Hai-Yang Zhang

Bio: Hai-Yang Zhang is an academic researcher from Guilin University of Technology. The author has contributed to research in topics: Crystal structure & Cubane. The author has an hindex of 5, co-authored 11 publications receiving 105 citations.

Structural variation from heterometallic heptanuclear or heptanuclear to cubane clusters based on 2-hydroxy-3-ethoxy-benzaldehyde: effects of pH and temperature

Abstract: Five new Hheb complexes, HN(C2H5)3·[M4Na3(heb)6(μ3-N3)6], (M = Ni (1), and Co (2), [Co4(heb)4(μ3-OCH3)4(μ1-HOCH3)4]·(H2O)2 (3), [M7(heb)6(μ3-OCH3)6]·(ClO4)2 (M = Ni (4), and Co (5), Hheb = 2-hydroxy-3-ethoxy-benzaldehyde), were synthesized by reaction of hexahydrate perchlorate salt, Hheb, and NaN3 under different temperature and pH conditions. Careful investigation of the effect of the reaction temperature and pH resulted in a series of compounds with different compositions and nuclearities. The diverse compounds obtained illustrate the marked sensitivity of the structural chemistry of Co- or Ni-Hheb ligand-like systems to synthesis conditions. Complexes 1 and 2, which are heterometallic heptanuclear anion [M4Na3(heb)6(N3)6]− clusters, are formed at a pH of 5.5 and at room temperature. At a pH of 7.5 and at room temperature, a neutral molecular cubane cluster, namely 3, is formed with a lower nuclearity. Further increase of the reaction temperature to 140 °C at the same pH resulted in formation of two heptanuclear cation [M7(heb)6(μ3-OCH3)6]2+ clusters, 4 and 5. The results show that the pH and reaction temperatures play a key role in the structural control of the self-assembly process. Interestingly, heterometallic heptanuclear anion [M4Na3(heb)6(N3)6]− clusters have never been reported for the family of μ3-N3− or μ3-O-bridged heptanuclear clusters. The magnetic properties of 1–5 were investigated and are discussed in detail.

Microwave-assisted Synthesis, Structure, and Properties of a Heptanuclear Cobalt Cluster with 2-Ethyliminomethyl-6-methoxy-phenol†

Abstract: The heptanuclear cobalt cluster [Co7(emmp)6(CH3O)6]·(ClO4)2 (1) (Hemmp = 2-ethyliminomethyl-6-methoxy-phenol) was synthesized by the microwave-assisted reaction of Co(ClO4)2·6H2O with 3-ethoxy-2-hydroxy-benzaldehyde (Hehb) and ethylamine in mixed solvent (acetonitrile:methanol = 1:1). Complex 1 was characterized by IR spectroscopy, elemental analysis, and X-ray single-crystal diffraction. The magnetic properties of 1 are discussed. Complex 1 displays dominant ferromagnetic interactions from the nature of the binding modes through μ3-OCH3 and μ2-phenoxo.

Room Temperature Syntheses, Structures and Magnetic Properties of Two Heterometallic Tetranuclear Clusters

Abstract: Two new heterometallic tetranuclear clusters [M2Na2(hmb)4(N3)2(CH3CN)2]·(CH3CN)2 (M = Ni (1), M = Co (2), Hhmb is 2-hydroxy-3-methoxy-benzaldehyde) have been synthesized at room temperature and structurally characterized by elemental analysis, IR spectroscopy, and single crystal X-ray diffraction. Intracluster, compounds 1 and 2 display dominant ferromagnetic interaction through double μ 1,1,1-N3 bridges, while intercluster, 1 and 2 display weak anti-ferromagnetic interaction and ferromagnetic interaction, respectively.

Cobalt Cubane Clusters Based on Schiff Base: Synthesis, Characterization, Magnetic Properties and Hirshfeld Surface Analysis

Abstract: Three cobalt cubane clusters with the composition of [Co4(L)4], (1, H2L is 1-{3-[(3,5-dibromo-2-hydroxy-benzylidene)-amino]-2-hydroxy-phenyl}-ethanone (H2DBHBA); 2, H2L is 1-{3-[(5-bromo-2-hydroxy-benzylidene)-amino]-2-hydroxy-phenyl}-ethanone (H2BHBA); 3, H2L is 1-{3-[(3,5-dichloro-2-hydroxy-benzylidene)-amino]-2-hydroxy-phenyl}-ethanone (H2DCHBA)), were prepared by the reaction of cobalt nitrate hexahydrate with 2-hydroxy-benzaldehyde ramification under solvothermal conditions. All the complexes were characterized by elemental analysis, infrared spectroscopy, and X-ray single-crystal diffraction. Complexes 1–3 have tetranuclear clusters with a cubane topology in which the metal ions and the oxygen atoms from the L ligands occupying the alternate vertices of the cubane. The {Co4O4} cores display dominant anitferromagnetic interactions owing to the μ3-O bridged binding modes. Hirshfeld surface analysis revealed that H···H, and C···X (X = Br or Cl) interactions were the dominant intermolecular interactions.

Two-Dimensional Metal-Organic Framework Materials: Synthesis, Structures, Properties and Applications.

