Hydrate formation at extreme conditions

The article of Yamashita et al. [Acta Cryst. (2022), C78, 749–754] on water intercalation into the B1 structure of KCl under high pressure illustrates the ability of in situ crystal growth to by-pass kinetic barriers between phases, demonstrating the importance of this approach in phase discovery.

A three-step pathway from (2-amino­phenyl)chal­cones to novel styryl­quinoline–chalcone hybrids: synthesis and spectroscopic and structural characterization of three examples

Three new styryl­quinoline–chalcone hybrids are been syntheized using a three-step reaction sequence. In two of them, a combination of hydro­gen bonds and π–π stacking inter­actions generates three-dimensional assemblies, but in the third, only a single weak π–π stacking inter­action is present, linking the mol­ecules into chains.

Structure and charge analysis of a cyclic alu­minium hy­dride: cyclo-1,5-bis-μ-di­methyl­amino-3,7-di-μ-hy­drido-2,4,6,8-tetra­kis­(di­methyl­alu­minium)

The title com­pound crystallizes as eight-membered rings with –(CH₃)₂Al–(CH₃)₂N–(CH₃)₂Al– moieties connected by single hy­dride bridges. The mol­ecular structures and partial atomic charges determined both by X-ray methods and by DFT calculations are compared.

Fe^III in the high-spin state in di­methyl­ammonium bis­[3-eth­oxy­salicyl­aldehyde thio­semi­car­bazon­ato(2–)-κ³O²,N¹,S]ferrate(III)

The Fe^IIIS₂N₂O₂ chromophore contains two O,N,S-donating dianionic ligands in perpendicular planes, with the O and S atoms in cis and the N atoms in trans positions. The Fe^III ion is in the high-spin state at 100 K. The variable-tem­per­ature magnetic susceptibility measurements (5–320 K) are consistent with the presence of a high-spin S = 5/2 Fe^III ion.