Crystal and molecular structure of dichlorotris(2-methylimidazole)manganese(II); a high-spin pentacoordinate complex of manganese

Abstract

Dichlorotris-(2-methylimidazole)manganese(II), MnCl2(2-meim)a, is monoclinic with a= 8.189 (1), b= 14.763 (1), c= 14"419 A, fl= 108.69 (1) °, space group P21/c and Z=4. The structure has been determined from diffractometer data, and least-squares refinement with 2397 independent reflexions has reached R = 0.046. A monomeric pentacoordinate structure is found, in which the coordination, though severely distorted towards square pyramidal, is essentially trigonal bipyramidal. A C1 atom and a 2-meim ligand occupy the axial positions with Mn-C1 and Mn-N distances of 2-525 and 2"249 A respectively. For the equatorial groups the respective bonds are somewhat shorter -a C1 at 2.392 A and two 2-meim ligands with a mean Mn-N of 2.195 /~. The molecule has approximate m (C~) symmetry.

Structure of trans-dichlorobis(1-methylimidazole)palladium(II), [Pd(C4H6N2)2Cl2]

“…The imidazole ring is planar, with no atom deviating from the least-squares plane through the five atoms by more than 0.006 (6) A; the Pd and methyl C atoms lie only 0.15 (1) and 0.08 (1) A out of this plane, respectively. The bond lengths and angles in the 1-methylimidazole ligand are similar to those already reported (Graves, Hodgson, van Kralingen & Reedijk, 1978) and also to those in a variety of metal complexes of imidazole and its derivatives (Carmichael, Chan, Cordes, Fair & Johnson, 1972;Phillips, Shreeve & Skapski, 1976;Santoro, Mighell, Zocchi & Reimann, 1969).…”

Diaquadichloridobis(1H-imidazole)manganese(II) at 100 K

“…The Mn1-Cl1 distance [2.5747 (3) Å ] is close to the value in [MnCl 2 (2-MeIm) 3 ] (2.525 Å ), in which one Cl atom is in an axial position (Phillips et al, 1976). However, this Mn1-Cl1 length is different from that in [MnCl 2 (2-MeIm) 3 ], which has the Cl atom in an equatorial position (2.392 Å ; Phillips et al, 1976). The coordinated imidazole rings of the title compound are essentially planar, with r.m.s.…”

“…average value in [Mn(H 2 O) 6 ] 2+ (2.177 Å ; Carrell & Glusker, 1973). The Mn1-Cl1 distance [2.5747 (3) Å ] is close to the value in [MnCl 2 (2-MeIm) 3 ] (2.525 Å ), in which one Cl atom is in an axial position (Phillips et al, 1976). However, this Mn1-Cl1 length is different from that in [MnCl 2 (2-MeIm) 3 ], which has the Cl atom in an equatorial position (2.392 Å ; Phillips et al, 1976).…”

Effects of Carbon Content and Current Density on the Li+ Storage Performance for MnO@C Nanocomposite Derived from Mn-Based Complexes

“…For this complex, a Cl atom and a 2-meim ligand occupied the axial position, with Mn–Cl and Mn–N distance being determined to be 2.525 and 2.249 Å, respectively. For the equatorial groups, the respective bonds were somewhat shorter—a Cl at 2.392 Å and two 2-meim ligands with a mean Mn–N of 2.195 Å [ 16 ]. In the next step, the above-mentioned brown solution hydrolyzed upon the addition of water and resulted in the formation of Mn 3 O 4 nanoparticles.…”

“…The preparation of [MnCl 2 (2-meim) 3 ] was carried out according to the previous report with some modifications [ 16 ]. The schematic illustration of the synthetic process is shown in Figure 1 .…”