Man-Hua Ding

Bio: Man-Hua Ding is an academic researcher from Hunan University of Science and Engineering. The author has contributed to research in topics: Coordination geometry & Polyoxometalate. The author has an hindex of 1, co-authored 2 publications receiving 4 citations.

Synthesis and structure of a one- and a three-dimensional material constructed from molybdenum phosphates and macrocyclic metal complexes

Abstract: Two new polyoxometalate-based materials, [CuL]2[H2Mo5P2O23]·2H2O·2CH3CN (1) and [NiL]2[H2Mo5P2O23]·10H2O (2) (L = 5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraaza-cyclotetradecane), have been isolated from the reactions of [CuL](ClO4)2 and [NiL](ClO4)2 with (NH4)6Mo7O24, respectively, and structurally characterized. Single-crystal X-ray diffraction analysis of 1 showed that clusters of [H2Mo5P2O23]4− bridge [CuL]2+ to form 1-D chains, with O–H O and N–H O hydrogen bonding interactions forming a 3-D framework. The structure of 2 showed a 3-D network structure constructed from [H2Mo5P2O23]4− clusters bridging [NiL]2+, generating 1-D channels occupied by guest water molecules.

CO 2 fixation by macrocyclic nickel(II) complexes: synthesis and structures of helical chains constructed via hydrogen bonds involving imidazole

Abstract: Two dinuclear carbonato-bridged nickel(II) complexes formulated as [Ni(rac-L)]2(µ-CO3)(H2O)(im)4(ClO4)2 (1) and [Ni(SS-L)]2(µ-CO3)(H2O)(im)4(ClO4)2 (2) (L = 5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane, im = imidazole) were isolated from the reactions of [Ni(rac-L)](ClO4)2 and [Ni(SS-L)](ClO4)2 with imidazole in the air, respectively, and a hydrocarbonato-coordinated nickel(II) complex formulated as [Ni(rac-L)](HCO3)(ClO4) (3) was reacted with obtained when [Ni(rac-L)](ClO4)2 reacted with l-cysteine under weakly basic conditions in the air. We found that the macrocyclic nickel(II) complexes can easily take up and fix atmospheric CO2 at room temperature. Single-crystal X-ray diffraction analyses revealed of all three complexes that the central Ni(II) atoms all have a six-coordinated distorted octahedral coordination geometry, and the carbonate anion bridges two Ni(II) atoms in a tridentate fashion to form dimers in complexes 1 and 2, and the hydrocarbonate coordinates with Ni(II) in a didentate fashion in complex 3. The monomers of {[Ni(RR-L)]2(µ-CO3)(H2O)}2+/{[Ni(SS-L)]2(µ-CO3)(H2O)}2+ are connected through hydrogen bonds to generate one-dimensional right- and left-handed helical chains in complex 1. The chiral nature of complex 2 has been confirmed by CD spectroscopy.

Vanadium Polyoxoanions within Coordination Polymers Based on a Macrocyclic Nickel Complex: Structural Diversities and Single‐Crystal to Single‐Crystal Transformation

Abstract: Five three-dimensional (3D) coordination polymers, {(NiL)[(NiL)(V16O42)]}n·2nH2O (1), [(NiL)3(VO3)6]n·5nH2O (2), [(NiL)3(V6O18)]n·7nH2O (3), [(NiL)3(V8O23)]n (4), and [(NiL)4(V10O29)]n (5), have been obtained by the reaction of the macrocyclic nickel complex [NiL](ClO4)2 (L = 1,4,8,11-tetraazacyclotetradecane) with NH4VO3 under different conditions. Single-crystal X-ray diffraction analyses revealed that the [VO3]– anion assumes diverse species and structures in these five coordination polymers, including the [V16O42]n4n– sheet, [V6O18]6– ring, [VO3]nn– chain, [VO3]nn– sheet, and [V10O29]n8n– chain. The [V16O42]n4n– sheets, [V6O18]6– rings, [VO3]nn– chains, [VO3]nn– sheets, and [V10O29]n8n– chains are linked together through [NiL]2+ bridges to form the 3D frameworks of 1–5. The single-crystal to single-crystal transformation between 2 and desolvated 2 was successfully realized. Electrochemical measurements indicate that 2 and 4 are potential catalysts for water splitting.

A 2-D organic–inorganic supramolecular layer based on a {P2Mo5} cluster bridged by Mn(II) and pentanuclear fragment linker

Abstract: An organic–inorganic hybrid based on {P2Mo5} clusters, (H2bim)3[{Na0.5(H2O)0.5}2{Mn(OH)4(H2O)2}{Na0.5(H2bim)}2{Mn(H2O)4(P2Mo5O23)2}]·4H2O (1) (bim = 2,2′-biimidazole), was hydrothermally synthesized and characterized by elemental analyses, IR, TG, UV, and single crystal X-ray diffraction analyses. In 1, four Na ions, one Mn, and two bim ligands are linked by four μ–O bridges to form unusual pentanuclear fragments [{Na0.5(H2O)0.5}2{Mn(OH)4(H2O)2}{Na0.5(H2bim)}2]. Each pentanuclear segment links adjacent to four Standberg units to form supramolecular dimer chains, which are further connected by Mn(H2O)4 linkers to yield infinite 2-D layer. Two kinds of cage-like pores are observed in alternating type along the crystallographic b axis in which protonated H2bim ligands fill one sort of pores. Electrochemical and fluorescent properties of 1 have been investigated.

Assembly of three supramolecular compounds based on [P2Mo5O23]6− and Ni(II) complexes

Abstract: Three supramolecular compounds based on [P2Mo5O23]6− and Ni(II)–bim, [Ni(bim)3]3[P2Mo5O23]·2H2O (1), [Ni(Hbim)(bim)2]4[P2Mo5O23]2·3H2O (2), and [Ni(bim)(Hbim)(phen)]2[P2Mo5O23]·7H2O (3) (bim = 2,2′-biimidazole, phen = 1,10-phenanthroline), have been synthesized under hydrothermal conditions and characterized by elemental analysis, single-crystal X-ray diffraction, IR, and TG. All the compounds show 3-D supramolecular networks constructed from weak interactions among free Ni(II) complex, water, and oxygens of [P2Mo5O23]6−. Compound 3 represents the first supramolecular example integrating {Ni(bim)(Hbim)(phen)} with Strandberg-type phosphomolybdate. The compounds display good electrocatalytic activity to reduce hydrogen peroxide and intense fluorescence properties in solution at room temperature.