Two new lanthanide-based coordination polymers, [Sm2(bzz)(ben)6(H2O)3]·0.5H2O (1) and [Eu(bbz)(ben)3] (2), were synthesized and characterized. The described products were formed from in situ-generated benzoate (ben) and N’-benzoylbenzohydrazide (bbz) ligands, which were the products of transformation of originally added benzhydrazide (bzz) under hydrothermal conditions. Compound 1 exhibits a one-dimensional (1D) double-chain structure built up from the connection of the central Sm3+ ions with a mixture of bzz and ben ligands. On the other hand, 2 features a 3D network with a 4-connected (66) dia topology constructed from dinuclear [Eu2(ben)6] secondary building units and bbz linkers. High-pressure CO2 sorption studies of activated 1 show that maximum uptake increases to exceptionally high values of 376.7 cm3 g−1 (42.5 wt%) under a pressure of 50 bar at 298 K with good recyclability. Meanwhile, 2 shows a typical red emission in the solid state at room temperature with the decay lifetime of 1.2 ms.
The title Schiff base compound, C25H20N2, crystallizes with two independent molecules (A and B) in the asymmetric unit. In both molecules, the imine group is approximately coplanar with the pyridine ring, with N—C—C—N torsion angles of 170.1 (3) and −172.0 (3) Å. In the crystal, A and B dimers are linked by pairs of C—H⋯π interactions and further C—H⋯π bonds link the dimers into a three-dimensional network.
Key indicators: single-crystal X-ray study; T = 298 K; mean (C-C) = 0.003 Å; disorder in main residue; R factor = 0.045; wR factor = 0.101; data-to-parameter ratio = 13.5.In the title compound, [Mn(NO 3 ) 2 (C 12 H 8 N 2 ) 2 ], the Mn II atom lies on a twofold rotation axis, and is six-coordinated in a distorted trans-N 4 O 2 octahedral environment by four N atoms from two 1,10-phenanthroline ligands and two O atoms from two nitrate anions. The nitrate anion is disordered about a twofold rotation axis with fixed occupancy factors of 0.5. In the crystal, molecules are linked by weak C-HÁ Á ÁO hydrogen bonds and -stacking interactions [centroid-centroid distance = 4.088 (5) Å ] into a three-dimensional supramolecular network.
Related literatureFor the isotypic Cd compound, see: Shi et al. (2004).
ExperimentalCrystal data [Mn(NO 3
Data collectionBruker SMART CCD area-detector diffractometer Absorption correction: multi-scan (SADABS; Sheldrick, 1996) T min = 0.819, T max = 1.000 13250 measured reflections 2748 independent reflections 2367 reflections with I > 2(I) R int = 0.028
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