A novel 1D tungstoarsenate with mixed organic ligands assembled by hexa-Cu sandwiched Keggin units and dinuclear copper-oxalate complexes

A novel transition metal substituted tungstoarsenate [Cu2(phen)2(μ-ox)]{[Cu(phen)(H2O)2][Cu4 (H2O)4Cu2(phen)2(AsW9O33)2]}·6H2O (ox = oxalate, phen = 1,10-phenanthroline) (1) has been synthesized by reaction of K14[As2W19O67(H2O)]·nH2O, CuCl2·2H2O, H2C2O4·2H2O and phen under hydrothermal conditions and characterized by elemental analyses, IR and UV spectra and X-ray single-crystal diffraction. 1 displays a 1D chain architecture constructed by alternating hexa-Cu sandwiched units {[Cu(phen)(H2O)2]2[Cu4(H2O)4Cu2(phen)2(AsW9O33)2]}2− and dinuclear copper(II)-oxalate complexes [Cu2(phen)2(μ-ox)]2+. The 3D supramolecular network can be established by intra- and inter-molecular π–π packing interactions. To the best of our knowledge, 1 represents the first 1D chain-like inorganic–organic hybrid tungstoarsenate with mixed organic ligands containing hexa-nuclear sandwiched units bridged by copper-oxalate complex linkers.

Graphical abstractThe first example of 1D chain-like inorganic–organic hybrid tungstoarsenate with mixed organic ligands containing hexa-nuclear sandwiched units bridged by copper-oxalate complex linkers has been prepared.Figure optionsDownload full-size imageDownload as PowerPoint slideResearch Highlights► A novel TMC-substituted tungstoarsenate displays 1D chain architecture. ► Hexa-Cu sandwich-type polyanions and di-Cu complexe cations alternating connected. ► The first 1D chain-like hybrid tungstoarsenate with mixed organic ligands. ► π–π interactions between the neighboring phen ligands leading to the 3D framework.