Coordination mode of some polypyridyl ligands towards the platinum(II) complexes [Pt(dppf)(H2O)2](CF3SO3)2 (dppf=1,1′-bis(diphenylphosphino)ferrocene) and [Pt(Me2SO)2Cl2]. Crystal structure of the seven-membered chelate ring complex [Pt(dpq)Cl2] (dpq=2,3-di(2-pyridyl)quinoxaline)

Key indicators: single-crystal X-ray study; T = 200 K; mean (C-C) = 0.010 Å; R factor = 0.032; wR factor = 0.067; data-to-parameter ratio = 17.5.The Pt II ion in the title complex, [PtBr 2 (C 14 H 10 N 4 )], has a slightly distorted square-planar environment defined by the two pyridyl N atoms of the chelating 2,3-di-2-pyridylpyrazine ligand and two bromide anions. In the crystal, the pyridyl rings are considerably inclined to the least-squares plane of the PtBr 2 N 2 unit [maximum deviation = 0.064 (2) Å ] with dihedral angles of 65.2 (2) and 66.0 (2) . The nearly planar pyrazine ring [maximum deviation = 0.020 (5) Å ] is almost perpendicular to the unit plane with a dihedral angle of 89.2 (2) . Two independent weak intermolecular C-HÁ Á ÁBr hydrogen bonds, both involving the same Br atom as a hydrogen-bond acceptor, give rise to chains running along the a and b axes, forming a layer structure extending parallel to (001). The complexes are stacked in columns along the a axis. When viewed down the b axis, the successive complexes stack in the opposite direction. Related literature

Section: S1 Commentsupporting

confidence: 61%

“…For an isomer of the title complex, see: Ha (2011). For crystal structures of the related Pt II complexes, see: Granifo et al (2000); Cai et al (2009). Table 1 Selected bond lengths (Å ).…”

Section: Related Literaturementioning

confidence: 99%

Dibromido(2,3-di-2-pyridylpyrazine-κ²N²,N³)platinum(II)

2011

“…For related crystal structures of [PdX 2 (dpp)] (X = Cl, Br or I), see: Ha (2011a,b,c). For related Pt and Pd complexes, see: Granifo et al (2000); Cai et al (2009). Data collection: SMART (Bruker, 2000); cell refinement: SAINT (Bruker, 2000); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997) and PLATON (Spek, 2009); software used to prepare material for publication: SHELXL97.…”

Section: Related Literaturementioning

confidence: 99%

(2,3-Di-2-pyridylpyrazine-κ²N²,N³)bis(thiocyanato-κS)palladium(II)

2012

Key indicators: single-crystal X-ray study; T = 200 K; mean (C-C) = 0.008 Å; R factor = 0.046; wR factor = 0.100; data-to-parameter ratio = 14.4. The PdII ion in the title complex, [Pd(NCS) 2 (C 14 H 10 N 4 )], is four-coordinated in a distorted square-planar environment by the two pyridine N atoms of the chelating 2,3-di-2-pyridylpyrazine (dpp) ligand and two S atoms from two thiocyanate anions. The pyridine rings are considerably inclined to the least-squares plane of the PdS 2 N 2 unit [maximum deviation = 0.027 (1)

“…For the structure of the isotypic [PtBr 2 (2,3-di-2-pyridylpyrazine)] analog, see: Ha (2011). For related Pt II complexes, see: Granifo et al (2000); Cai et al (2009).…”

Section: Related Literaturementioning

confidence: 99%

Dichlorido(2,3-di-2-pyridylpyrazine-κ²N²,N³)palladium(II)

2011

The PdII ion in the title complex, [PdCl2(C14H10N4)], has a slightly distorted square-planar environment defined by the two pyridine N atoms of the chelating 2,3-di-2-pyridylpyrazine ligand and two chloride anions. The pyridine rings are considerably inclined to the least-squares plane of the PdCl2N2 unit [maximum deviation = 0.073 (1) Å], with dihedral angles of 64.19 (9) and 66.55 (9)°. The pyrazine ring is almost perpendicular to this plane and the dihedral angle is 88.2 (1)°. Two independent intermolecular C—H⋯Cl hydrogen bonds, both involving the same Cl atom as a hydrogen-bond acceptor, give rise to chains running along the a and b axes, generating 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.