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

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.

Bis{2-[(Tri­phenyl­meth­yl)amino]­phen­yl} diselenide aceto­nitrile monosolvate

The mol­ecular structure of the title compound, C₅₀H₄₀N₂Se₂·C₂H₃N, shows a syn conformation of the benzene rings bound to the Se atoms, with an Se—Se bond length of 2.3529 (6) Å and a C—Se—Se—C torsion angle of 93.53 (14)°. The two Se-bonded aromatic ring planes make a dihedral angle of 18.42 (16)°. Intra­molecular N—H...Se hydrogen bonds are noted. Inter­molecular C—H...Se inter­actions give rise to supra­molecular chains extended along [100]. One severely disordered aceto­nitrile solvent mol­ecule per asymmetric unit was treated with SQUEEZE in PLATON [Spek (2009). Acta Cryst. D65, 148–155]; the crystal data take the presence of this mol­ecule into account.

Crystal structure of 2,2′-({[2-(trityl­sulfan­yl)benz­yl]azane­diyl}bis­(ethane-2,1-di­yl))bis­(isoindoline-1,3-dione)

In the structure of the title compound, C₄₆H₃₇N₃O₄S, the planes of the two isoindoline units make a dihedral angle of 77.86 (3)°. The dihedral angles between the benzyl plane and the isoindoline units are 79.56 (4) and 3.74 (9)°. The geometry at the S atom shows a short [1.7748 (17) Å] S—C_benz­yl and a long [1.8820 (15) Å] S—C_trit­yl bond and the C—S—C angle is 108.40 (7)°. N—C bond lengths around the azane N atom are in the range 1.454 (2)–1.463 (2) Å. he crystal packing exhibts two rather `non-classical' C—H...O hydrogen bonds that result in stacking of the molecules along the a as well as the b axis and give rise to columnar sub-structures.