Abstract
In the title complex, [NiCl2(C12H9N3)2]·H2O, a divalent nickel atom is coordinated by two 2-(pyridin-2-yl)-1H-benzimidazole ligands in a slightly distorted octa-hedral environment defined by four N donors of two N,N'-chelating ligands, along with two cis-oriented anionic chloride donors. The title complex crystallized with a water mol-ecule disordered over two positions. In the crystal, a combination of O-H⋯Cl, O-H.·O and N-H⋯Cl hydrogen bonds, together with C-H⋯O, C-H⋯Cl and C-H⋯π inter-actions, links the complex mol-ecules and the water mol-ecules to form a supra-molecular three-dimensional framework. The title complex is isostructural with the cobalt(II) dichloride complex reported previously [Das et al. (2011 ▸). Org. Biomol. Chem. 9, 7097-7107].
Highlights
In the paper by MacNeil et al (2020), the address of the second author, Aloice O
Complexes of precious metals (Rh, Ir, and Ru) have been the preferred catalysts for TH owing to their high activity and commercial availability (Raja et al, 2012; Wang et al, 2015; Li et al, 2015)
Cg1, Cg2, Cg3, Cg4 and Cg5 are the centroids of the C7–C12, N5/N6/C18/C19/ C24, N1/C1–C5, N4/C13–C17 and C19–C24 rings, respectively
Summary
Transition-metal-catalyzed transfer hydrogenation (TH) is an effective method of reducing ketones to the corresponding secondary alcohols (Zhu et al, 2014). The method is operationally simple, selective, and sources hydrogen from alcohols, avoiding high pressures of H2 gas (Zhu et al, 2014). Complexes of precious metals (Rh, Ir, and Ru) have been the preferred catalysts for TH owing to their high activity and commercial availability (Raja et al, 2012; Wang et al, 2015; Li et al, 2015). With growing concern surrounding the economic and environmental impact of using precious metals in chemistry, a renewed interest in Earth-abundant metal catalysis has prompted our research into TH catalysts featuring first-row transition metals, such as iron, cobalt, or nickel Cg1, Cg2, Cg3, Cg4 and Cg5 are the centroids of the C7–C12, N5/N6/C18/C19/ C24, N1/C1–C5, N4/C13–C17 and C19–C24 rings, respectively
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