issue contents
May 2024 issue
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Cover illustration: In the structure of the complex (5-fluoro-2,6-dioxo-1,2,3,6-tetrahydropyrimidin-1-ido-κN1)(1,4,8,11-tetraazacyclotetradecane-κ4N)zinc(II) perchlorate, the zinc(II) ion forms coordination bonds with the four nitrogen atoms of cyclam (1,4,8,11-tetraazacyclotetradecane or [14]aneN4) as well as with the nitrogen atom of a deprotonated 5-fluorouracil ion (FU−). Cyclam adopts a trans-I type conformation within this structure. The coordination structure of the zinc(II) ion is a square pyramid with a distorted base plane formed by the four nitrogen atoms of the cyclam. FU− engages in intermolecular hydrogen bonding with neighboring FU− molecules and with the cyclam molecule. See: Ichimaru, Kato, Jin, Kurihara & Kurosaki [IUCrData (2024). 8, x240431]
inorganic compounds
Na2(Fe2/3Te4/3)O6 was obtained under hydrothermal conditions and adopts the ilmenite (FeTiO3) structure type.
metal-organic compounds
The crystal structure of the title complex is stabilized by intermolecular O—H⋯Cl hydrogen bonds, forming
![[R_{2}^{2}]](/x/issues/2024/05/00/bx4028/teximages/bx4028fi1.svg)
(18) ring motifs.
In the structure of the title complex, the zinc(II) ion forms coordination bonds with the four nitrogen atoms of cyclam as well as with the nitrogen atom of a deprotonated 5-fluorouracil ion. Cyclam adopts a trans-I type conformation within this structure. The coordination structure of the zinc(II) ion is a square pyramid with a distorted base plane formed by the four nitrogen atoms of the cyclam.
The crystal structure of the title complex features O—H⋯O hydrogen bonds, which form
![[R_{2}^{2}]](/x/issues/2024/05/00/wm4213/teximages/wm4213fi1.svg)
(8),
![[R_{4}^{4}]](/x/issues/2024/05/00/wm4213/teximages/wm4213fi2.svg)
(16),
![[R_{4}^{4}]](/x/issues/2024/05/00/wm4213/teximages/wm4213fi2.svg)
(20) and
![[R_{4}^{4}]](/x/issues/2024/05/00/wm4213/teximages/wm4213fi2.svg)
(22) ring motifs.
The molecular structure of Sn(NHMes)4 is defined by a central tin(IV) atom that is coordinated by four NHMes groups in a distorted tetrahedral arrangement.
(C8H20N)8[Mo10O34] comprises a centrosymmetric decamolybdate polyanion linked through N—H⋯O hydrogen bonds to dibutylammonium counter-cations.
organic compounds
The title compound forms a sheet structure of dimers exhibiting intra- and intermolecular hydrogen bonds.
The molecule is a zwitterion, with a protonated α-amino group and a deprotonated α-carboxyl group. Within the crystal, the molecules are linked by a system of hydrogen bonds formed by both the protonated and deprotonated carboxylic groups, and the protonated ammonium group.
The N—H group of the title compound does not form a hydrogen bond due to steric hindrance.
In the crystal of the title compound, the molecules are connected through C—H⋯O hydrogen bonds, generating [100] chains, which are crosslinked by weak π–π stacking interactions.