title: Syntheses, structures, spectroscopic and electrochemical properties of two 1D organic-inorganic CuII-LnIII heterometallic germanotungstates.
abstract: Two organic-inorganic hybrid copper-lanthanide heterometallic germanotungstates KNa2H7[enH2]3[Cu(en)2(H2O)]2[Cu(en)2]2{Cu(en)2[Eu(α-GeW11O39)2]2}·13H2O (1) and Na2H4[Cu(en)2(H2O)]2[Cu(en)2]6[Cu(en)2]{Cu(en)2[La(α-GeW11O39)2]2}·12H2O (2) have been hydrothermally synthesized by reaction of K8Na2[A-α-GeW9O34]·25H2O with CuCl2·2H2O and EuCl3/LaCl3 in the presence of en (en=ethylenediamine) and structurally characterized by elemental analyses, IR spectra and single-crystal X-ray diffraction. 1 exhibits the 1D chain motif built by tetrameric {[Cu(en)2(H2O)]2[Cu(en)2]2{Cu(en)2[Eu(α-GeW11O39)2]2}}(16-) moieties through square antiprismatic K(+) cations while 2 displays the 1D architecture made by tetrameric [[Cu(en)2]6[Cu(en)2]{Cu(en)2[La(α-GeW11O39)2]2}](10-) units via octahedral [Cu(en)2](2+) cations. Furthermore, the solid-state electrochemical and electrocatalytic properties of 1 have been investigated and 1 indicates the good electrocatalytic activity for nitrite reduction. In addition, the photoluminescence property of 1 has been investigated.
authors.affiliation: Institute of Molecular and Crystal Engineering, Henan Key Laboratory of Polyoxometalate Chemistry, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, Henan 475004, PR China.
authors.forename: Jingli
authors.initials: J
authors.lastname: Zhang
authors.forename: Jie
authors.initials: J
authors.lastname: Li
authors.forename: Lijie
authors.initials: L
authors.lastname: Li
authors.forename: Haozhe
authors.initials: H
authors.lastname: Zhao
authors.forename: Pengtao
authors.initials: P
authors.lastname: Ma
authors.forename: Junwei
authors.initials: J
authors.lastname: Zhao
authors.forename: Lijuan
authors.initials: L
authors.lastname: Chen
mesh_terms: D002384:Catalysis; D003300:Copper / Q000737:chemistry*; D055664:Electrochemical Techniques; D005857:Germanium / Q000737:chemistry*; D028581:Lanthanoid Series Elements / Q000138:chemical synthesis / Q000737:chemistry*; D049449:Luminescence; D008958:Models, Molecular; D009573:Nitrites / Q000737:chemistry; D010084:Oxidation-Reduction; D017973:Tungsten Compounds / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: D028581:Lanthanoid Series Elements; D009573:Nitrites; D017973:Tungsten Compounds; D005857:Germanium; D003300:Copper; C045951:tungstate
keywords: Copper–lanthanide heterometal; Electrocatalytic property; Germanotungstate; IR spectra; Photoluminescence; Polyoxometalate