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1.  [1,4-Bis(di­phenyl­phosphan­yl)butane-κ2 P,P′]di­bromido­palladium(II) 
In the title complex, [PdBr2(C28H28P2)], the PdII ion has a distorted cis-Br2P2 square-planar coordination geometry defined by two P atoms from the chelating 1,4-bis­(di­phenyl­phosphan­yl)butane ligand and two Br− anions. The four phenyl rings are inclined to the least-squares plane of the PdBr2P2 unit [maximum deviation = 0.1294 (7) Å], making dihedral angles of 66.3 (2), 87.2 (2), 68.8 (2) and 86.8 (2)°. The butyl­ene chain is in a gauche conformation, with a C—C—C—C torsion angle of 57.0 (8)°. Inter­molecular C—H⋯Br hydrogen bonds link the complex mol­ecules into supra­molecular layers in the ab plane. Weak π–π inter­actions, both intra- and inter­molecular [shortest inter-centroid distance = 4.598 (5) Å], are also noted in the three-dimensional architecture.
doi:10.1107/S1600536814000774
PMCID: PMC3998252  PMID: 24764813
2.  cis-Dibromidobis(2-phenyl­pyridine-κN)platinum(II) 
In the title complex, [PtBr2(C11H9N)2], the PtII ion has a distorted cis-Br2N2 square-planar coordination geometry defined by two N atoms from two 2-phenyl­pyridine (ppy) ligands and two Br− anions. The ppy ligands are not planar, the dihedral angles between the pyridine and benzene rings being 49.0 (3) and 47.3 (3)°. In the crystal, the complex mol­ecules are stacked in columns along the a axis. In the columns, there are numerous intra- and inter­molecular π–π inter­actions between the six-membered rings, the shortest ring centroid–centroid distance being 3.774 (6) Å.
doi:10.1107/S160053681203471X
PMCID: PMC3435592  PMID: 22969465
3.  (Di-2-pyridyl­amine-κ2 N 2,N 2′)diiodidopalladium(II) 
The PdII ion in the title complex, [PdI2(C10H9N3)], is four-coordinated in a distorted square-planar environment defined by the two pyridine N atoms of the chelating di-2-pyridyl­amine (dpa) ligand and two I− anions. The dpa ligand is not planar, the dihedral angle between the pyridine rings being 51.2 (2)°. In the crystal, pairs of complex mol­ecules are assembled through inter­molecular N—H⋯I hydrogen bonds into dimeric species. The complexes are stacked in columns along the b axis and display several inter­molecular π–π inter­actions between the pyridine rings, with a shortest ring centroid–centroid distance of 3.957 (3) Å.
doi:10.1107/S1600536812033946
PMCID: PMC3435574  PMID: 22969447
4.  Bis(di-2-pyridyl­amine-κ2 N 2,N 2′)palladium(II) bis­(thio­cyanate) 
The PdII atom of the title salt, [Pd(C10H9N3)2](NCS)2, lies on a center of inversion and exists in a square-planar environment defined by the four pyridine N atoms derived from the two chelating di-2-pyridyl­amine (dpa) ligands. The chelate ring displays a boat conformation with a dihedral angle between the pyridine rings of 43.0 (1)°. Adjacent thio­cyanate ions are linked to the cations by N—H⋯N hydrogen bonds.
doi:10.1107/S1600536812033958
PMCID: PMC3435575  PMID: 22969448
5.  Tetra­bromido(di-2-pyridyl­amine-κ2 N 2,N 2′)platinum(IV) 
The PtIV ion in the title complex, [PtBr4(C10H9N3)], is six-coordinated in a slightly distorted octa­hedral environment by two pyridine N atoms from a chelating di-2-pyridyl­amine (dpa) ligand and four Br− anions. The complex mol­ecule has mirror symmetry, with the PtIV atom, two Br atoms and the central N atom of the dpa ligand lying on the mirror plane. The dpa ligand is not planar, showing a dihedral angle of 34.7 (2)° between the pyridine rings. The complex mol­ecules are connected by inter­molecular N—H⋯Br hydrogen bonds, forming chains along [001]. Inter­molecular C—H⋯Br hydrogen bonds and π–π inter­actions between the pyridine rings [centroid–centroid distance = 3.667 (4) Å] are also observed.
