Crystal structure of bis(2,2′-bipyridine-N,N′)dibromomanganese(II), MnBr2(C10H8N2)2

Abstract

Source of materialToasolution of 2,2¢ -bipyridine (0.59 g, 3.78 mmol) in acetone (20 ml) was added asolution of MnBr 2 (0.40 g, 1.86 mmol) in H 2 O (10 ml), and stirred for 10 min at RT.The solvent was removedin vacuo, the residue washed with acetone and dried, giving ayellow powder (0.89 g). Crystals suitable for X-ray structure analysis were obtained via slow evaporation from awater solution. (7) Discussion

Photoinduced Generation of a Durable Thermal Proton Reduction Catalyst with in Situ Conversion of Mn(bpy)(CO)3Br to Mn(bpy)2Br2

“…No hydride signal was evident in the 0 to −70 ppm range. However, when TfOH, TsOH, or AcOH was added as an acid, the known complex Mn­(bpy) 2 Br 2 , could be obtained as X-ray quality crystals by evaporating the volatile components and taking the solids up in MeOH followed slow vapor diffusion of diethyl ether to give the crystalline complex at the top of the vial in high yield (>90% based on bpy, > 45% based on Mn). The structure was confirmed by crystallography at 90 K (Figure ).…”

catena-Poly[[(2,2′-bipyridine-κ2 N,N′)manganese(II)]-di-μ-bromido]

“…With reference to the title complex, [MnBr 2 (bipy)] n (bipy = 2,2 0 -bipyridine), the crystal structures of related Mn II complexes, namely [MnCl 2 (bipy)] n (Lubben et al, 1995) and [MnBr 2 (bipy) 2 ] (Hwang & Ha, 2007) have been determined previously.…”

Controlling Secondary Alkyl Radicals: Ligand Effects in Chromium-Catalyzed C–P Bond Formation

“…Comparable yields were obtained with catalyst 3 when the reaction was protected from ambient light or when P 2 Ph 4 and Ph 2 PH were used as precursors (entries 2 and 3). In all cases, bipyridine was added at the completion of the reaction in order to displace Ph 2 PCy from the paramagnetic MnBr 2 byproduct. − The catalytic activity of the symmetric CpCr[(XylNCMe) 2 CH] Cr(II) complex 6 was assessed under the same reaction conditions. Although we have been unable to characterize the corresponding Cr(III) cyclohexyl complex by X-ray crystallography, due to its instability, the catalytic use of the bulkier 2,6-Me 2 C 6 H 3 disubstituted ligand led to an unexpected increase in the yields of Ph 2 PCy from each phosphorus substrate (entries 4–6).…”