4,7,13,18-Tetra­oxa-1,10-diazo­nia­bicyclo­[8.5.5]icosane bis­(hexa­fluorido­phosphate)

The asymmetric unit of the title structure, C14H30N2O4 2+·2PF6 −, contains the anion and half of the cation, the latter being completed by a crystallographic twofold axis. The cation has a cage structure with the ammonium H atoms pointing into the cage. These H atoms are shielded from inter­molecular inter­actions and form only intra­molecular contacts. There are short inter­molecular C—H⋯F inter­actions in the structure, but no conventional inter­molecular hydrogen bonds

4,7,13,18-Tetra­oxa-1,10-diazo­nia­bicyclo­[8.5.5]icosane hexa­fluorido­silicate

The asymmetric unit of the title molecular salt, C14H30N2O4 2+·SiF6 2−, contains half of both the anion and the cation, both ions being completed by a crystallographic twofold axis passing through the Si atom. The cation has a cage structure with the ammonium H atoms pointing into the cage. These H atoms are shielded from inter­molecular inter­actions and form only intra­molecular contacts. There are short inter­molecular C—H⋯F inter­actions in the structure, but no conventional inter­molecular hydrogen bonds

Poly[tris­(μ-2-amino­benzene-1,4-dicarboxyl­ato)tetra­kis­(N,N-dimethyl­formamide)­diyttrium(III)]

The asymmetric unit of the title coordination polymer, [Y2(C8H5NO4)3(C3H7NO)4]n, contains one Y3+ ion, three half-mol­ecules of the 2-amino­benzene-1,4-dicarboxyl­ate (abz) dianion and two O-bonded N,N-dimethyl­formamide (DMF) mol­ecules. Each abz half-mol­ecule is completed by crystallographic inversion symmetry and its –NH2 group is disordered in each case [relative occupancies within the asymmetric unit = 0.462 (18):0.538 (18), 0.93 (2):0.07 (2) and 0.828 (16):0.172 (16)]. The combination of disorder and crystal symmetry means that each of the four C—H atoms of the benzene ring of each of the dianions bears a statistical fraction of an –NH2 group. The coordination geometry of the yttrium ion is a fairly regular YO8 square anti­prism arising from its coordination by two DMF mol­ecules, four monodentate abz dianions and one O,O-bidentate abz dianion. The polymeric building unit is a dimeric paddle-wheel with two metal ions linked by four bridging abz dianions. Further bridging linkages connect the dimers into a three-dimensional framework containing voids in which highly disordered DMF mol­ecules are presumed to reside

(5,5′-Dimethyl-2,2′-bipyridine)­iodido­trimethyl­platinum(IV)

In the title compound, [Pt(CH3)3I(C12H12N2)], the PtIV atom is six-coordinated in a slightly distorted octa­hedral configuration with one CH3 group and the I atom forming a near perpendicular axis relative to the square plane formed by the bipyridine ligand and the two remaining CH3 groups. The CH3 group trans to the I atom has a slightly elongated bond to Pt compared to the other CH3 groups, indicating a difference in trans influence between iodine and the bipyridine ligand

Crystal structure of catena-poly[[[aqua­bis­(di­methyl­formamide-κO)magnesium(II)]-μ3-(2,2′-bi­pyridine-5,5′-di­carboxyl­ato-κ5O2:O2′:N,N′:O5)-[di­chlorido­platinum(II)]] di­methyl­formamide monosolvate]

The title compound, {[MgPtCl2(C12H6N2O4)(C3H7NO)2(H2O)] C3H7NO}n, is a one-dimensional coordination polymer. The structure consists of Pt-functionalized bipyridine ligands connected by MgII cations, as well as coordinating and non-coordinating solvent molecules. The PtII cation is coordinated by the two N atoms of the bipyridine moiety and two Cl atoms in a square-planar fashion. This coordination induces an in-plane bend along the bipyridine backbone of approximately 10° from the linear ideal of a conjugated pi-system. Likewise, the coordination to the MgII cation induces a significant bowing of the plane of the bipyridine of about 12°, giving it a distinct curved appearance. The carboxylate groups of the bipyridine ligand exhibit moderate rotations relative to their parent pyridine rings. The MgII cation has a fairly regular octahedral coordination polyhedron, in which three vertices are occupied by O atoms from the carboxylate groups of three different bipyridine ligands. The remaining three vertices are occupied by the O atoms of two dimethylformamide (DMF) molecules and one water molecule. The onedimensional chains are oriented in the [011] direction, and non-coordinating DMF molecules can be found in the space between the chains. The shortest intermolecular O-H contacts are 2.844 (4) and 2.659 (4) Å, suggesting moderate hydrogen-bonding interactions. In addition, there is a short intermolecular Pt-Pt contact of 3.491 (1) Å, indicating a Pt stacking interaction. Some structure-directing contribution from the hydrogen bonding and Pt-Pt interaction is probable. However, the crystal packing seems to be directed primarily by van der Waals interactions

Di-μ-chlorido-bis[2,2'-bipyridine-5,5'-dicarboxylic acid-κ2N,N')chloridocopper(II)]dimethylformamide tetrasolvate

This open-access article is distributed under the terms of the Creative Commons Attribution Licenc

The Suzuki–Miyaura Cross-Coupling as the Key Step in the Synthesis of 2-Aminobiphenyls and 2,2'-Diaminobiphenyls: Application in the Synthesis of Schiff Base Complexes of Zn

2‐Nitrophenylboronic acids serve as interesting starting materials for the construction of biphenyl‐ and terphenyl‐based amines if subjected to the Suzuki–Miyaura reaction. Unfortunately, these boronic acids suffer from low reactivity in Suzuki reactions, alongside their low stability in the presence of Pd. Herein, a general method for the construction of 2‐nitro‐substituted bi‐ and terphenyls is presented, with special emphasis on the synthesis of 2‐amino‐2'‐nitrobi‐ and terphenyls. Comparisons are made with other boronic acids that have some of the aforementioned issues. Finally, the application of the obtained 2‐amino‐2'‐nitrobi‐ and terphenyls as starting materials for the synthesis of bi‐ and terphenyl based di‐ and triamines is encountered for, with emphasis on the use of these amines as precursors for Schiff base ligands. In addition, the synthesis of some Zn complexes of these ligands is presented

A highly asymmetric gold(III) η3‐allyl complex

A highly asymmetric AuIII η3‐allyl complex has been generated by treating Au(η1‐allyl)Br(tpy) (tpy=2‐(p‐tolyl)pyridine) with AgNTf2. The resulting η3‐allyl complex has been characterized by NMR spectroscopy and X‐ray crystallography. DFT calculations and variable temperature 1H NMR suggest that the allyl ligand is highly fluxional.publishedVersio