Syntheses, structures, spectroscopic and electrochemical properties of two 1D organic–inorganic CuII–LnIII heterometallic germanotungstates

• Copper–lanthanide heterometallic germanotungstate.
• IR spectra of copper–lanthanide heterometallic germanotungstates.
• Photoluminescence spectra of germanotungstates.
• The electrocatalytic activity for nitrite reduction.

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.

Two 1-D copper–lanthanide heterometallic germanotungstate hybrids have been synthesized and IR spectra, the photoluminescence spectra and the electrocatalytic activity for nitrite reduction of 1 have been studied.Figure optionsDownload as PowerPoint slide