Wei-Ping Wu

A Zn(II) luminescent polymer as a multifunctional sensor to nitrobenzene, Fe3+ and CrO42− ions

Abstract A metal-organic framework of {[Zn(tib)2]·2NO3} (tib = 135-tris(1-imidazolyl)benzene) (1) has been synthesized and characterized. The structure determination reveals that 1 is a 2-D layer network and exhibits a classical hxl topology. 1 shows selective properties in the detection of nitrobenzene and Fe3+. Furthermore, 1 also exhibits an excellent capability to detect CrO42−. The present work indicates that 1 could be taken as a potential candidate for developing multifunctional luminescence sensors.

Syntheses, structural and luminescence study on a new 1D Zn(II) complex with hydrazine-based ligand

A new Zn-based complex with chemical formulae {[Zn2(L)2(4,4′-bipy)]·DMF}n (1) (H2L = 3,5-dibromosalicylaldehyde salicylhydrazone; 4,4′-bipy = 4,4′-pyridine), has been synthesized and structurally characterized. 1 shows an interesting double zigzag chain along the b axis. Furthermore, the luminescence property of compound 1 has been investigated.

Syntheses and luminescence of four supramolecular coordination complexes with flexible ligand

Four d10-based complexes with chemical formulae {[Zn(L1)2(H2O)2(4,4′-Bipy)2] (I), {[Zn2(L1)4(Mi)] · 4H2O} (II), {[Zn(L1)2(Phen)] · H2O} (III) {[Cd(L1)2(Phen)] · 2H2O} (IV) (HL1 = p-hydroxy phenylacetic acid, 4,4′-Bipy = 4,4′-bipyridine, Phen = 1,10-phenanthroline, Mi = 1,4-bis(imidazol-1-yl)butane) have been synthesized and structurally characterized by single crystal X-ray diffraction (CIF files CCDC nos. 1047119 (I), 1047120 (II), 1047121 (III), 1047122 (IV)). The significant effect of assistant ligands and metal ions on assembly of I‒IV has been demonstrated, which leads to the formation of distinct crystalline products. Complexes I‒IV show various coordination motifs with different existing forms and coordination modes of the organic ligands. Furthermore, extend supramolecular networks are connected by secondary interactions such as hydrogen-bonding and aromatic stacking. The thermal stability and luminescent properties of the compounds were discussed in detail.

Synthesis, crystal structure, and luminescent property of a discrete Zn3L3 metallomacrocycle constructed from 5-hydroxyisophthalic acid

An interesting discrete metallomacrocycle (MMC), [Zn3(L)3(H2O)6] · H2O (I), has been prepared by means of self-assembly of Zn(II) salt, 5-hydroxyisophthalic acid (H2L) as organic linker and 5,5’-(pyridine-2,6-diyl)diisophthalic acid (H4L’) as structure-directing agentunder hydrothermal condition. In complex I, the planar trinuclearmetal-organic macrocycles are arranged into 2D sheet layers connected by strong hydrogen bonded between OH groups of the ligands. Then they stack into 3D supramolecular architecture in–ABAB–array way to give a small 1D open channel along the c axis (CIF file CCDC no. 1053024). Additionally, thermal stability and luminescence properties of I were also investigated.

Two Chemically Stable Cd(II) Polymers as Fluorescent Sensor and Photocatalyst for Aromatic Dyes

Two new 2D Cd(II)-based coordination polymers (CPs), viz. [Cd2(H2L)2(2,2’-bipy)2] (1) and [Cd(L)0.5(phen)·0.5H2O] (2), have been constructed using ethylene glycol ether bridging tetracarboxylate ligand 5,5′(4,4′-phenylenebis(methyleneoxy)) diisophthalic acid (H4L). Both CPs behaved as profound fluorescent sensor for Fe3+ ion and nitro-aromatics (NACs), specifically 2,4,6-trinitrophenol (TNP). The stability at elevated temperature and photocatalytic behaviors of both 1 and 2 for photo-decomposition of aromatic dyes have also been explored. An attempt has been made to explore the plausible mechanism related with the decrease in fluorescence intensity of 1 and 2 in presence of NACs using theoretical calculations. Additionally, the probable mechanism of photo catalysis by 1 and 2 to photo-degrade aromatic dyes has been explained using density of states (DOS) calculations.

