A series of metal–organic framework {Ln(BCPBA)(H2O)}n {Ln = Nd (1), Sm (2), Eu (3), Tb (4), Dy (5)}; {[Ln(BCPBA)(H2O)](H2O)}n {Ln = Pr (6), Gd (7)} have been synthesized through the hydrothermal synthesis method. These compounds possess non-interpenetrating 3D networks with 10.1438 Å × 17.9149 Å rhombic channels along the [001] direction. The results of temperature-dependent magnetic susceptibility measurements indicate that compounds 4 and 7 exhibit LnIII⋯LnIII antiferromagnetic interactions, while compound 5 exhibits LnIII⋯LnIII ferromagnetic interactions. Frequency dependent out-of-phase signals were observed in alternating current (ac) magnetic susceptibility measurements which indicate that they have slow magnetic relaxation characteristics. The luminescent properties of 1, 2, 3, 4, and 5 are also discussed. Due to the good match between the lowest triplet state of the ligand and the resonant energy level of the lanthanide ion, compound 4 has longer fluorescence lifetime (τ1 = 400.0000 ms, τ2 = 1143.469 ms) and higher quantum yield (Φ = 42%) compared with other compounds.

A series of metal–organic framework {Ln(BCPBA)(H2O)}n {Ln = Nd (1), Sm (2), Eu (3), Tb (4), Dy (5)}; {[Ln(BCPBA)(H2O)](H2O)}n {Ln = Pr (6), Gd (7)} have been synthesized through the hydrothermal synthesis method. These compounds possess non-interpenetrating 3D networks with 10.1438 Å × 17.9149 Å rhombic channels along the [001] direction. The results of temperature-dependent magnetic susceptibility measurements indicate that compounds 4 and 7 exhibit LnIII⋯LnIII antiferromagnetic interactions, while compound 5 exhibits LnIII⋯LnIII ferromagnetic interactions. Frequency dependent out-of-phase signals were observed in alternating current (ac) magnetic susceptibility measurements which indicate that they have slow magnetic relaxation characteristics. The luminescent properties of 1, 2, 3, 4, and 5 are also discussed. Due to the good match between the lowest triplet state of the ligand and the resonant energy level of the lanthanide ion, compound 4 has longer fluorescence lifetime (τ1 = 400.0000 ms, τ2 = 1143.469 ms) and higher quantum yield (Φ = 42%) compared with other compounds.

Solvothermal reactions of the semirigid 3,5-bi(4-carboxyphenoxy)benzoic acid (H3BCP) and transitional metal cations with the help of three ancillary bridging imidazole linkers afforded six coordination polymers, namely, [Co(HBCP)(1,4-bib)0.5]n (1), {[Mn1.5(BCP)(1,4-bib)0.5(μ2-H2O)(H2O)2]·(1,4-bib)0.5}n (2), {[Mn0.5(1,4-bib)(H2O)]·(H2BCP)}n (3), {[Fe(BCP)0.5(HCOO)0.5(4,4′-bibp)0.5]·2H2O}n (4), [Ni2.5(HBCP)(BCP)(4,4′-bibp)2(μ2-H2O)(H2O)2]n (5), and [Ni(HBCP)(1,4-bidb)1.5(H2O)2]n (6), (1,4-bib = 1,4-bis(1H-imidazol-4-yl)benzene, 1,4-bidb = 1,4-bis(1-imidazol-yl)-2,5-dimethyl benzene, 4,4′-bibp = 4,4′-bis(imidazol-1-yl)biphenyl). Their structures and properties were determined by single-crystal and powder X-ray diffraction analyses, IR spectra, elemental analyses, thermogravimetric analyses (TGA), and X-ray photoelectron spectroscopy (XPS). Complex 1 displays unusual 2D + 2D→2D parallel entangled networks consisting of (3,4)-connected 3,4L83 sheets. Complex 2 exhibits an interesting 2-fold interpenetrated framework with a trinodal (4,4,6)-connected (3·4·5·62·7)2(3·6·74)2(32·42·52·62·76·9) topology. The host network of complex 3 is a 2D 4-connected (44·62)-sql sheet. Complex 4 affords unprecedented 3D (4,6,6)-coordinated framework with point symbol of (45·6)(48·67)(49·63·83)2, in which the 1D helix water chains occupy the void channels. Complex 5 can be regarded as a novel self-penetrating (4,4,4,5)-coordinated framework with point symbol of (4·54·6)2(4·65·7·83)2(5·6·7·83)2(52·83·92), which contains two interpenetrated (3,4,4,5)-coordinated (4·54·6)2(4·65·7·83)2(5·6·7)2(52·83·92) subnets linked by μ2-H2O. Complex 6 shows a 1D ladder chain, which are further assembled into a 3D supramolecular structure via O–H⋯O and π⋯π interactions. Moreover, magnetic studies indicate that both complex 2 and 4 show antiferromagnetic properties.

