Dichloridobis(pyridine-2-seleno­lato-κ²N,Se)tin(IV)

The title compound, [SnCl₂(C₅H₄NSe)₂], is the product of a reaction of 2,2′-dipyridyl diselenide with tin tetra­chloride. The mol­ecule is located about a twofold rotation axis. The coordination environment of the Sn^IV atom is a distorted octa­hedron, with two bidentate 2-pyridine­seleno­late ligands inclined to each other at an angle of 83.96 (7)°. The two Sn—Cl and two Sn—N bonds are in cis configurations, while the two Sn—Se bonds of 2.5917 (3) Å are in a trans configuration, with an Se—Sn—Se angle of 157.988 (15)°. In the crystal, π–π inter­actions between the pyridine rings [centroid-to-centroid distance of 3.758 (3) Å] and weak inter­molecular C—H...Cl hydrogen bonds link the mol­ecules into chains along the c axis.

(1R*,21S*,22R*,24S*)-Methyl ethyl 2-[23-hy­droxy-22,24-diphenyl-8,11,14-trioxa-25-aza­tetra­cyclo­[19.3.1.0^2,7.0^15,20]penta­cosa-2,4,6,15(20),16,18-hexaen-25-yl]but-2-enedioate

The title compound, C₄₀H₄₁NO₈, is a product of the reduction of the cyclic carbonyl group of the γ-piperidone subunit of the aza-14-crown-4 ether with subsequent re-esterification of its dimethyl butenoate substituent into a monoethyl monomethyl group. The aza­crown macrocycle exhibits a bowl conformation with a dihedral angle of 70.82 (5)° between the benzene rings fused to it. The piperidine ring adopts a chair conformation and the methyl ethyl ethyl­enedi­carboxyl­ate fragment has a cis conformation, with a dihedral angle of 66.51 (7)° between the two carboxyl­ate groups. The ethyl group is disordered over two sites with occupancies of 0.70 (1):0.30 (1). In the crystal, mol­ecules form inversion dimers, via pairs of O—H...O hydrogen bonds, that stack along the a axis.