A pentanuclear {Co5} cluster motif forming a capped breathing kagomé lattice

A new pentanuclear {Co5} cluster motif is found to have a D3h oblate trigonal bipyramidal geometry, which is extended into a 3D triangle network, forming a unique capped breathing kagomé...

Crystal structure of [tris(pyridin-2-ylmethyl)amine-κ4N]copper(II) bromide

In the asymmetric unit of the title compound, [CuBr(C18H18N4)]Br, there are three crystallographically independent cations. One of the cations exhibits positional disorder of the pyridin-2-ylmethyl groups over two sets of sites with refined occupancies of 0.672 (8) and 0.328 (8). The outer-sphere bromine counter-ion is severely disordered over multiple sites. In each cation, the CuIIion is coordinated by the four N atoms of the tris(pyridin-2-ylmethyl)amine ligand and one bromine and adopts a slightly distorted trigonal–bipyramidal geometry.

Crystal structure of bis(μ2-tetrabromophthalato-κ2O1:O2)bis[aqua(N,N,N′,N′-tetramethylethane-1,2-diamine-κ2N,N′)copper(II)]

In the title complex, [Cu2(C8Br4O4)2(C6H16N2)2(H2O)2], the CuIIcation is chelated by a tetramethylethane-1,2-diamine ligand and coordinated by a water molecule as well as bridged by two tetrabromophthalate anions in a distorted O3N2trigonal–bipyramidal geometry. The two symmetry-related tetrabromophthalate anions bridge the two CuIIcations, forming a centrosymmetric dinuclear complex in which the Cu...Cu separation is 5.054 (2) Å. Intramolecular classic O—H...O hydrogen bonds and weak C—H...O hydrogen bonds occur in the dinuclear molecule. In the crystal, the molecules are linked by weak C—H...Br and C—H...O interactions into supramolecular chains propagating along theb-axis direction.

Crystal structure ofcatena-poly[[chlorido(4,4′-dimethyl-2,2′-bipyridine-κ2N,N′)copper(II)]-μ-chlorido]

The title compound, [CuCl2(C12H12N2)]n, was obtainedviaa DMSO-mediated dehydration of Cu(4,4′-dimethyl-2,2′-bipyridine)copper(II)·0.25H2O. The central CuIIatom is coordinated in a distorted trigonal–bipyramidal geometry by two N atoms of a chelating 4,4′-dimethyl-2,2′-bipyridine ligand [average Cu—N = 2.03 (3) Å] and three Cl atoms, one terminal with a short Cu—Cl bond of 2.2506 (10) Å, and two symmetry-equivalent and bridging bonds. The bridging Cl atom links the CuIIions into chains parallel to [001]viaone medium and one long Cu—Cl bond [2.3320 (10) and 2.5623 (9) Å]. The structure displays both inter- and intramolecular C—H...Cl hydrogen bonding.

Tuning the Ising-type anisotropy in trigonal bipyramidal Co(ii) complexes

Imposing a trigonal bipyramidal geometry to a central Co(ii) ion with long equatorial Co–S bonds results in a complex that exhibits large Ising-type anisotropy.

Synthesis and first use of pyridine-2,6-diylbis(pyrazine-2-ylmethanone) in metal cluster chemistry: a {MnIII3Na2} complex with an ideal trigonal bipyramidal geometry

A new {Mn3Na2} compound with trigonal bipyramidal topology was obtained from a metal-assisted transformation of the ligand (pz)CO(py)CO(pz).

{4-Amino-N′-[(2-oxidonaphthalen-1-yl)methylidene]benzohydrazidato}dimethyltin(IV)

In the title compound, [Sn(CH3)2(C18H13N3O2)], the SnIVion is coordinated by one N and two O atoms from the tridentate 4-amino-N′-[(2-oxidonaphthalen-1-yl)methylidene]benzohydrazidate(2−) ligand and two C atoms from methyl ligands in a distorted trigonal–bipyramidal geometry. The dihedral angle between the naphthalene ring system and the benzene ring is 19.2 (2)°. In the crystal, weak N—H...O hydrogen bonds link the molecules into zigzag chains along [010].

Bis(2,2′-bipyridyl-κ2N,N′)chloridonickel(II) nitrate trihydrate

In the title hydrated salt, [NiCl(C10H8N2)2](NO3)·3H2O, the Ni2+ion is coordinated by two 2,2′-bipyridyl (2,2′-bpy) ligands and a chloride ion in a trigonal–bipyramidal geometry. The chloride ion occupies an equatorial site and the dihedral angle between the 2,2′-bpy ring systems is 72.02 (6)°. In the crystal, the components are linked by C—H...O and O—H...O hydrogen bonds and aromatic π–π stacking interactions [shortest centroid–centroid separation = 3.635 (2) Å], generating a three-dimensional network.

A new polymorph of aquabis(1,10-phenanthroline-κ2N,N′)copper(II) dinitrate

The title molecule, [Cu(C12H8N2)2(H2O)](NO3)2, is a new polymorph of a compound which up to now has been reported to crystallize space groups inC2/candCc. The crystal studied was twinned by non-merohedry (final BASF factor of 0.40043) with the structure being solved and refined inP-1. The CuIIatom is coordinated by four N atoms from two 1,10-phenanthroline ligands and an O atom from a water molecule in an approximate trigonal–bipyramidal geometry. Discrete entities of one cation and two nitrate anions are formed by water–nitrate O—H...O hydrogen bonds. The components are further assembled into a three-dimensional network by C—H...O hydrogen bonds.