Zhan-Quan Liu

A pentanuclear complex derived from manganese(III) Schiff-based complex and hexacyanoferrate(III): synthesis, structure and magnetic properties

Abstract A cyano-bridged MnIII–FeIII complex, [Mn(salpn)(CH3OH)]4·[Fe(CN)6]ClO4·9(H2O), was prepared and characterized. Single crystal X-ray analysis reveals that the complex assumes a cyano-bridged Mn4Fe unit. The magnetic measurement showed this complex exhibiting ferromagnetic behavior.

A new mixed-ligand copper(II) complex containing azide and 1,10-phenanthroline: crystal structure and properties

A new copper complex, [Cu(phen)2N3]ClO4 (phen = 1,10-phenanthroline), has been synthesized and characterized by X-ray single-crystal structure analysis. The copper atom is five-coordinated with four nitrogen atoms of two phens and one nitrogen atom of the azide to form an intermediate coordination geometry distorted from trigonal bipyramidal (TBP) and square pyramidal (SP). The extended three-dimensional structure is formed through π–π interactions and hydrogen bonds. The IR spectrum, electronic spectrum, magnetic properties and ESR spectrum of the title compound have been studied.

Synthesis, crystal structures and luminescent properties of two supramolecular assemblies containing [Au(CN)2]- building block

Two self-assembled supramolecular architectures {{MnH2O(Phen)2[Au(CN)2]}[Au(CN)2]·0.5C2H5OH·0.5H2O}n (phen = 1, 10-phenanthroline) (1) and [C6H13N4][Au(CN)2]·H2O(C6H13N4 = 4-amide-3, 5-diethyl-1, 2, 4-triazole cation) (2) have been synthesized and structurally characterized. X-ray crystallography revealed a three-dimensional structure of 1 formed by the incorporation of coordinative linkage, aurophilic, hydrogen-bonding and π–π interactions. The 2D structure of 2 is formed by aurophilic and hydrogen-bonding interactions. Both the solid phases and aqueous solutions of 1 and 2 display interesting luminescence at room temperature.

Two [Au(CN)2]−-bridged heterometallic coordination polymers directed by different 2,2′-bipyridyl-like ligands

Two new cyanide-bridged heterobimetallic coordination polymers constructed by using the [Au(CN)2]− building block, {Cd(bipy)[Au(CN)2]2}n (1) and {{Cd(phen)[Au(CN)2]2(H2O)}·iPrOH}n (2) (bipy = 2,2′-bipyridine, phen = 1,10-phenanthroline), have been synthesized and characterized. Complex 1 with chiral P3112 space group exhibits a novel three-fold interpenetrating quartz-like 3-D network, which is completely unsupported by aurophilic interactions, while complex 2 with the replacement of bipy by phen shows C2/c space group and features the 1-D zigzag chain structure and an extended supramolecular 2-D array in which aurophilic interactions may play an important role in sustaining the supramolecular solid-state architectures. 1 and 2 feature various networks most likely due to the different steric hindrances of the bipy and phen ligands. In addition, the solid state photoluminescence spectrum of complex 2 exhibits a strong green emission band (λmax = 524 nm) at room temperature.

A 2-D ladder-type polymer, Mn2(NIT2-thz)2Cl4(H2O)2: synthesis, crystal structure and magnetic properties

Abstract A novel Mn(II)-nitronyl nitroxide-substituted thiazole complex Mn2(NIT2-thz)2Cl4(H2O)2 (NIT2-thz=2-(2′-thiazole)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide) was synthesized and characterized structurally and magnetically. It crystallizes in the orthorhombic space group Pbca. The complex has dimeric structure where two manganese ions are doubly bridged by chloride ions. Each manganese ion is in a distorted octahedral environment. The complex molecules were connected as two-dimensional ladder-type structure by the intermolecular interaction. Magnetic measurements show that there are three kinds of antiferromagnetic interactions in the compound.

