Tetranuclear Ln(III) complexes with 2-sulfobenzoate and their three-dimensional supramolecular frameworks consolidated through hydrogen-bonding and intermolecular O···π interactions

Abstract Two isostructural tetranuclear Ln(III) complexes {[Ln 2 (2-SB) 3 (phen) 3 (H 2 O) 2 ]·4.5H 2 O} 2 (Ln = Er ( 1 ), Y ( 2 )) with 2-sulfobenzoate (2-SB) as bridge and 1,10-phenanthroline (phen) as terminal are synthesized and characterized through single-crystal X-ray diffraction, IR and near-infrared luminescence spectroscopy. The tetranuclear structural motifs are further assembled into three-dimensional supramolecular architectures through hydrogen-bonding and O(sulfonate) ⋯ π(phen) interactions. A hexamer (H 2 O) 6 cluster with novel configuration is revealed in the conglomeration of the tetranuclear motifs.