Bis(acetonitrile-κN)(1,10-phenanthroline-κ2 N,N′)platinum(II) bis­(perchlorate)

The asymmetric unit of the title compound, [Pt(CH3CN)2(C12H8N2)](ClO4)2, contains one half of a cationic PtII complex and pair of half perchlorate anions, one of which is disordered over two sites in a 0.53 (3):0.47 (3) ratio. The complex and anions are disposed about a crystallographic mirror plane parallel to the ac plane passing through the Pt and Cl atoms. In the complex, the PtII ion lies in a distorted square-planar environment defined by four N atoms of the chelating 1,10-phenanthroline ligand and two distinct acetonitrile mol­ecules. The component ions inter­act by means of inter­molecular C—H⋯O hydrogen bonds

cis-(Di-2-pyridyl­amine-κ2 N 2,N 2′)bis­(thio­cyanato-κS)platinum(II)

In the title complex, [Pt(NCS)2(C10H9N3)], the PtII ion is four-coordinated in a distorted square-planar environment by the two pyridine N atoms of the chelating di-2-pyridyl­amine (dpa) ligand and two mutually cis S atoms from two linear thio­cyanate anions. The dpa ligand is not planar, the dihedral angle between the pyridine rings being 30.8 (4)°. In the crystal, the complex mol­ecules are stacked in columns along the a axis and are connected by inter­molecular N—H⋯N hydrogen bonds, forming supra­molecular chains along the b axis

Diiodido(1,10-phenanthroline-κ2 N,N′)platinum(II)

In the title complex, [PtI2(C12H8N2)], the Pt2+ ion is four-coordinated in a slightly distorted square-planar environment by two N atoms of the chelating 1,10-phenanthroline ligand and two iodide ions. The nearly planar mol­ecules, with a maximum deviation of 0.170 (3) Å from the least-squares plane, are stacked in columns along the c axis with a Pt⋯Pt distance of 4.8510 (6) Å. In the column, π–π inter­actions between adjacent six-membered rings are present, the shortest centroid–centroid distance being 3.703 (5) Å

(2,2′-Bipyridine-κ2 N,N′)diiodido­palladium(II)

The asymmetric unit of the title complex, [PdI2(C10H8N2)], contains one half of the formula unit. The Pd2+ ion is located on a twofold rotation axis and is four-coordinated in a slightly distorted square-planar environment by two N atoms of the chelating 2,2′-bipyridine ligand and two iodide ions. The compound displays inter­molecular π–π inter­actions between the pyridine rings of the ligand, the shortest centroid–centroid distance being 4.220 (4) Å

cis-(Acetonitrile-κN)aqua­bis­(2,2′-bipyrimidine-κ2 N 1,N 1′)manganese(II) cis-diaqua­bis­(2,2′-bipyrimidine-κ2 N 1,N 1′)manganese(II) tetrakis(perchlorate) dihydrate

The asymmetric unit of the title compound, [Mn(CH3CN)(C8H6N4)2(H2O)][Mn(C8H6N4)2(H2O)2](ClO4)4·2H2O, contains two distinct cationic MnII complexes, four perchlorate anions and two solvent water mol­ecules. In the two complexes, both MnII ions are six-coordinated in a distorted octa­hedral environment, but one Mn ion has a cis-N5O coordination geometry defined by four N atoms of the two chelating 2,2′-bipyrimidine (bpym) ligands, one N atom of a coordinating acetonitrile mol­ecule and one O atom of a water ligand, whereas the other Mn ion has a cis-N4O2 coordination geometry defined by four N atoms of the two bpym ligands and two O atoms of water ligands. In the crystal structure, the complex mol­ecules, anions and solvent water mol­ecules are linked by inter­molecular O—H⋯O and O—H⋯N hydrogen bonds. Three of the four perchlorate anions are disordered over two sets of sites in different ratios

Dibromido(1,10-phenanthroline-κ2 N,N′)palladium(II)

In the title complex, [PdBr2(C12H8N2)], the PdII ion is four-coordinated in a slightly distorted square-planar environment by two N atoms of the chelating 1,10-phenanthroline ligand and two bromide ions. The complex displays numerous inter­molecular π–π inter­actions between adjacent six-membered rings, the shortest centroid–centroid distance being 3.680 (4) Å. The nearly planar [maximum deviation 0.143 (2) Å] mol­ecules stack in columns parallel to (101) with a Pd⋯Pd distance of 4.8466 (9) Å

(2,3-Di-2-pyridyl­pyrazine-κ2 N 2,N 3)diiodidoplatinum(II)

The PtII ion in the title complex, [PtI2(C14H10N4)], exists in a distorted square-planar environment defined by the two pyridine N atoms of the chelating 2,3-di-2-pyridyl­pyrazine ligand and two iodide anions. The pyridine rings are inclined to the least-squares plane of the PtI2N2 unit [maximum deviation = 0.070 (3) Å] at 66.1 (2) and 65.9 (2)°; the pyrazine ring is perpendicular to this plane [dihedral angle = 89.7 (2)°]. Two inter­molecular C—H⋯I hydrogen bonds, both involving the same I atom as hydrogen-bond acceptor, generate a layer structure extending parallel to (001). Mol­ecules are stacked in columns along the a axis. Along the b axis, successive mol­ecules stack in opposite directions

A second monoclinic polymorph of (pyridine-2-carboxaldehyde oximato-κ2 N,N′)(pyridine-2-carboxaldehyde oxime-κ2 N,N′)palladium(II) chloride

The asymmetric unit of the title compound, [Pd(C6H5N2O)(C6H6N2O)]Cl, contains one half of a cationic PdII complex and a Cl− anion, with a crystallographic mirror plane parallel to the ac plane passing through the Pd and Cl atoms. In the complex, the PdII ion is four-coordinated in a distorted square-planar environment by four N atoms derived from the two chelating ligands. The hy­droxy H atom lies on the mirror plane and so is equidistant from the O atoms. This indicates that the negative charge is delocalized over the two O atoms. The complex mol­ecules are stacked in columns along the c axis and are connected by C—H⋯O hydrogen bonds, forming a three-dimensional network. The structure reported herein represents a new monoclinic polymorph of the previously reported monoclinic (C2/c) form [Torabi et al. (2007 ▶). Z. Kristallogr. New Cryst. Struct. 222, 197–198]

2,2′-Bipyrimidine-1,1′-diium bis­(tri­iodide)–2,2′-bipyrimidine–water (1/2/2)

In the crystal of the title compound, C8H8N4 2+·2I3 −·2C8H6N4·2H2O, inversion centres are located at the centroids of the central C—C bonds of the cation and the bpym mol­ecules, as well as at the central I atoms of both anions. Inter­molecular O—H⋯N and N—H⋯O hydrogen bonds are observed in the crystal structure

cis-Bis(2,2′-bipyrimidine-κ2 N 1,N 1′)dibromidomanganese(II) nitro­methane monosolvate

The asymmetric unit of the title compound, [MnBr2(C8H6N4)2]·CH3NO2, contains one half of a neutral MnII complex and one half of a nitro­methane solvent mol­ecule, the complete mol­ecules being generated by the application of twofold symmetry. In the complex, the MnII ion has a distorted cis-Br2N4 octa­hedral coordination geometry defined by four N atoms of the two chelating 2,2′-bipyrimidine ligands and two Br− ions. There are intra- and inter­molecular C—H⋯Br and C—H⋯N contacts