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ISSN: 2414-3146

September 2020 issue

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Cover illustration: The field of cooperative catalysis has given scientists the ability to access more complex mol­ecular transformations using cheaper, readily available metals. The compound 2,2'-oxybis[1,3-bis­(4-meth­oxy­phen­yl)-2,3-di­hydro-1H-benzo[d][1,3,2]di­aza­borole] was synthesized using elements from the main group of the periodic table, which are cheaper and more accessible than the traditionally used transition metals. It has a pincer-like orientation formed by an oxygen single-atom bridge connected to two Lewis-acidic boron centers. The di­amine moieties bound to the boron atoms provide redox-active sites, which give the structure the electron equivalents that boron lacks while also modulating the steric environment. The pincer shape might allow the compound to use the boron atoms and the redox-active ligands to create a binding pocket for coordination and bridging of a small mol­ecule substrate. See: Mallard, Kennedy, Rudman, Greenwood, Nicoleau, Angle, Torquato, Gau, Carroll & Anstey [IUCrData (2020). 5, x201248].

inorganic compounds


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The crystal structure of sodium ammonium sulfate dihydrate has been redetermined at 170 K on the basis of single-crystal X-ray data.

metal-organic compounds


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The crystal structure of Zr(C12H22N)4 is isotypic with its cerium(IV) analogue.

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The nickel(II) atom in the cation of the title salt has a slightly distorted octa­hedral coordination environment defined by two O and four N atoms.

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[Os2(CO)4(tri-p-tolyl­phosphine)2]24-adamantane-1,3-di­carboxyl­ate)2 is a mol­ecular loop consisting of two parallel diosmium(I) sawhorse units linked together by two bridging di­carboxyl­ato ligands. The title compound is only the second example of a Group 8 dinuclear sawhorse complex with an adamantane-based di­carboxyl­ato ligand.

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In the title compound, the coordinated water mol­ecules are in a cis disposition and the Cp rings of the ferrocene groups are close to eclipsed.

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Both ions in the title compound lie across centres of inversion, with the anion being statistically disordered.

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The title compound structure is a unique example of a zinc(II) metal center surrounded by a tridentate chloro­terpyridine ligand, a chloride and a coordinated tri­fluoro­methane­sulfonate in a distorted square-pyramidal geometry.

organic compounds


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In the title flavanone, the mol­ecules are linked by weak C—H⋯O inter­actions into [101] chains.

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In the title compound, the mean planes of the pendant benzene rings are approximately perpendicular to one another, making a dihedral angle of 79.3 (5)°; the indeno­[1,2-b]quinoxaline ring system is twisted with respect to the pendant benzene rings by 70.0 (4) and 67.6 (3)°.

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The synthesis and structure of 1H-indole-2-carboxyl­ate is presented.

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A polymorphic modification of the title steroidal compound, derived from diosgenin, results from a conformational alteration for the A/B ring system.

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In the title compound, the dihedral angle between the pyridine and di­fluoro­benzene rings is 45.12 (12)°.

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In the title 2:1 co-crystal, the complete succinic acid mol­ecule is generated by a crystallographic centre of symmetry.

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Hydrogen-bonded sheets occur in the centrosymmetric crystal structure of the title compound.


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In the crystalline state of the title solvate, C18H13NO3·C4H8O, hydrogen-bonding inter­actions between hydroxyl groups on a phenoxazine backbone and the tetra­hydro­furan solvent are observed that suggest the ability for this compound to act as a chelating ligand.

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The mol­ecules of the title compound, C26H48N4Si3, are linked via an SiC–H⋯π(ar­yl) inter­action in the crystal.

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In the title compound, C11H17BrO2, a cyclo­octene ring in a twist-boat conformation and a dioxolane ring with a distorted envelope conformation are annulated in a trans configuration. Alternating strands of single enanti­omers build up the crystal. Within the strands, the mol­ecules are connected by weak C—H⋯O hydrogen bonds.
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