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Recently, we described the chemoselective reduction of quinolines and related N-heterocycles by molecular hydrogen, using a simple Mn complex [Mn(CO)5Br] (Papa et al., 2020). During the mechanistic studies of this catalytic reaction, several manganese compounds starting from [Mn(CO)5Br] and different N-heteroarenes were prepared and characterized by spectroscopic methods. In this context, the title compound was synthesized and structurally determined by single-crystal X-ray diffraction. The molecular structure consists of a manganese(III) atom coordinated by one bromido and two bidentate benzo[h]quinolin-10-olato ligands (Fig. 1). The coordination environment around the Mn atom is best described as distorted square-pyramidal with the Br ligand in the apical position ( = 0.35, with = 0 for an ideal square pyramid and = 1 for an ideal trigonal bypramid; Addison et al., 1984). The deviation from planarity in the strained benzo[h]quinolin-10-olato ligands can be derived from the torsion angles N1— C13—C12—C11 of 10.0 (3) and N2—C26—C25—C24 of 11.0 (3) . In the crystal structure, – stacking interactions along the crystallographic b axis are observed between N1/C1–C4/C13 and between the C7–C12 rings, respectively (Fig. 2), with centroid-to-centroid distances Cg(N1/C1–C4/C13) Cg(N1/C1–C4/C13) = 3.6804 (14) Å [symmetry code: (i) 1 x, 2 y, 1 z], ring slippage = 1.42 Å, and Cg(C7– C12) Cg(C7–C12) = 3.6194 (16) Å [symmetry code: (ii) = 2 x, 1 y, 1 z], ring slippage 1.33 Å. Neighbouring molecules are also linked along the a axis by – stacking Received 14 November 2020 Accepted 30 November 2020

Bis(benzo[h]quinolin-10-olato-κ2 N,O)bromidomanganese(III)

Bis(benzo[h]quinolin-10-olato-κ² N,O)bromidomanganese(III)