Crystal structure of dichloridobis(1,3-diisopropyl-4,5-dimethyl-2H-imidazole-2-thione-κS)zinc(II)

Abstract

The mol­ecular structure of the title compound, [ZnCl2(C11H20N2S)2], shows tetra­hedral Zn coordination from two Cl ligands and two thione groups. The Zn—Cl bond lengths differ sligthly at 2.2310 (10) and 2.2396 (11) Å while the Zn—S bond lengths are equal at 2.3663 (9) and 2.3701 (10) Å. The Cl—Zn—Cl angle is 116.04 (4) and S—Zn—S is 101.98 (3)°. All other angles at the central Zn atom range from 108.108 (3) to 110.21 (4)°. The C—S—Zn angles are 100.75 (10) and 103.68 (11)°, the difference most probably resulting from packing effects, as both the C—S and both the S—Zn bonds are equal in each case. The two imidazole ring planes make a dihedral angle of 67.9 (1)°. The CH3 groups of one isopropyl moiety are disordered over two sets of sites with occupation factors of 0.567 (15) and 0.433 (15). It may be noteworthy that the isomolecular Cu complex shows a different crystal packing (group–subgroup relation) with the Cu atom lying on a twofold rotation axis. In the crystal, the shortest non-bonding contact is a C—H⋯Cl inter­action. This leads to the formation of centrosymmetric dimers that are stacked along the c-axis.

N-Heterocyclic Carbene Adducts of Main Group Elements and Their Use as Ligands in Transition Metal Chemistry

“…Interestingly, the arylthiolate complex [(Ter)­SCu­{S­( Me I i Pr)}] ( 591 , Ter = 2,6-bis­(2,4,6-triisopropylphenyl)­phenyl) was prepared by treatment of the corresponding carbene complexes with S 8 . Furthermore, structural data of [{( Me I i Pr)­S} 2 CuCl 2 ], [{( Me I i Pr)­S} 2 CuCl], and [{( Me I i Pr)­S} 2 ZnCl 2 ] were reported. ( Me I i Pr)S made another appearance in 2017, when Chaplin and co-workers reported some unusual calix[4]­arene-based thione ligands, which were used for rhodium­(I) and iridium­(I) complexation.…”