Proton -conducting lanthanide metal-organic frameworks: a multifunctional platform.

Lanthanide metal-organic frameworks (LMOFs) have established themselves as promising proton-conducting materials among all types of porous coordination polymers and covalent organic frameworks. The structural diversity of LMOFs and high oxophilicity with a high coordination number of lanthanide ions make LMOFs a standout material for proton conduction. In the last few years, ample research efforts have been devoted to designing and developing proton-conducting lanthanide metal-organic frameworks (PCLMOFs).

Levamisole Based Co(II) Single-Ion Magnet.

A new Co(II) complex, [Co(NCS)(L)] (1) has been synthesized based on levamisole (L) as a new ligand. Single-crystal X-ray diffraction analyses confirm that the Co(II) ion is having a distorted tetrahedral coordination geometry in the complex. Notably strong intramolecular S⋅⋅⋅S and S⋅⋅⋅N interactions has been confirmed by employing Quantum Theory of Atoms in Molecules (QTAIM).

Exploration of SMM behavior of Ln complexes derived from thianaphthene-2-carboxylic acid.

Two lanthanide-based dinuclear complexes [Ln(L)(DMF)(HO)] (Ln = Dy (1)/Tb (2)) derived from thianaphthene-2-carboxylic acid have been synthesized and characterized in detail. Single-crystal XRD analyses confirm that the centro-symmetric discrete dimeric structures contain eight-coordinated lanthanide centers with biaugmented trigonal prism geometry in the complexes. Magnetic studies reveal the presence of antiferromagnetic interaction as well as thermal depopulation of Stark sublevels with a decrease in temperature for both complexes, whereas prominent field-induced single-molecule magnet behavior was observed for 1.

Anion-driven structures and SMM behavior of dinuclear terbium and ytterbium complexes.

The work in this present investigation reports the syntheses, crystal structures and magnetic properties of five dinuclear lanthanide complexes having compositions [Tb2(HL)4(NO3)6] (1), [Tb2(HL)4Cl6]·2EtOH (2), [Yb2(HL)4(NO3)6] (3), [Yb2(HL)4Cl6]·2EtOH (4) and [Y2(HL)4(NO3)6] (5) with HL = 8-hydroxyquinaldine. It is evident from the crystal structures that the coordination number of trivalent lanthanide ions in compounds 1, 3 and 5 is nine, whereas that for compounds 2 and 4 is six. A dynamic magnetic study shows that both compounds 1 and 3 exhibit single-molecule-magnet (SMM) behavior while compounds 2 and 4 do not have any SMM property.

Syntheses, crystal structures and steady state and time-resolved fluorescence properties of a PET based macrocycle and its dinuclear Zn/Cd/Hg complexes.

The work in the present investigation reports the syntheses, crystal structures, ESI-MS (positive) and steady state and time resolved photophysical properties of a tetraaminodiphenol macrocyclic ligand HL (saturated analogue of a tetraiminodiphenol macrocycle obtained on 2 + 2 condensation of 4-ethyl-2,6-diformylphenol and 2,2-dimethyl-1,3-diaminopropane) and its three dinuclear d metal ion (Zn, Cd and Hg) complexes having compositions [ZnLCl]·2CHOH (1), [CdL(μ-HO)(HO)](NO)·4HO (2) and [HgLCl] (3). HL is colorless and weakly fluorescent, Cd compound 2 is colorless and more weakly fluorescent, Zn compound 1 is colorless and highly fluorescent and Hg compound 3 is yellow and nonemissive. The order of the radiative rate constant (K), obtained from time-resolved studies, corroborates the order of quantum yields, obtained from steady state studies: 1 (φ = 0.

Unprecedented dinuclear Robson type macrocyclic complexes having two +iii metal ions in two compartments and the role of the diimino moiety on the stability of metal ion oxidation states.

The work in this investigation deals with the syntheses, characterization, crystal structures and catechol oxidase activity of four diphenoxo-bridged Co(III)Co(III) compounds of composition [Co(III)Co(III)L(Me-pn)(N3)4]·6H2O (), [Co(III)Co(III)L(Me-pn)(N3)4]·4H2O (), [Co(III)Co(III)L(Et-pn)(N3)4]·3.5H2O () and [Co(III)Co(III)L(Et-pn)(N3)4]·CH3CN·2.5H2O (), and two diphenoxo-bridged Co(III)Co(II) compounds of composition [Co(III)Co(II)L(Me-Me2pn)(N3)3]·2H2O () and [Co(III)Co(II)L(Et-Me2pn)(N3)3]·H2O ().

Syntheses, structures, and steady state and time resolved photophysical properties of a tetraiminodiphenol macrocyclic ligand and its dinuclear zinc(II)/cadmium(II) complexes with coordinating and noncoordinating anions.

The work in the present investigation reports the syntheses, structures, steady state, and time-resolved photophysical properties of a tetraiminodiphenol macrocyclic ligand H(2)L and its eight dinuclear zinc(II) complexes and one cadmium(II) complex having composition [Zn(2)L(H(2)O)(2)](ClO(4))(2)·2CH(3)CN (1), [Zn(2)L(H(2)O)(2)](ClO(4))(2)·2dmf (2), [Zn(2)L(H(2)O)(2)](NO(3))(2)·2dmf (3), [Zn(2)LCl(2)] (4), [Zn(2)L(N(3))(2)] (5), [Zn(2)L(NCS)(2)] (6), [Zn(2)L(NCO)(2)] (7), [Zn(2)L(NCSe)(2)](2)·dmf (8), and [Cd(2)L(OAc)(2)] (9) with various coordinating and noncoordinating anions. The structures of all the complexes 1-9 have been determined by single-crystal X-ray diffraction. The noncovalent interactions in the complexes result in the generation of the following topologies: two-dimensional network in 1, 2, 4, 6, 7, 8, and 9; three-dimensional network in 5.