•Three new coordination polymers with H3TPA were synthesized.•Three different coordination fashions and various fascinating topologies were exhibited.•Elemental analysis, IR, XRD and XRPD were reported.•Magnetic, photoluminescence and thermal stabilities were analyzed.Three new coordination polymers, namely, {[Co2(TPA)(μ3-O)3]·0.5DMA}n (1), {[Co(H2TPA)(bibp)(H2O)3]·H2O}n (2) and {[Cd3(TPA)2(phen)4]·4H2O}n (3), (H3TPA = 5-(4-(tetrazol-5-yl)phenyl)isophthalic acid, bibp = 4,4'-bis(imidazolyl)biphenyl, phen = 1,10-phenanthroline and DMA = N,N-dimethylacetamide), have been synthesized under solvothermal conditions and structurally characterized by elemental analysis, IR spectroscopy, powder X-ray diffraction (PXRD) and single-crystal X-ray diffraction analysis. Polymer 1 exhibits a three-dimensional (3D) structure constructed from 5-connected secondary building units (SBUs) [Co3(μ3-O)] and 3-connected H3TPA ligands. Polymer 2 has a 1D zigzag polymer chain connected by H3TPA and bibp ligands. Polymer 3 features an unusual 3D framework with a (3,4,2)-connected {4; 6;8}{4; 62;83} topology. Moreover, the thermal stabilities of 1–3 and photoluminescence properties of 3 have been investigated. Magnetic susceptibility measurements indicate that polymers 1–2 display antiferromagnetic exchange properties.

Two new interesting entangled structures, namely, [Ni1.5(L)(bpy)2(H2O)3]n · 3nH2O (I) and [Cd3(L)2(bbi)2]n · nH2O (II)(where H3L is 4-(4-carboxyphenoxy)-phthalic acid, bpy is 4,4′-bipyridine, and bbi is 1,1′-(1,4-butanediyl)bis(imidazole)) have been synthesized and characterized by elemental analysis (EA), infrared spectra (IR), X-ray powder diffraction (XRPD), solid fluorescence and thermogravimetric analysis (TGA). Single-crystal X-ray diffraction analysis revealed that complex I possesses a 3D self-penetrating framework constructed from ladder-like and fishbone-like subunits. Complex II shows a 3D framework of two-fold interpenetration assembled from trinuclear Cd(II) clusters bridged by bbi and L3− ligands.

Five new coordination polymers, namely, [Zn(HL)(bib)]n·2nH2O (1), [Zn2(L)(μ3-OH)(H2O)]n·2nH2O (2), [Cd1.5(L) (H2O)2]n·0.5nH2O (3), [Cd1.5(L) (CH3CN)]n·0.5nH2O (4) and [Cd1.5(L)(bib)(H2O)2]n·nH2O (5), (H3L = biphenyl-2,4′,5-tricarboxylic acid, bib = 4,4′-bis(imidazol-1-yl)phenyl) have been synthesized under solvothermal conditions. Complexes 1–5 have been characterized by elemental analysis, IR spectroscopy, powder X-ray diffraction (PXRD) and single-crystal X-ray diffraction analysis. Complex 1 shows a 2D (4,4) network and further forms a 3D supramolecular framework by π–π interactions. Complex 2 is a 3D framework based on infinite rod-shaped chains. Complex 3 exhibits a 3D framework with a (3,4,5)-connected {42·6}2{42·84}{43·6·86}2 topology. Complex 4 features a 3D network with a (4,4,6)-connected {44·62}3{46·67·82}2 topology. 5 displays a 3D 2-fold interpenetrating (4,4,4)-connected framework with a point symbol of {4·64·10}2{4·64·8}2{62·84}. Moreover, the thermal stabilities and photoluminescence properties of 1–5 have been investigated.

Five new coordination polymers, namely, [Mn(L)(BIP)2]·H2O (1), [Cd(L)(BIBP)]·1/2DMF·3/2H2O (2), [Cd3(L)3(phen)2] (3), [Mn3(L)3(phen)2]n (4), and [Mn2(L)2(DMF)·(H2O)]·DMF (5) (H2L = 2′,5′-dimethyl-1,1′:4′, 1′′-terphenyl-3,3′′-dicarboxylic acid, BIP = 4,4′-bis(imidazol-1-yl)phenyl, BIBP = 4,4′-bis(imidazol-1-yl)biphenyl, phen = 1,10-phenanthroline and DMF = N,N-dimethylformamide), have been synthesized under solvothermal conditions. Complexes 1 and 2 display similar 3-fold interpenetrating 3D frameworks with {412·63} pcu topology, but they both possess different structures. Complexes 3 and 4 show non-interpenetrating 3D networks with pcu topology constructed by L2− ligands and phen ligands. Complex 5 is a non-interpenetrating 3D framework based on infinite rod-shaped SBUs. Obviously, with the increase of the steric hindrance or the use of rigid rod-shaped SBUs, complexes 3–5 have efficiently avoided interpenetration. All the complexes are characterized using single-crystal X-ray diffraction analyses, powder X-ray diffraction (PXRD), IR spectra, and elemental analyses. Moreover, thermal stabilities for 1–5 and photoluminescence properties of 2 and 3 have been investigated. The antiferromagnetic properties of 1, 4, and 5 have also been studied.

