Crystal structure and Hirshfeld surface analysis of 6-imino-8-(4-methyl-phen-yl)-1,3,4,6-tetra-hydro-2-pyrido[1,2-]pyrimidine-7,9-dicarbo-nitrile.

In the ten-membered 1,3,4,6-tetra-hydro-2-pyrido[1,2-]pyrimidine ring system of the title compound, CHN, the 1,2-di-hydro-pyridine ring is essentially planar (r.m.s.

First Iridium(IV) Chloride-Dimethyl Sulfoxide Complex [H(dmso)][IrCl(dmso-κO)]: Synthesis and Structure along with Novel Polymorph Modifications of [H(dmso)][-IrCl(dmso-κS)] and [H(dmso)][IrCl(dmso-κS)].

As evidenced by UV-Vis and EPR spectroscopies, the reaction of HIrCl·6HO or Na[IrCl]·HO with DMSO results in a slow reduction of Ir(IV) avoiding the formation of Ir(IV) dimethyl sulfoxide complexes in measurable quantities. More specifically, we successfully isolated and solved the crystal structure of a sodium hexachloridoiridate(III), Na[IrCl]·2HO, as a product of Na[IrCl]·HO reduction in an acetone solution. Furthermore, it was shown that [IrCl(MeCO)] species is gradually formed in an acetone solution of HIrCl·6HO upon storage.

Crystal structure and Hirshfeld surface analysis of 3-benzoyl-6-(1,3-dioxo-1-phenyl-butan-2-yl)-2-hy-droxy-2-methyl-4-phenyl-cyclo-hexane-1,1-dicarbo-nitrile.

The central cyclo-hexane ring of the title compound, CHNO, adopts a chair conformation, with puckering parameters = 0.618 (2) Å, θ = 176.72 (19)° and φ = 290 (3)°.

Crystal structure and Hirshfeld surface analysis of 2-(4-bromo-phen-yl)-4-methyl-6-oxo-1-phenyl-1,6-di-hydro-pyridine-3-carbo-nitrile.

In the title compound, CHBrNO, the pyridine ring is essentially planar [maximum deviation = 0.024 (4) Å for the N atom] and makes dihedral angles of 74.6 (2) and 65.

Crystal structure and Hirshfeld surface analysis of 2-amino-4-(4-meth-oxy-phen-yl)-6-oxo-1-phenyl-1,4,5,6-tetra-hydro-pyridine-3-carbo-nitrile.

The central tetra-hydro-pyridine ring of the title compound, CHNO, adopts a screw-boat conformation. In the crystal, strong C-H⋯O and N-H⋯N hydrogen bonds form dimers with (14) and (12) ring motifs, respectively, between consecutive mol-ecules along the -axis direction. Inter-molecular N-H⋯O and C-H⋯O hydrogen bonds connect these dimers, forming a three-dimensional network.