3D porous and 3D interpenetrating triple framework structures constructed by aurophilicity-coordination interplay in {Mn[Au(CN)2]2(H2O)2}n and {KFe[Au(CN)2]3}n

Two cyano-bridged heterobimetallic coordination polymers [Mn[Au(CN)2]2(H2O)2]n (1) and [KFe[Au(CN)2]3]n (2), have been synthesized from [Au(CN)2]- building blocks and structurally characterized. In both complexes aurophilicity play an important role in determining the 3D open microporous framework and the interpenetrating triple framework for 1 and 2, respectively. Both aqueous solutions of 1 and 2 display interesting luminescent properties.

Syntheses, properties and X-ray structures of [Ni(ntb)(N3)2]·CH3OH and [Cu(ntb)(SCN)]Cl·3CH3OH (ntb = tris(2-benzimidazolylmethyl)amine)

The complexes [Ni(ntb)(N3)2]·CH3OH (1) and [Cu(ntb)(SCN)]·3CH3OH (2), where ntb = tris(2-benzimidazolylmethyl)amine, were synthesized and their crystal structures determined. Complex 1 is monoclinic, space group P21/c space group with a = 12.777(4), b = 9.928(3), c = 21.623(7) Å, β = 103.145(6)°. The central Ni(II) ion is coordinated to four nitrogen atoms of ntb and two N ions with slightly distorted octahedral geometry. Complex 2 crystallizes triclinic, space group P , with a = 11.11(2), b = 13.18(3), c = 13.52(3) Å, α = 63.97(3), β = 66.32(3), γ = 85.55(3)°. Cu(II) is five-coordinate with an N5 ligand donor set comprising four nitrogen atoms of ntb and a nitrogen-bonded SCN− ion, and adopts distorted square pyramidal geometry. In the complexes, hydrogen bonds and π···π interactions are important in stabilising three-dimensional networks. IR, electronic and ESR spectra are discussed, together with magnetic properties at room temperature.

Synthesis, structure and spectroscopic properties of CuL(MeOH), H2L = (E)-N 1-(2-((2-aminocyclohexydiimino)(phenyl)methyl)-4-chlorophenyl)-N 2-(2-benzyl-4-chlorophenyl)oxalamide

A new kind of copper(II) complex, CuL(MeOH) (H2L = (E)-N 1-(2-((2-aminocyclohexydiimino)(phenyl)methyl)-4-chlorophenyl)-N 2-(2-benzyl-4-chlorophenyl)oxalamide) has been synthesized and its structure determined by single-crystal X-ray methods. Copper(II) ion is five-coordinate, bonding to four nitrogen atoms from H2L and one oxygen atom from MeOH. Hydrogen bonds in the crystal result in the formation of a one-dimensional structure. EPR spectra are discussed. Computer simulation gave g|| = 2.200, g⊥ = 2.002. On the basis of the synthesis and the crystal structure, the mechanism of the metal template reaction involved in the formation of the complex was verified.

Synthesis, structure and spectroscopy of a copper complex of the chiral pendant-arm macrocycle N,N′,N′′-tris[2S-2-hydroxypropyl]- 1,4,7-triazacyclononane

The preparation, crystal structure and spectroscopy of [Cu(H3L)](ClO4)2] (H3L = N,N′,N′′-tris[2S-hydroxypropyl]-1,4,7-triazacyclononane) is presented. The complex crystallizes in the monoclinic space group P21/c, a = 13.954(5), b = 9.700(4), c = 17.883(7) Å, β = 99.548(8)°, Z = 4; R1 = 0.0665, wR2 = 0.1826. The central copper ion is coordinated to three nitrogen atoms of the macrocycle and three oxygen atoms from the pendant hydroxypropyl groups, forming a distorted octahedral coordination sphere.

Heteropolymetallic Supramolecular Solid-State Architectures Constructed from Dicyanoaurate Ion, Phen, and 3d Metals

Two new supramolecular polymeric coordination complexes, {Zn(phen)2[Au2(CN)4](H2O)}·1.5H2O 1 and {Mn(phen)[Au2(CN)4](H2O)}·PriOH 2, have been obtained through a self-assembly process. The three-dimensional supramolecular architectures of compounds 1 and 2 are sustained by aurophilic, hydrogen-bonding, and/or π–π interactions. Gold atoms linked with aurophilic bonds arrange in a pattern not frequently observed.