Two complexes, {Zn(bptc)0.5(bib)}n (I) and {Mn2(bptc)(pip)(H2O)}n (II) (H4bptc = biphenyl-3,3′,5,5′-tetracarboxylic acid; bib = 1,4-bis(2-methylimidazol-1-yl)butane; pip = 2-phenyl-1H-imidazo[4,5-f][1,10]phenanthroline) were synthesized and characterized by single-crystal X-ray diffraction, elemental analysis, IR, TGA and solid fluorescence spectra. The results show that I and II both have 3D network architectures. I has porous architecture with a 162 topology structure. Effective porosity calculated by Platon is 5.5 %. Moreover, it has a two-fold interpenetrating structure allowed by a 70.73° torsion between the benzene rings of the bptc4− ligand and the flexibility of bib. II has a tetranuclear structure composed of binuclear architecture units with the torsion of 43.44° between the benzene rings of the bptc4− ligand. TGA shows that the skeletons of I and II are stable up to 372°C and 553°C, respectively. I exhibits fluorescence.

Five new coordination polymers, {[Cd3(bpt)2(DMF)2]·(H2O)2}n (1), [Cd(Hbpt)(bipy)0.5(H2O)]n (2), [Cd2(bpt)(phen)2Cl]n (3), {[Cu2(bpt)(phen)(μ2–OH)(H2O)]·(H2O)2}n (4) and {[Mn5(Hbpt)4(phen)4(μ2–OH)2(H2O)2]·(H2O)2(CH3CN)2}n (5) have been prepared through hydro(solvo)thermal reactions of H3bpt (H3bpt=biphenyl-3,4′,5-tricarboxylic acid) with different pyridyl-containing auxiliary ligands (bipy=4,4′-bipyridine and phen=1,10-phenanthroline). Compound 1 represents a 3D ladder-like framework composed of rod-shaped infinite chains. In 2, the bridging ligand bipy links binuclear cadmium ions to generate a 2D layer. Compound 3 features a 1D ladder structure and further linked by π–π stacking interaction to form a 3D supramolecular network. Compound 4 exhibits a binodal 3-connected net which features the Schlafli symbol of (4·82). Compound 5 contains trimetallic cluster and binuclear unite which are further linked by Hbpt ligand to form a 2D layer. Moreover, photoluminescent properties of compounds 1–3 were studied in the solid state. Magnetic susceptibility measurements indicate that compound 4 exhibits ferromagnetic exchange interactions, whereas compound 5 displays antiferromagnetic exchange interactions.Graphical abstractFive new coordination polymers have been prepared through reactions of H3bpt with different pyridyl-containing auxiliary ligands. The bpt exhibits four new kinds of coordination modes with “V or Y shape”.Highlights► 1 represents a unique (4·8)-connected network with a Schlafli symbol (46)(412·612·84). ► Compound 4 shows ferromagnetic interaction between the dimeric Cu2+ units. ► The bpt ligand exhibits four new kinds of coordination modes with “V or Y shape”.

Two complexes, {[Cd6(o-dppd)2(µ2-Cl)6(µ3-Cl)2(DMF)2(H2O)2Cl2]·DMF·CH3OH}n (I) (DMF = N,N-dimethylformamide; o-dppdH = 1,3-di(pyridin-2-yl)propane-1,3-dione) and [Cu4(o-dppd)2(OAc)4(OH)2]·4H2O (II), were synthesised and characterised by single-crystal X-ray diffraction, elemental analysis, IR, solid fluorescence and TGA. The results showed that complex I had a rodshaped polynuclear chain with hexacoordinating Cd atoms bridged by oxygen, µ2-Cl and µ3-Cl; complex II was a tetranuclear oligomer. In general, supramolecular architectures are constructed through hydrogen-bonding and π-π stacking interactions. I shows luminescence.

