RESUMEN
In the title compound, C17H12N2O, the quinoxaline moiety shows deviations of 0.0288â (7) to -0.0370â (7)â Å from the mean plane (r.m.s. deviation of fitted atoms = 0.0223â Å). In the crystal, corrugated layers two mol-ecules thick are formed by C-Hâ¯N hydrogen bonds and π-stacking inter-actions.
RESUMEN
In the title compound, C31H24N4O2, the quinoxaline units are distinctly non-planar and twisted end-to-end. In the crystal, C-Hâ¯O and C-Hâ¯N hydrogen bonds link the mol-ecules into chains extending along the a-axis direction. The chains are linked through π-stacking inter-actions between inversion-related quinoxaline moieties.
RESUMEN
In the title mol-ecule, C17H16N2OS, the di-hydro-imidazolone ring is slightly puckered and the methyl-sulfanyl group is nearly coplanar with it. In the crystal, two sets of C-Hâ¯O hydrogen bonds form corrugated layers of mol-ecules parallel to the ac plane. The layers pack with normal van der Waals contacts between them.
RESUMEN
The title compound, C20H21F3N2O4, features a main twelve-membered difuryl ring with which the furan rings make dihedral angles of 76.14â (5) and 33.81â (5)°. The dihedral angle between the furan rings is 42.55â (7)°. The six-membered nitro-gen heterocycle has a twist-boat conformation. In the crystal, pairs of mol-ecules are connected by inter-molecular C-Hâ¯O inter-actions, generating an R 2 2(14) ring motif. These pairs of mol-ecules form zigzag chains along the a-axis direction by means of C-Hâ¯F inter-actions. Furthermore, C-Hâ¯π and C-Fâ¯π inter-actions link the mol-ecules into chains along the b-axis direction, forming sheets parallel to the (001) plane. These sheets are also connected by van der Waals inter-actions.
RESUMEN
Treatment of an S-bridged penta-nuclear AgI3CoIII2 complex, [Ag3{Co(L)}2]3+ [L3- = N(CH2NHCH2CH2S-)3], in which two tris-(thiol-ate)-type mononuclear CoIII units ([Co(L)]) are bridged by three AgI ions through S atoms, with iodo-methane (CH3I) gave a new CoIII mononuclear complex, [Co(LMe2)]2+ [LMe2- = N(CH2NHCH2CH2S-)(CH2NHCH2CH2SCH3)2], systematic name: {2-[(bis{[2-(methylsulfanyl)ethyl]aminomethyl}aminomethyl)amino]ethanethiolato}cobalt(III) bis(hexafluoridophosphate). This cationic complex was crystallized with PF6- anions to form the title compound, [Co(LMe2)](PF6)2. In the [Co(LMe2)]2+ cation, two of three thiol-ate groups in [Co(L)] are methyl-ated while one thiol-ate group remains unreacted. Although a total of eight stereoisomers are possible for [Co(LMe2)]2+, only a pair of enanti-omers {Λ RR - and Δ SS -[Co(LMe2)]2+} are selectively formed. In the crystal, the complex cations and the PF-6- anions are connected through weak N-Hâ¯F, C-Hâ¯F and C-Hâ¯S hydrogen bonds into a three-dimensional structure. Two F atoms in one PF6 anion are disordered over two sets of sites with refined occupancies of 0.61â (4) and 0.39â (4) and two F atoms in the other PF6- anion are disordered over two sets of sites with occupancies of 0.5.
RESUMEN
The asymmetric unit of the title compound, C48H54O5S4·N(C2H5)4 (+)·Cl(-), contains two tetra-tert-butyl-[(benzo-yl)meth-oxy]-trihy-droxy-tetra-thia-calix[4]arene mol-ecules, two tetra-ethyl-ammonium cations and two chloride anions. The two calixarene molecules in the asymmetric unit each display a cone conformation. There are no significant differences between the two independent molecules. The guest species do not sit within the calixarene 'buckets'. In the crystal, extensive O-Hâ¯O, O-Hâ¯S and O-Hâ¯Cl hydrogen bonds and weak C-Hâ¯O, C-Hâ¯S and C-Hâ¯Cl inter-actions link the thia-calixarene mol-ecules, tetra-ethyl-ammonium cations and chloride anions, forming a three-dimensional network encompassing channels running parallel to the a-axis direction. The structure contains a solvent-accessible void of 76â (3)â Å(3), but no solvent mol-ecule could reasonably be located. The crystal studied was an inversion twin with a 0.57â (8):0.43â (8) domain ratio.