catena-Poly[[[diaqua-(nitrato-κO,O')(2,2':6',2''-terpyridine-κN,N',N'')neodymium(III)]-μ-cyanido-κN:C-[dicyanidoplatinum(II)]-μ-cyanido-κC:N] acetonitrile solvate 2,2':6',2''-terpyridine hemisolvate]

Crystal structure, thermal and fluorescence properties of 2,2':6',2''-terpyridine-1,1',1''-triium tetra-chlorido-nickelate(II) chloride

The synthesis, and structural determination of 2,2′:6′,2′′-terpyridine-1,1′,1′′-triium tetra­chlorido­nickelate(II) chloride are reported. The crystal structure features N—H⋯Cl and C—H⋯Cl hydrogen bonds and Ni—Cl⋯π ring inter­actions.

The title compound, (C₁₅H₁₄N₃)[NiCl₄]Cl, comprises an Ni^II cation tetra­hedrally coordinated by four chloride anions, a non-coordinating chloride anion and an essentially planar terpyridinium trication (tpyH₃³⁺), in which the central pyridinium ring forms dihedral angles of 5.7 (2) and 6.0 (2)° with the peripheral pyridinium rings. Three inter-species N—H⋯Cl hydrogen bonds are formed with the Cl⁻ anion, which also forms a link between the (tpyH₃³⁺) cations through an aromatic C—H⋯Cl inter­action, forming a zigzag chain extending along the 2₁ (b) screw axis. Two of the anionic Cl atoms of the [NiCl₄]²⁻ anions form Ni—Cl⋯π inter­actions with separate pyridinium rings [Ni⋯Cg = 3.669 (3) and 3.916 (4) Å]. In the crystal, successive undulating inorganic and organic layers are formed, extending across the (100) plane. Thermogravimetric and differential thermal analysis (TGA/DTA) indicate that the compound starts to decompose at 313 K and may be a candidate for use as a blue-light luminescent material.

catena-Poly[[[diaqua-(nitrato-κO,O')(2,2':6',2''-terpyridine-κN,N',N'')ytterbium(III)]-μ-cyanido-κN:C-[dicyanido-platinum(II)]-μ-cyanido-κC:N] acetonitrile monosolvate]

The title compound, {[PtYb(CN)₄(NO₃)(C₁₅H₁₁N₃)(H₂O)₂]·CH₃CN}_n, was isolated from solution as a one-dimensional coordination polymer. The Yb³⁺ site has ninefold coordination with a distorted tricapped trigonal–prismatic geometry, while the Pt^II ion is coordinated by four cyanide groups in an almost regular square-planar geometry. cis-Bridging by the tetra­cyanidoplatinate(II) anions links the Yb³⁺ cations, forming chains. Additionally, each Yb³⁺ is coordinated by two water mol­ecules, one bidentate nitrate anion, and one tridentate 2,2′:6′,2′′-terpyridine mol­ecule. O—H⋯N hydrogen-bonding inter­actions are found between adjacent chains and help to consolidate the crystal packing. In addition, π–π stacking inter­actions exist between the terpyridine ligand and the two corresponding terpyridine ligands along the adjacent chain (average inter­planar distance = 3.667 Å). Moderate Pt⋯Pt inter­actions [3.5033 (4) Å] are observed in the structure.