A novel three-dimensional (3-D) lanthanide metal-organic frameworks, {[Gd2(ABTC)2(DMF)2(H2O)2]·DMF·H2O}n1 (L = H3ABTC = 3, 4′, 5-azobenzenetricarboxylic acid, DMF = N,N′-dimethylformamide) has been prepared under mild conditions, and characterized by single-crystal X-ray diffraction, IR spectra, PXRD, and TG analysis. The magnetic measurement shows that 1 presents antiferromagnetic behavior.{[Gd2(ABTC)2(DMF)2(H2O)2]·DMF·H2O}n is a [Ln2(COO)6] dinuclear group, which serves as octahedral secondary building units (SBUs) to produce a novel 3-D porous framework. Moreover, it could be anticipated to be potential antiferromagnetic materials.Research Highlights►The complex is the octahedral SBUs containing chelate-bridging carboxylate groups. ►The complex is first example to construct noninterpenerative LMOF with the octahedral SBUs. ►The complex presents antiferromagnetic behavior.

A new complex, [Cu2(μ2-Cl)2(IP)2Cl2] · 4H2O (IP = imidazo[4,5-f]1,10-phenathroline), was synthesised and characterised by elemental analysis, thermal analysis, IR spectra, and X-ray crystallography. The results showed that the complex crystallises in the monoclinic space group P\( \bar 1 \); a = 7.880 (2) Å, b = 9.227(2) Å, c = 10.694(2) Å; α = 97.788(4)°, β = 100.637(4)°, γ = 95.841(3)°; V = 750.7(3) Å3, and Z = 1. The complex is further stabilised by H-bonds and a π-π stacking interaction between the pyridine and benzene rings of two neighbouring molecules with the centroid.centroid distance of 3.498(3) Å, leading to a 3D supramolecular architecture. Thermal decomposition procedure of the complex explored by TG-DTG has three stages, and the final product is Cu in residual rate of 16.18 % (calculated to be 16.26 %).

A new complex, [Cu(BTZ)(DMF)Cl]2 [BTZ = 2-(2-hydroxyphenyl)benzothiazolate, DMF = N,N-dimethylformamide], was synthesized and characterized by X-ray crystallography, elemental analysis, IR spectrum, and TG−DTG. The results show that the complex crystallizes in a monoclinic space group P21/c; a = 10.478(3) Å, b = 8.993(3) Å, c = 18.482(6) Å; β = 105.697(5)°; V = 1676.59 Å3; and Z = 4. The structure of the complex is dimeric [Cu(BTZ)(DMF)Cl]2 with two isotropic Cu2+ ion centers having five-coordinate geometry. The constant-volume combustion energy of the complex, ΔcU, was determined as being (−17 689.56 ± 6.77) kJ·mol−1 by a precise rotating-bomb calorimeter (RBC-type II). The standard molar enthalpy of combustion, ΔcHmθ, and the standard molar enthalpy of formation, ΔfHmθ, were calculated at 298.15 K as being (−17 706.91 ± 6.77) kJ·mol−1 and (−738.67 ± 7.96) kJ·mol−1, respectively.

Five complexes of M(BTZ)2 [M = Mn, Co, Ni, Cu, Zn; BTZ = 2-(2-hydroxyphenyl)benzothiazolate] were synthesized by the reaction of hydrated metal chloride with the ligand BTZ in the mixed solvent of ethanol and methanol and characterized by chemical and elemental analysis, IR spectroscopy, and thermogravimetric/differential thermogravimetric analysis (TG-DTG). The results show that their thermal decomposition temperature was over 573 K and the complexes were completely converted to oxides at higher temperature. In addition, the constant-volume combustion energies of the complexes, ΔcU, were determined by a precise rotating-bomb calorimeter (RBC-type II). Their standard molar enthalpies of combustion, ΔcHmθ, and standard molar enthalpies of formation, ΔfHmθ, were calculated at 298.15 K. The values of standard molar enthalpies of formation were derived and range between [−(339.97 ± 6.09) and −(2165.92 ± 5.91)] kJ·mol−1 for the complexes.

Fourteen rare earth complexes with salicylic acid RE(HSal)3·nH2O (HSal = C7H5O3; RE = La–Sm, n = 2; RE = Eu–Lu, n = 1) were synthesized and characterized by elemental analysis, and their thermal decomposition mechanism were studied with TG–DTG technology. The constant-volume combustion energies of complexes, ΔcU, were determined by a precise rotating-bomb calorimeter at 298.15 K. Their standard molar enthalpies of combustion, ΔcHm∘, and standard molar enthalpies of formation, ΔfHm°, were calculated.