Yanyuan Jia

Conversion from a heterochiral [2 + 2] coaxially nested double-helical column to a cationic spiral staircase stimulated by an ionic liquid anion.

The conversion from a [2 + 2] nested double-helical column, {[Mn2(ptptp)(suc)(H2O)2]·1.5H2O}n (1), to a cationic spiral staircase, {[Mn2(ptptp)(suc)0.5(H2O)3]·Br·0.5H2O}n (2), has been achieved through ionic liquid anion stimulations under solvothermal conditions. The conversion does not change the antiferromagnetic interactions.

Crystal to crystal transformation induced a novel Cu(II)-MOF with zigzag ⋯I3−⋯I3−⋯ chains

A novel Cu(II)-MOF {[Cu4(TTTMB)4(NO3)4(H2O)5]·(NO3)2·(I3)2·H2O}n containing polyiodide I3− was obtained through crystal to crystal transformation by immersing a CdII complex {[Cd3(TTTMB)4I2]·I4}n in an aqueous solution of Cu(NO3)2. There are two kinds of I3− arranged as infinite zigzag ⋯I3−⋯I3− chains between the layers of the Cu(II)-MOF.

Syntheses, structures, and fluorescent properties of two helical complexes based on a long rigid N-heterocyclic ligand

A long N-heterocyclic ligand, 2,6-bis(3-(pyrid-3-yl)-1,2,4-triazolyl)pyridine (H2bptp), and Zn(II)/Pb(II) yield {[Zn(bptp)(H2O)] · 2H2O·CH3CN} n (1) and {[Pb(bptp)] · H2O} n (2). Single-crystal X-ray diffraction analysis reveals that 1 and 2 possess 2-D networks containing alternating left- and right-handed helical motifs. Topologically, 1 features a (4,4) topology, while 2 exhibits a (6,3) topology. The bptp2− in 1 and 2 adopts syn-anti and syn-syn conformations, respectively. The results indicate that the long rigid N-heterocyclic ligand can adopt different conformations to coordinate with metals, beneficial to construction of helical structures with diverse topologies. The difference between the photoluminescence properties of the two complexes reveals that metal ions and coordination environment have significant influences on photoluminescence behavior.

Nuclearity control of manganese polymers dependent on structural differences in the coligands and magnetic properties studies

A series of polymers containing MnII clusters varying from dinuclear, tetranuclear, hexanuclear, to rod-shaped uniform chains has been synthesized. The polymer [Mn4(Htci)2(ptptp)2(H2O)6]·8H2O (1) (H3tci = tris(2-carboxyethyl)isocyanurate, H2ptptp = 2-(5-{6-[5-(pyrazin-2-yl)-1H-1,2,4-triazol-3-yl]pyridin-2-y-1H-1,2,4-triazol-3-yl}pyrazine) shows an interesting ladder based on dinuclear Mn clusters. The polymer {[Mn3(tci)2(pbbm)(H2O)3]·H2O}n (2) (pbbm = 1,1′-(1,5-pentanediyl)bis-1H-benzimidazole) has a 2D 3,6-connected framework with tetranuclear and dinuclear Mn clusters. The polymer {[Mn3(tci)2(bbbm)(H2O)3](H2O)}n (3) (bbbm = 1,1′-(1,4-butanediyl)bis-1H-benzimidazole) belongs an uncommon 3D 3,12-connected framework assembled by hexanuclear clusters. And the polymer {Mn(Htci)(dpp)}n (4) (dpp = 1,3-di(4-pyridyl)propane) based upon rod-shaped uniform Mn chains exhibits a 2D framework. Magnetic susceptibility measurements indicate that all of the polymers show weak antiferromagnetic interactions.