catena-Poly[sodium-μ₂-(N,N,N′,N′-tetra­methyl­ethane-1,2-diamine)-κ²N:N′-sodium-bis­[μ₂-bis­(trimethyl­sil­yl)aza­nido-κ²N:N]]

The title compound, [Na₂(C₆H₁₈NSi₂)₂(C₆H₁₆N₂)]_n, was found to consist of dimeric [Na(NSiMe₃)₂] units with crystallographically imposed centrosymmetry based upon four-membered NaNNaN rings. The dimers are bridged by N,N,N′,N′-tetra­methyl­ethylenediamine ligands, which act in an unusual extended non-chelating coordination mode. This gives a one-dimensional coordination polymer that extends parallel to the a-axis direction.

Diethyl 3,4-dimethyl­thieno[2,3-b]thio­phene-2,5-dicarboxyl­ate

In the title compound, C₁₄H₁₆O₄S₂, the thieno[2,3-b]thio­phene ring systems are planar [maximum deviation = 0.008 (2) Å]. The mol­ecular conformation is stabilized by intra­molecular C—H...O hydrogen bonds, while the crystal packing is stabilized by C—H...O, C—H...π and π–π stacking [centroid–centroid distance = 3.6605 (14) Å] inter­actions, which lead to supra­molecular layers in the ab plane.

4-Phenyl-1H-1,5-benzodiazepin-2(3H)-one

In the title compound, C₁₅H₁₂N₂O, the phenyl ring makes a dihedral angle of 32.45 (9)° with the benzene ring of the 1,5-benzodiazepin-2-one unit. The seven-membered ring adopts a boat conformation with the methyl­ene group as the prow and the fused benzene-ring C atoms as the stern. In the crystal, inversion dimers linked by pairs of N—H...O hydrogen bonds generate R₂²(8) loops. The dimers are further linked by C—H...O hydrogen bonds, so forming a column along the a-axis direction.

2,4,6-Trinitro­phenyl benzoate

In the title mol­ecule, C₁₃H₇N₃O₈, the phenyl and benzene rings are rotated from the mean plane of the central ester group by 18.41 (9) and 81.80 (5)°, respectively. The dihedral angle between the rings is 80.12 (14)°. In the crystal, mol­ecules are linked by weak C—H...O inter­actions, forming helical chains along [010].