ZERO/ONE-DIMENSIONAL COORDINATION COMPLEXES BASED ON CARBOXYLATE AND MULTINITROGEN DONOR LIGANDS: STRUCTURAL DIVERSITY A
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ZERO/ONE-DIMENSIONAL COORDINATION COMPLEXES BASED ON CARBOXYLATE AND MULTINITROGEN DONOR LIGANDS: STRUCTURAL DIVERSITY AND PHOTOCATALYTIC DEGRADATION OF ORGANIC DYE J. Song1, J. Li1, and J.-T. Li1*
Two new coordination complexes with the chemical formula [Co(bpda)(bimb)(H2O)](H2O)(CH2Cl2) (1) and {[Co(bdc)(bimb)](H2O)2(DMF)}n (2) are successfully prepared by the reaction of Co(NO3)2⋅6H2O and the 6,6′-bis(1H-benzo[d]imidazol-2-yl)-2,2′-bipyridine (bimb) ligand with different carboxylate ligands (4,4′-([3,4′-bipyridine]-2′,6′-diyl)dibenzoic acid (H2bpda) for 1 and terephthalic acid (H2bdc) for 2. The two as-prepared complexes are further analyzed by powder X-ray diffraction. In addition, the photocatalytic activity of complex 2 towards the degradation of methyl violet (MV) in polluted water is explored. DOI: 10.1134/S0022476620080077 Keywords: coordination complex, mixed-ligand, X-ray, photocatalytic activity.
INTRODUCTION The structural prosperity of coordination compounds would be unimaginable without multifunctional and polydentate ligands [1-4]. Different types of transition metal nodes and N/O-donor ligands are combined to produce a higher dimensional structure having potential properties, such as catalysis, gas adsorption, magnetism, ion exchange, electric conductance, proton conductance photo luminescence, etc. [5-7]. Thus, the smart choice of organic linkers as well as metal ions, counteranions, reaction temperatures, pH of the medium, solvents, etc. can also play a vital role to create the overall structural and functional diversities in coordination complexes [8-10]. In order to tune the structure-property relationship, among the various factors, organic ligands play crucial roles in the formation of coordination complexes. In this regard, the structural features of organic ligands, such as shape, functionality, flexibility, symmetry, and length can directly affect the structures of coordination polymers. Apart from various organic ligands, N-donor ligands along with O-donor ligands have aroused great interest due to their diversities in coordination modes and conformations. It has also been established that coordination polymers with conjugated organic ligands are promising candidates for photocatalytic applications due to their luminescent properties [11-14]. As an effort to create robust mixed-ligand coordination complexes with conjugated organic ligands for photocatalytic dye degradation, we plan to investigate the structure-directing roles of bicarboxylate ligands with different donor arrangements in the formation of divalent coordination polymers by combining neutral auxiliary multinitrogen donor ligands. Herein, we report the synthesis and structures of two new coordination complexes with the chemical formula
1
The Key Laboratory for Surface Engineering and Remanufacturing in Shaanxi Province, School of Chemical Engineering, Xi′an University, Xi′an, P.R. China; *[email protected]. Original article submitted December 12, 2019; revised December 25, 2019; accepted December 26, 2019. 0022-4766/20/
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