The exploration of co-complexation reactions between alkai-metal reagents and ZnEt with bidentate aminopyrrolyl ligands afforded a series of alkali-metal (Li, Na, K) alkyl zincates with a variety of intriguing structures, ranging from molecular complexes to more coordination polymers. All aforementioned complexes have been characterized by X-ray crystallography, NMR, IR and UV-vis spectroscopy.
Five heterobimetallic magnesiates bearing bidentate pyrrolyl ligand have been synthesized and their structural features were provided. As catalyst for cross-coupling Tishchenko reaction, they exhibited higher catalytic activities and chemoselectivity.
The title compound, C 16 H 18 N 4 O 2 Se 2 , is centrosymmetric. The dihedral angle between the pyridine ring and the amide side chain is 56.20 (16) . In the crystal, a weak C-HÁ Á ÁO interaction links the molecules into [010] chains.
Structure descriptionMany investigations have demonstrated that organoselenium compounds are less toxic than those of inorganic selenium compounds (Jalbout et al. 2008). However, to gain further insight into the role of organoselenium compounds, detailed studies are still needed. As part of our research in this area, we report herein the synthesis and crystal structure of the title compound (Fig. 1).The complete molecule is generated by a crystallographic centre of symmetry at the mid-point of the Se-Se bond. This implies, of course, that the C-Se-Se-C torsion angle is 180, which minimizes repulsion of the Se lone pairs, and the dihedral angle between the pyridine rings is 0 . The pyridine ring is substituted at the 2-position [C1-Se = 1.923 (3) , respectively, indicating that the Se-Se bond lies close to the plane of each pyridine ring. In the crystal, weak C-HÁ Á ÁO bonds (Table 1)
Synthesis and crystallizationThe title compound was prepared follows a modified literature procedure (Feng et al., 2010). To a vigorously stirred solution of selenium powder (1.00 g, 12.6 mmol) and absolute ethanol (30 ml), sodium borohydride (0.35 g, 9.3 mmol) was added at 0 C. The mixture was warmed to room temperature and stirred for 2 h. 2-Chloro-N,N-dimethyl-
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