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Lanzhou, China

Cao J.,Northwest Normal University | Liu J.-C.,Northwest Normal University | Deng W.-T.,Northwest Normal University | Li R.-Z.,CAS Changchun Institute of Applied Chemistry | Jin N.-Z.,Gansu Computing Center
Organic Electronics: physics, materials, applications | Year: 2013

Novel porphyrin-based coordination polymers-isonicotinic acid assemblies via zinc-to-ligand axial coordination approach immobilized on TiO2 electrode surface have been accomplished and enable attainment of impressive improvement of photocurrent response in supramolecular solar cell. © 2013 Elsevier B.V. Source


Cao J.,Northwest Normal University | Liu J.-C.,Northwest Normal University | Deng W.-T.,Northwest Normal University | Li R.-Z.,CAS Changchun Institute of Applied Chemistry | Jin N.-Z.,Gansu Computing Center
Electrochimica Acta | Year: 2013

In this work, a novel acetohydrazide zinc porphyrin-based coordination polymer (CP)-isonicotinic acid self-assembly by metal-ligand axial coordination to modify the nano-structured TiO2 electrode surface has been investigated in photoelectrochemical device. Compared to the assembly based on corresponding zinc porphyrin combined with isonicotinic acid by metal-ligand axial coordination, CP-isonicotinic acid assembly exhibits a significantly enhanced photoelectronic behavior. In addition, a series of different organic acid ligands were prepared to probe the impact of their structures on the photoelectronic performances of their corresponding assemblies-sensitized cells. This study affords a novel type of self-assembly to functionalize the nanostructured TiO2 electrode surface in supramolecular solar cells. © 2013 Elsevier Ltd. All rights reserved. Source


Cao J.,Northwest Normal University | Hu D.-C.,Northwest Normal University | Liu J.-C.,Northwest Normal University | Li R.-Z.,CAS Changchun Institute of Applied Chemistry | Jin N.-Z.,Gansu Computing Center
Organic Electronics: physics, materials, applications | Year: 2014

In this work, employing the metal-mediated assembling strategy for organizing acetohydrazide zinc porphyrin (ZnP) and different organic acid (Ai) ligands on the nanostructured TiO2 electrode surfaces have been prepared, wherein the ZnP and Ai units are bound by a series of differently bivalent metal ions (M, M = Mn2+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+ and Hg2+), resulting in a ZnP-M-Ai assembled approach. The photovoltaic performances of these assemblies-sensitized solar cells were performed under irradiance of 100 mW cm-2 AM 1.5G sunlight. A significantly improved conversion efficiency of ZnP-Mn-A5 and ZnP-Cd-A5 devices occurs, indicating well-ordered arrangements of ZnP molecules on the TiO2 electrode surfaces for ZnP-Mn-A5 and ZnP-Cd-A5, where A5 is a pyridine-monocarboxylic acid ligand bearing longer arm. The results were also verified by the HOMO-LUMO gaps, UV-vis and fluorescence spectra. © 2013 Elsevier B.V. All rights reserved. Source


Cao J.,Northwest Normal University | Liu J.-C.,Northwest Normal University | Chen L.-W.,Northwest Normal University | Li R.-Z.,CAS Changchun Institute of Applied Chemistry | Jin N.-Z.,Gansu Computing Center
Tetrahedron Letters | Year: 2013

Two new self-assemblies based on two zinc porphyrins substituted at the meso-positions with different donor units (denoted as ZnP1 and ZnP2) and isonicotinic acid (A) by metal-ligand axial coordination have been designed and immobilized on the double-layer nanostructured TiO2 film-coated highly transparent FTO conducting glass electrode in a photosynthesis device. These cells were also measured under irradiance of 100 mW cm-2 AM 1.5G sunlight. The results reveal that the performance of ZnP2-A outperforms that of ZnP1-A. The UV-vis absorption spectra, fluorescence spectra, molecular orbital (MO) patterns, and HOMO-LUMO energy gaps of these assemblies were also investigated to further demonstrate the photovoltaic behavior of these cells. © 2013 Elsevier Ltd. All rights reserved. Source


Cao J.,Northwest Normal University | Liu J.-C.,Northwest Normal University | Deng W.-T.,Northwest Normal University | Jin N.-Z.,Gansu Computing Center
CrystEngComm | Year: 2013

To probe the coordination approach of pyridazine and pyrazine ligands, five new complexes of [CuII 2L2Cl2] (1), [CuII(L-H)(NO3)(H2O)2](NO 3)(H2O) (2), {[CuII(L-H)(H2O)] (ClO4)2(H2O)}n (3), [Cu II 2L2(OH)](NO3)(H2O) 2 (4), [CuII 2L2(OH)](ClO 4) (5) based on Schiff base ligand (E)-3-chloro-6-[2-(pyrazin-2- ylmethylene)hydrazinyl]pyridazine (HL) bearing pyridazinyl and pyrazinyl groups have been synthesized and characterized by IR spectra, elemental analyses, the bond valence sum (BVS) analyses, powder X-ray diffraction (PXRD) analyses, X-ray single crystal diffraction and density function theory calculations. The structures of 1, 2 and 3 suggest that the second nitrogen donors of the pyrazinyl unit can link with other metal ions to construct a higher dimensional architecture by the reaction of HL with Cu(ClO4)2 [CuCl2 for 1, Cu(NO3)2 for 2 and Cu(ClO 4)2 for 3]. The structures of 4 and 5 indicate that additional donor units of the pyridazinyl chromophore can bind multiple metal ions to form a multi-metallic cluster, when the protons of the hydrazone backbones are abstracted in the presence of triethylamine to strengthen the coordination behavior of the second nitrogen atom. However, for 1, the protons of the hydrazone backbone are lost with or without triethylamine and the additional nitrogen atoms of the pyrazinyl and pyridazinyl groups are not found to connect to other metal ions, which can probably be assigned to the strong coupling effect of chlorine ions. Magnetic measurements display weak antiferromagnetic coupling between the copper(ii) ions in 1 and 5, and ferromagnetic coupling in 3. In addition, the antioxidant activities of HL and 1-5 were also studied. © 2013 The Royal Society of Chemistry. Source

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