Solvent-dependent luminescent Cu(I) framework based on 5-(4-pyridyl)tetrazole

A new Cu(Ι) coordination compound, Cu4(L)4·2EtOH (1), has been obtained from the solvothermal reaction of CuBr, HL (L=5-(4-pyridyl) tetrazole), EtOH and NH3·H2O. The structure determination reveals that 1 has a 2D network, where each Cu(I) atom adopts a trigonal coordination mode. The 2D networks stacked in an ABAB sequence through the π–π interaction to form a 3D supramolecular framework, giving a 1D channel along the b-axis. The TGA and powder XRD measurements reveal that the framework is stable after removal of the guest molecules. Gas (N2) adsorption measurement was carried out for the framework. Framework 1 shows II sorption profile with N2, which indicates that N2 molecules cannot diffuse into the micropore and only surface adsorption occurs. The photoluminescent research shows that compound 1 displays an interesting solvent-dependent luminescence.