Bis(adamantan-1-aminium) carbonate

In the title compound, 2C₁₀H₁₈N⁺·CO₃²⁻, the adamantan-1-aminium cation forms three N—H...O hydrogen bonds to three carbonate ions, resulting in a layer parallel to (001) with the adamantane groups located on its surface so that adjacent layers form only C—H...H—C contacts. The carbonate anions occupy special positions of 32 symmetry, whereas the adamantan-1-aminium cations occupy special positions of 3 symmetry.

N-[(2Z,4Z)-4-Benzyl­idene-6-chloro-1,4-dihydro­pyrido[2,3-d][1,3]thia­zin-2-yl­idene]benzamide

In the crystal structure of the title compound, C₂₁H₁₄ClN₃OS, mol­ecules assemble into inversion dimers via pairs of N—H...N hydrogen bonds involving the N—H hydrogen of the thia­zine ring and the N atom of the pyridine ring. There is a close intra­molecular contact [2.570 (2) Å] between the carbonyl O atom of the benzamide and the S atom of the puckered thia­zine ring. The title compound can exist in two tautomeric forms, viz. amino or imino. The observed structure is compatible with the imino form on the basis of observed residual electron density and the two C—N bond lengths of 1.308 (2) and 1.353 (2) Å.

N-(2,6-Diisopropyl­phen­yl)thio­amide

In the crystal structure of the title compound, C₁₃H₁₉NS {systematic name: N-[2,6-bis­(propan-2-yl)phen­yl]carbothio­amide}, mol­ecules assemble via N—H...S=C hydrogen bonds into helical chains along the b axis. The thio­amide moiety, with a syn disposition of the N- and C-bound H atoms, is twisted out of the plane of the benzene ring to which it is connected, forming a dihedral angle angle of 77.60 (14)°.