A 2D Co(II) coordination polymer based on 1,3,5-tris(1H-imidazol-1-yl)benzene: photocatalytic properties and theoretical analysis

Abstract A new 2D Co(II) based coordination polymer (CP), {[Co2(tib)2(NO3)3(H2O)2·NO3]n (1), has been synthesized using 1,3,5-tris(1-imidazolyl)benzene (tib) ligand. The single crystal X-ray diffraction study indicates that 1 possesses an infinite 2D layer, which is further extended into a 3D supramolecular network via O–H···O hydrogen bonding interactions. Additionally, the thermogravimetric analysis (TGA) of CP indicates its decomposition temperature was about 268 °C. The UV/Vis diffuse-reflection spectrum of 1 indicates its semiconducting nature on the basis of which the photocatalytic properties of 1 against photodecomposition of organic dyes have been studied. The possible mechanism associated with the photocatalytic activity of 1 against organic dyes is addressed using density of states (DOS) calculations. Graphical Abstract

Fabrication of a new metal–organic framework for sensitive sensing of nitroaromatics and efficient dye adsorption

The hydrothermal reaction of Cd(II) salt with rigid tetracarboxylate ligand, terphenyl-3,3′′,5,5′′-tetracarboxylic acid (H4L) produced a new metal–organic framework (MOF) {[Cd2(L)(DMF)3]·0.5DMF}n (1). Single crystal X-ray diffraction showed that MOF 1 possesses a 3D microporous framework with 4-connected Dia topology which is based on {Cd2(CO2)4} subunits. MOF 1 is a promising dual functional sensor with high selectivity and sensitivity for the detection and recognition of nitroaromatics (NACs) and Fe3+ ions via alleviation of its fluorescence intensity. Furthermore, 1 also has an excellent capacity to adsorb methylene blue (MB) with high selectivity, and it retains almost similar adsorption performance after being recycled several times. The observed decrease in fluorescence intensity of 1 in the presence of NACs has been addressed by theoretical calculations which indicate that the intensity alleviation of 1 in the presence of NACs can be attributed to an electron and resonance energy transfer between 1 and nitro analytes.

Synthesis, Hirshfeld surface analyses and magnetism of a 1D Mn(II) complex

A new Mn-based complex of {[Mn(L) 2 (mi)]·H 2 O} n ( 1 ) (HL = p -hydroxy phenylacetic acid; mi = 1,1’-(1,4-butanediyl)bis(imidazole)), has been synthesized and structurally characterized. Single-crystal X-ray analyses reveal that compound 1 has a dinuclear Mn(II) unit linking by four carboxylate groups. The bridging N-donor ligand with mi links the Mn(II) centers into a 1D double chain. The detailed analyses of Hirschfeld surface and fingerprint plots provide insight into the nature of non-covalent interactions in the title compound. Furthermore, an attempt was made to explain the magnetic property of compound 1 using atoms in molecule (AIM) theory. KEY WORDS : Supramolecular architecture, Hirschfeld surface analysis, Magnetism Bull. Chem. Soc. Ethiop. 2016 , 30(1), 111-118. DOI: http://dx.doi.org/10.4314/bcse.v30i1.10

Hirshfeld surface analysis of a Zn(II) polymer

A new Zn-based complex with oxalate, namely [NH2(CH3)2][Zn(Ox)1.5] · DMF · H2O (I) (Ox = oxalate), has been synthesized and structurally characterized. Single-crystal X-ray analysis of compound I reveals that the Ox ligand links the Zn(II) center, generating an intricate 2D classical honeycomb-like architecture (CIF file CCDC no. 1028787). The detail analyses of Hirschfeld surface and fingerprint plots gave a mode of non-covalent interactions in the title compound.

A new 2D Mn(II) coordination polymer constructed from carboxylate and N-donor coligand: Synthesis, structure, and magnetism

A new complexes, namely, {[Mn2(L)2(Bipy)2] · H2O}n (I) (H2L = diphenic acid, Bipy = 4,4′-bipyridine) has been synthesized and structurally characterized by single-crystal diffraction analysis. In I, the two syn, anti-carboxylate groups in L bridge Mn(II) forming a one-dimensional chain, which is further connected by Bipy into 2D double layer. Magnetic study reveals the overall antiferromagnetic interaction between neighboring Mn2+ ions in compound I.