Solvothermal reactions of the semirigid 3,5-bi(4-carboxyphenoxy)benzoic acid (H3BCP) and transitional metal cations with the help of three ancillary bridging imidazole linkers afforded six coordination polymers, namely, [Co(HBCP)(1,4-bib)0.5]n (1), {[Mn1.5(BCP)(1,4-bib)0.5(μ2-H2O)(H2O)2]·(1,4-bib)0.5}n (2), {[Mn0.5(1,4-bib)(H2O)]·(H2BCP)}n (3), {[Fe(BCP)0.5(HCOO)0.5(4,4′-bibp)0.5]·2H2O}n (4), [Ni2.5(HBCP)(BCP)(4,4′-bibp)2(μ2-H2O)(H2O)2]n (5), and [Ni(HBCP)(1,4-bidb)1.5(H2O)2]n (6), (1,4-bib = 1,4-bis(1H-imidazol-4-yl)benzene, 1,4-bidb = 1,4-bis(1-imidazol-yl)-2,5-dimethyl benzene, 4,4′-bibp = 4,4′-bis(imidazol-1-yl)biphenyl). Their structures and properties were determined by single-crystal and powder X-ray diffraction analyses, IR spectra, elemental analyses, thermogravimetric analyses (TGA), and X-ray photoelectron spectroscopy (XPS). Complex 1 displays unusual 2D + 2D→2D parallel entangled networks consisting of (3,4)-connected 3,4L83 sheets. Complex 2 exhibits an interesting 2-fold interpenetrated framework with a trinodal (4,4,6)-connected (3·4·5·62·7)2(3·6·74)2(32·42·52·62·76·9) topology. The host network of complex 3 is a 2D 4-connected (44·62)-sql sheet. Complex 4 affords unprecedented 3D (4,6,6)-coordinated framework with point symbol of (45·6)(48·67)(49·63·83)2, in which the 1D helix water chains occupy the void channels. Complex 5 can be regarded as a novel self-penetrating (4,4,4,5)-coordinated framework with point symbol of (4·54·6)2(4·65·7·83)2(5·6·7·83)2(52·83·92), which contains two interpenetrated (3,4,4,5)-coordinated (4·54·6)2(4·65·7·83)2(5·6·7)2(52·83·92) subnets linked by μ2-H2O. Complex 6 shows a 1D ladder chain, which are further assembled into a 3D supramolecular structure via O–H⋯O and π⋯π interactions. Moreover, magnetic studies indicate that both complex 2 and 4 show antiferromagnetic properties.

A series of metal–organic framework {Ln(BCPBA)(H2O)}n {Ln = Nd (1), Sm (2), Eu (3), Tb (4), Dy (5)}; {[Ln(BCPBA)(H2O)](H2O)}n {Ln = Pr (6), Gd (7)} have been synthesized through the hydrothermal synthesis method. These compounds possess non-interpenetrating 3D networks with 10.1438 Å × 17.9149 Å rhombic channels along the [001] direction. The results of temperature-dependent magnetic susceptibility measurements indicate that compounds 4 and 7 exhibit LnIII⋯LnIII antiferromagnetic interactions, while compound 5 exhibits LnIII⋯LnIII ferromagnetic interactions. Frequency dependent out-of-phase signals were observed in alternating current (ac) magnetic susceptibility measurements which indicate that they have slow magnetic relaxation characteristics. The luminescent properties of 1, 2, 3, 4, and 5 are also discussed. Due to the good match between the lowest triplet state of the ligand and the resonant energy level of the lanthanide ion, compound 4 has longer fluorescence lifetime (τ1 = 400.0000 ms, τ2 = 1143.469 ms) and higher quantum yield (Φ = 42%) compared with other compounds.

A series of metal–organic framework {Ln(BCPBA)(H2O)}n {Ln = Nd (1), Sm (2), Eu (3), Tb (4), Dy (5)}; {[Ln(BCPBA)(H2O)](H2O)}n {Ln = Pr (6), Gd (7)} have been synthesized through the hydrothermal synthesis method. These compounds possess non-interpenetrating 3D networks with 10.1438 Å × 17.9149 Å rhombic channels along the [001] direction. The results of temperature-dependent magnetic susceptibility measurements indicate that compounds 4 and 7 exhibit LnIII⋯LnIII antiferromagnetic interactions, while compound 5 exhibits LnIII⋯LnIII ferromagnetic interactions. Frequency dependent out-of-phase signals were observed in alternating current (ac) magnetic susceptibility measurements which indicate that they have slow magnetic relaxation characteristics. The luminescent properties of 1, 2, 3, 4, and 5 are also discussed. Due to the good match between the lowest triplet state of the ligand and the resonant energy level of the lanthanide ion, compound 4 has longer fluorescence lifetime (τ1 = 400.0000 ms, τ2 = 1143.469 ms) and higher quantum yield (Φ = 42%) compared with other compounds.