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ISSN: 2414-3146

February 2024 issue

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Cover illustration: Vanillic acid (4-hy­droxy-3-meth­oxy­benzoic acid) is an aromatic phenolic acid widely used as a flavouring agent in the food industry. In addition to being a flavourant, this compound offers remarkable therapeutic effects and more recently has been reported to be a promising linker precursor towards novel coordination polymers. Prop-2-ynyl 3-meth­oxy-4-(prop-2-yn­yloxy)benzoate was investigated as an inter­mediate toward hydroxamic acid-type linker systems and was prepared via the alkyl­ation of 4-hy­droxy-3-meth­oxy­benzoic acid with propargyl bromide in the presence of K2CO3. There are two crystallographically independent mol­ecules in the asymmetric unit, linked via C—H⋯O inter­actions to form dimeric entities. The allylic groups are twisted out of the phenyl planes with dihedral angles varying between 7.92 (13) and 25.42 (8)°. In the crystal, the packing follows a zigzag pattern along the c-axis direction. See: Moodley, Muller & Belay [IUCrData (2023). 8, x240163]

metal-organic compounds

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In the cation of the title complex, the central palladium(II) atom is surrounded by two bidentate ligands, 2,2′-bi­pyridine and 4,4′-dimeth­oxy-2,2′-bi­pyridine, in a distorted square-planar environment.

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In the crystal structure of the title compound, the ruthenium(II) metal center is surrounded by two bidentate 2,2′-bi­pyridine, an isonicotinamide ligand, and a water in a distorted octa­hedral geometry. Hydrogen bonding is present between counter-ion and ligand.

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The structure of the title compound is triclinic containing half of the mol­ecule in the asymmetric unit. Each zinc atom is coordinated to a pyridyl and oxime nitro­gen from one ligand and a third nitro­gen from the other dpko pyridyl ring and two acetato anions.

organic compounds

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Both mol­ecules in the asymmetric unit of the title compound are twisted. In the crystal, weak C—H⋯π inter­actions link the mol­ecules into a three-dimensional network.

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The title compound, C14H12O4, was prepared via alkyl­ation of 4-hy­droxy-3-meth­oxy­benzoic acid with propargyl bromide in the presence of K2CO3.
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