issue contents
July 2024 issue
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Cover illustration: Complexes of 1,4,7,10-tetraazacyclododecane (cyclen or [12]aneN4) derivatives with ZnII have been used as biological probes to elucidate the intrinsic roles of ZnII in enzyme models such as phosphatase, alcohol dehydrogenase, and β-lactamase. Cyclen conjugated with the anthracenyl methyl group has been developed as a fluorescent chemosensor for detecting pH and transition-metal cations in aqueous solution. In this context, the crystal structure of the salt, [1-(anthracen-9-ylmethyl)-1,4,7,10-tetraazacyclododecane]chloridozinc(II) nitrate is reported. The crystal structure comprises a [Zn(C23H30N4)Cl]+ complex cation and a nitrate anion. The coordination environment around the ZnII atom is slightly distorted square-pyramidal. The anthracene group attached to cyclen contributes to the crystal packing through intermolecular T-shaped π interactions. Additionally, the nitrate anion participates in intermolecular N—H⋯O hydrogen bonds with cyclen. See: Ichimaru, Sugiura, Kato, Kondo, Kurihara, Jin, Imai & Kurosaki [IUCrData (2024). 8, x240665].
metal-organic compounds
The reaction of 2-(benzotriazol-1-yl) acetic acid with CoCl2 at room temperature in ethanol generates the title three-dimensional cobalt-based coordination polymer.
The title compound is a ruthenium–gallium metal cluster. The ruthenium and gallium have a direct metal–metal bond with a length of 2.4575 (2) Å.
The title compound is a binuclear complex of molybdenum with a ethylenediaminetretraacetate ligand bridging two MoO3 units.
The ZnII atom in the complex cation of the title salt has a square-pyramidal coordination environment defined by four nitrogen atoms from cyclen (1,4,7,10-tetraazacyclododecane) in the basal plane and one chlorido ligand in the apical position.
The Pd atom is coordinated by two nitrogen atoms from two trans-aligned imine ligands and two chlorine atoms in an essentially square-planar environment.
A new neutral triazole-based N-heterocyclic carbene rhodium(I) complex [RhCl(C8H12)(C8H15N3)], has been synthesized and structurally characterized. The complex crystallizes with two molecules in the asymmetric unit. The rhodium center has a distorted square-planar conformation, formed by a cycloocta-1,5-diene (COD) ligand, an N-heterocyclic carbene (NHC) ligand, and a chloride ligand.
The title compound, [Ru(C12H14NO2)Cl(η6-C6H6)], exhibits a half-sandwich tripod stand structure and crystallizes in the orthorhombic space group P212121. The arene group is η6 π-coordinated to the Ru atom with a centroid-to-metal distance of 1.6590 (5) Å, with the (S)-2-(4-isopropyl-4,5-dihydrooxazol-2-yl)phenolate chelate ligand forming a bite angle of 86.88 (19)° through its N and phenolate O atoms.