Crystal structure of catena-poly[[aqua(2,2′:6′,2′′-terpyridine-κ³N,N′,N′′)cobalt(II)]-μ-cyanido-κ²N:C-[dicyanidoplatinum(II)]-μ-cyanido-κ²C:N]

The title compound, [Co(C₁₅H₁₁N₃)(H₂O){Pt(CN)₄}]_n, is a one-dimensional coordination polymer formed under hydro­thermal reaction conditions. The Co^II site has sixfold coordination with a distorted octa­hedral geometry, while the Pt^II ion is coordinated by four cyanide groups in an almost regular square-planar geometry. The compound contains twofold rotation symmetry about its Co^II ion, the water molecule and the terpyridine ligand, and the Pt^II atom resides on an inversion center. trans-Bridging by the tetra­cyanidoplatinate(II) anions links the Co^II cations, forming chains parallel to [-101]. Additionally, each Co^II atom is coordin­ated by one water mol­ecule and one tridentate 2,2′:6′,2′′-terpyridine ligand. O—H...N hydrogen-bonding inter­actions are found between adjacent chains and help to consolidate the crystal packing. In addition, relatively weak π–π stacking inter­actions exist between the terpyridine ligands of adjacent chains [inter­planar distance = 3.464 (7) Å]. No Pt...Pt inter­actions are observed in the structure.

Crystal structure of di-μ-benzato-κ⁴O:O′-bis­[aqua­(benzato-κO)(benzato-κ²O,O′)(2,2′:6′,2′′-terpyridine-κ³N,N′,N′′)europium(III)]–benzoic acid (1/2)

The title compound, [Eu₂(C₇H₅O₂)₆(C₁₅H₁₁N₃)₂(H₂O)₂]·2C₇H₆O₂, is a co-crystalline compound containing a dinuclear Eu^III coordination complex with inversion symmetry co-crystallized with benzoic acid in a 1:2 ratio. The Eu³⁺ ions within the dimer are nine-coordinate, containing one tridentate terpyridine, one water, and four benzoate ions, two of which bridge the Eu³⁺ ions. Of the four benzoate ligands coordinating to each Eu³⁺ position, three distinct coordination modes [monodentate, bidentate–chelating, and bidentate–bridging (twice)] are observed. Within the crystal, there are two additional uncoordinating benzoic acid mol­ecules per dinuclear complex. Within the dimer, the water bound to each Eu³⁺ ion participates in intra­molecular hydrogen bonding with a coordinating benzoate. Additionally, the carb­oxy­lic acid group on the benzoic acid participates in inter­molecular hydrogen bonding with a benzoate ligand bound to the dimer complex.

Crystal structure of bis­(2,2′:6′,2′′-terpyridine-κ³N,N′,N′′)nickel(II) dicyanidoaurate(I)

In an ionic compound composed of bis­(2,2′:6′,2′′-terpyridine)­nickel(II) dications and dicyanidoaurate(I) dianions in a 1:2 ratio, the two tridentate terpyridine ligands define the coordination of the Ni²⁺ cation, resulting in a nearly octa­hedral coordination sphere, although there is not any imposed crystallographic symmetry about the Ni²⁺ site.

Crystal structure of tri­phenyl(vinyl)­phospho­nium tetra­phenyl­borate

The title ionic salt, C₂₁H₂₀P⁺·C₂₄H₂₀B⁻, crystallized with two independent vinyl­tri­phenyl­phospho­nium cations and two independent tetra­phenyl­borate anions per asymmetric unit. These four independent moieties contain nearly perfect tetra­hedral symmetry about their respective central C atoms. In the crystal, there are no π-stacking or other inter­molecular inter­actions present.