Abstract: Among the recent developments in metal-organic frameworks (MOFs), porous layered coordination polymers (CPs) have garnered attention due to their modular nature and tunable structures. These factors enable a number of properties and applications, including gas and guest sorption, storage and separation of gases and small molecules, catalysis, luminescence, sensing, magnetism, and energy storage and conversion. Among MOFs, two-dimensional (2D) compounds are also known as 2D CPs or 2D MOFs. Since the discovery of graphene in 2004, 2D materials have also been widely studied. Several 2D MOFs are suitable for exfoliation as ultrathin nanosheets similar to graphene and other 2D materials, making these layered structures useful and unique for various technological applications. Furthermore, these layered structures have fascinating topological networks and entanglements. This review provides an overview of different aspects of 2D MOF layered architectures such as topology, interpenetration, structural transformations, properties, and applications.

Highly efficient electrochemiluminescence based on 4-amino-1,2,4-triazole Schiff base two-dimensional Zn/Cd coordination polymers

Abstract: Four coordination polymers, formulated as [Zn(L1)2]n (1), [Cd(L1)2]n (2), [Zn(L2)2]n (3) and [Cd(L2)2]n (4) (HL1 is (E)-2-(((4H-1,2,4-triazol-4-yl)imino)methyl)-4,6-dibromophenol; HL2 is (E)-2-(((4H-1,2,4-triazol-4-yl)imino)methyl)-4,6-dichlorophenol) have been synthesized through vial reactions. The four compounds were structurally characterized by single crystal X-ray diffraction, elemental analysis, PXRD, and fluorescence spectroscopy. For 1–4, a detailed analysis of Hirshfeld surfaces and fingerprint plots facilitates a comparison of intermolecular interactions, which are crucial in building different supramolecular architectures. C–H⋯X (X = Br, Cl) interactions play a crucial role in stabilizing the self-assembly process among adjacent 2-D networks for both complexes. Above all, complexes 1–4 showed highly intense electrochemical luminescence (ECL) in DMF solution and high thermal stability.

Structural variation from heterometallic heptanuclear or heptanuclear to cubane clusters based on 2-hydroxy-3-ethoxy-benzaldehyde: effects of pH and temperature

Abstract: Five new Hheb complexes, HN(C2H5)3·[M4Na3(heb)6(μ3-N3)6], (M = Ni (1), and Co (2), [Co4(heb)4(μ3-OCH3)4(μ1-HOCH3)4]·(H2O)2 (3), [M7(heb)6(μ3-OCH3)6]·(ClO4)2 (M = Ni (4), and Co (5), Hheb = 2-hydroxy-3-ethoxy-benzaldehyde), were synthesized by reaction of hexahydrate perchlorate salt, Hheb, and NaN3 under different temperature and pH conditions. Careful investigation of the effect of the reaction temperature and pH resulted in a series of compounds with different compositions and nuclearities. The diverse compounds obtained illustrate the marked sensitivity of the structural chemistry of Co- or Ni-Hheb ligand-like systems to synthesis conditions. Complexes 1 and 2, which are heterometallic heptanuclear anion [M4Na3(heb)6(N3)6]− clusters, are formed at a pH of 5.5 and at room temperature. At a pH of 7.5 and at room temperature, a neutral molecular cubane cluster, namely 3, is formed with a lower nuclearity. Further increase of the reaction temperature to 140 °C at the same pH resulted in formation of two heptanuclear cation [M7(heb)6(μ3-OCH3)6]2+ clusters, 4 and 5. The results show that the pH and reaction temperatures play a key role in the structural control of the self-assembly process. Interestingly, heterometallic heptanuclear anion [M4Na3(heb)6(N3)6]− clusters have never been reported for the family of μ3-N3− or μ3-O-bridged heptanuclear clusters. The magnetic properties of 1–5 were investigated and are discussed in detail.

Diverse Structures Based on a Heptanuclear Cobalt Cluster with 0D to 3D Metal–Organic Frameworks: Magnetism and Application in Batteries

Abstract: Polymetallic complexes with interesting multifunctions have attracted extensive investigation. Synthesized through the use of different cobalt salt anions and solvents, five complexes, namely [CoII4 CoIII3 (H2 L)3 Cl5 (MeOH)] (1), [CoII4 CoIII3 (H2 L)3 (CH3 COO)4 (HCOO)⋅H2 O]n (2), [CoII4 CoIII3 (H2 L)3 (HCOO)4 (NO3 )⋅2H2 O]n (3), [CoII4 CoIII3 (H2 L)3 (bda)(CH3 COO)4 ⋅2H2 O]n (4), and [CoII4 CoIII3 (H2 L)3 (ipa)(HCOO)3 (dmf)⋅H2 O]n (5) (H6 L=bis-tris propane; BDA=biphenyl-4,4'-dicarboxylic acid; IPA=isophthalic acid; DMF=N,N-dimethylformamide), based on the heptanuclear {CoII4 CoIII3 } cluster with structures from 0D to 3D metal-organic frameworks (MOFs) have been solvothermally synthesized. Compound 1 is the first 0D heptanuclear cluster based on H6 L. Compound 2 crystallizes in the chiral space group P21 21 21 and consists of a 1D chiral helical chain. Complex 3 exhibits a 3D network structure. Compound 4 possesses a 1D zigzag-like chain structure. Finally, compound 5 was obtained as a 3D microporous structure. Compounds 1, 3, and 4 display dominant ferrimagnetic interactions whereas compounds 2 and 5 exhibit antiferromagnetic interactions. Moreover, the Co3 O4 prepared by calcining compound 2 presents a reversible capacity of 1122.9 mA h g-1 at 0.2 A g-1 after 100 cycles and an excellent rate capability, which suggests that coordination compounds with a 1D chain structure are outstanding precursors for preparing anode materials for lithium ion batteries.