Luminescent coordination polymers for the VIS and NIR range constituting LnCl and 1,2-bis(4-pyridyl)ethane

A series of 14 lanthanide containing coordination polymers LnCl 3 with 1,2-bis(4-pyridyl)ethane (bpe) was synthesized from either thiazole or pyridine. Depending on the ligand content, a structural diversity from 3D-frameworks 3 [LnCl 3 (bpe) 2 ]thz, Ln = CeLu, to 1D-strands 1 [La 2 Cl 6 (bpe) 2 (thz) 6 ] and 1 [LnCl 3 (bpe)(py) 2 ](bpe/py), Ln = Gd, Er, was obtained and characterized by X-ray single crystal diffraction, powder diffraction, differential thermal analysis and thermogravimetry (DTA/TG), IR-spectroscopy and photoluminescence spectroscopy. The compounds exhibit a variety of luminescence properties and different phenomena. This includes ligand centred fluorescence, metal-centred 5d4f/4f4f emission in the visible and the NIR range, antenna effects via Dexter and Frster energy transfer mechanisms, excitation dependent emission with a correlating shift of the chromaticity coordinates and inner filter effects by combined re-absorption/emission. Variable luminescence of lanthanide coordination polymers with bis-pyridylethane and thiazole.