Poly[3-methyl­pyridinium [(μ₂-di­hydrogen phosphito)bis­(μ₃-hydrogen phosphito)dizinc]]

The title compound features bifurcated template-to-framework N—H⋯(O,O) hydrogen bonds.

Bis[2,3-bis­(thio­phen-2-yl)pyrido[3,4-b]pyrazine]­silver(I) perchlorate methanol disolvate

The structure of bis­[2,3-bis­(thio­phen-2-yl)pyrido[3,4-b]pyrazine]­silver(I) perchlorate methanol disolvate is monoclinic. The Ag atom coordinates pyrido N atoms and is two-coordinate; however, the Ag atom has nearby O atoms that can be assumed to be weakly bonding – one from the perchlorate anion and one from the methanol solvate. One of the thienyl groups of a 2,3-bis­(thio­phen-2-yl)pyrido[3,4-b]pyrazine is flipped disordered and was refined to occupancies of 68.4 (6) and 31.6 (6)%.

mer-Bis(quinoline-2-carboxaldehyde 4-ethyl­thio­semicarbazonato)nickel(II) methanol 0.33-solvate 0.67-hydrate

The title complex exhibits a distorted octa­hedral geometry about the metal centre, which coordinates two tridentate ligands that are perpendicular to each other.

(S_C,R_S)-Bromido­(N-{4-methyl-1-[(4-methyl­phenyl)sul­fan­yl]­pentan-2-yl}-N′-(pyridin-2-yl)imidazol-2-yl­idene)palladium(II) bromide

The mol­ecule of the title NC_NHCS pincer N-heterocyclic carbene palladium(II) complex, [PdBr(C₂₁H₂₅N₃S)]Br, exhibits a slightly distorted square-planar coordination at the palladium(II) atom, with the five-membered chelate ring nearly planar. The six-membered chelate ring adopts an envelope conformation. Upon chelation, the sulfur atom becomes a stereogenic centre with an R_S configuration induced by the chiral carbon of the precursor imidazolium salt.

Ethidium benzoate methanol monosolvate

The crystal structure of a new ethidium salt has been determined. Two ethidium cations self-associate to form a dimer through π–π inter­actions.

13-Nitro­benzo[a][1,4]benzo­thia­zino[3,2-c]phenoxazine

The title compound crystallizes in the non-centrosymmetric ortho­rhom­bic space group Fdd2, with 16 mol­ecules in the unit cell. In the crystal, aromatic π–π stacking distance and short C—H⋯O contacts are observed.

4-(1H-2,3-Di­hydro­naphtho­[1,8-de][1,3,2]di­aza­borinin-2-yl)-1-ethylpyridin-1-ium iodide

The title compound is a di­aza­borinane featuring substitution at the 1, 2, and 3 positions of the nitro­gen–boron six-membered heterocycle. In the crystal, mol­ecules are stacked in a head-to-tail manner. The iodide ion makes close contacts with three organic mol­ecules and supports the alternating stack.

4-(1H-2,3-Di­hydro­naphtho­[1,8-de][1,3,2]di­aza­borinin-2-yl)-1-ethylpyridin-1-ium iodide monohydrate

The cation of the title hydrated salt is a di­aza­borinane featuring substitution at 1, 2, and 3 positions in the nitro­gen–boron six-membered heterocycle. In the crystal, the cations stack along [100] in an alternating head-to-tail manner, while the iodide ion and water mol­ecule form one-dimensional hydrogen-bonded chains beside the cation stack. The cation stacks and I⁻–water chains are crosslinked by N—H⋯I and N—H⋯O hydrogen bonds.

Redetermination of germacrone type II based on single-crystal X-ray data

The crystal structure model of germacrone type II determined from single-crystal X-ray data is compared with that of a previous synchrotron X-ray powder study

(2E,2′E)-1,1′-([1,1′-Biphen­yl]-4,4′-di­yl)bis­[3-(di­meth­ylamino)­prop-2-en-1-one]

The π-conjugated planar title mol­ecules are assembled through C—H⋯π inter­actions between neighboring mol­ecules, resulting in stacking along the c-axis.

Benzo[a][1,4]benzo­thia­zino[3,2-c]pheno­thia­zine

The title compound crystallizes in space group P2₁/c with four mol­ecules in the asymmetric unit.