridging ligands and center metal ions.

Amide-containing zinc(ii) metal–organic layered networks: a structure–CO2 capture relationship

An intimate interrelationship between the structural characteristics and their CO₂ adsorption behavior has been demonstrated in this study.