doi:10.1107/S160053681203379X
PMCID: PMC3435571  PMID: 22969444
6.  (2,2′-Bipyrimidine-κ2 N 1,N 1′)diiodidopalladium(II) 
In the title complex, [PdI2(C8H6N4)], the PdII ion is four-coordinated in a slightly distorted square-planar environment defined by two pyrimidine N atoms derived from a chelating 2,2′-bipyrimidine (bpym) ligand and two mutually cis iodide anions. The nearly planar bpym ligand [maximum deviation = 0.053 (3) Å] is slightly inclined to the least-squares plane of the PdI2N2 unit [maximum deviation = 0.055 (2) Å], making a dihedral angle of 3.9 (2)°. In the crystal, pairs of complex mol­ecules are assembled by inter­molecular C—H⋯N hydrogen bonds into dimers. Intra­molecular C—H⋯I hydrogen bonds are also observed.
doi:10.1107/S1600536812028292
PMCID: PMC3393225  PMID: 22807793
7.  (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.
doi:10.1107/S1600536812023501
PMCID: PMC3379175  PMID: 22719373
8.  2-Eth­oxy-6-{[1-(3-eth­oxy-2-hy­droxy­benz­yl)-1H-benzimidazol-2-yl]meth­yl}phenol nitro­methane monosolvate 
In the title solvate, C24H24N2O4·CH3NO2, the benzene ring of the 2-eth­oxy-6-methyl­phenol substituent is approximately perpendicular to the nearly planar benzimidazole ring [maximum deviation = 0.021 (2) Å], making a dihedral angle of 84.32 (7)°. The benzene ring of the 2-eth­oxy­phenol group is somewhat inclined to the benzimidazole ring plane by 28.03 (5)°. The dihedral angle between the benzene rings is 82.20 (9)°. The compound reveals strong intra­molecular O—H⋯N and O—H⋯O hydrogen bonds, forming six- and five-membered rings, respectively. In the crystal, mol­ecules are connected by bifurcated O—H⋯(O,O) hydrogen bonds, forming chains along the b axis.
doi:10.1107/S1600536812023665
PMCID: PMC3379470  PMID: 22719668
9.  (2,2′-Bipyrimidine-κ2 N 1,N 1′)bis­(thio­cyanato-κN)platinum(II) 
In the title complex, [Pt(NCS)2(C8H6N4)], the PtII ion is four-coordinated in a distorted square-planar environment defined by two pyrimidine N atoms derived from a chelating 2,2′-bipyrimidine (bpym) ligand and two mutually cis N atoms from two SCN− anions. The thio­cyanate ligands are almost linear, displaying N—C—S bond angles of 178.6 (11) and 173.7 (11)°, and the N atoms are slightly bent coordinated to the Pt atom with Pt—N—C bond angles of 172.7 (9) and 160.4 (10)°. In the crystal, mol­ecules are held together by C—H⋯S hydrogen bonds. Intra­molecular C—H⋯N hydrogen bonds are also observed
doi:10.1107/S1600536812017552
PMCID: PMC3344397  PMID: 22590159
10.  A monoclinic polymorph of (R,R)-4,4′-dibromo-2,2′-[cyclo­hexane-1,2-diylbis(nitrilo­methanylyl­idene)]diphenol 
The title compound, C20H20Br2N2O2, a tetra­dentate Schiff base, is the enanti­omerically pure R,R-diastereomer of four possible stereoisomers. The mol­ecular structure reveals two strong intra­molecular O—H⋯N hydrogen bonds between the hy­droxy O atom and the imino N atom, which each generate S(6) rings. In the crystal, mol­ecules are stacked in columns along the a axis; when viewed down the b axis, successive columns are stacked in the opposite direction. The structure reported herein is the monoclinic polymorph of the previously reported ortho­rhom­bic form [Yi & Hu (2009 ▶). Acta Cryst. E65, o2643], in which the complete mol­ecule is generated by a crystallographic twofold axis.
doi:10.1107/S1600536812016376
PMCID: PMC3344566  PMID: 22590328
11.  Dipotassium tetra­kis­(thio­cyanato-κS)palladate(II)–(2,2′-bipyrimidine-κ2 N 1,N 1′)bis­(thio­cyanato-κS)palladium(II) (1/2) 
The asymmetric unit of the title compound, K2[Pd(NCS)4]·2[Pd(NCS)2(C8H6N4)], contains two crystallographically independent half-mol­ecules of the anionic PdII complex, two K+ cations and two independent neutral PdII complexes; an inversion centre is located at the centroid of each anionic complex. In the anionic complexes, each PdII ion is four-coordinated in an almost regular square-planar environment by four S atoms from four SCN− anions, and the PdS4 unit is exactly planar. In the neutral complexes, the PdII ion has a slightly distorted square-planar coordination environment defined by two pyrimidine N atoms derived from a chelating 2,2′-bipyrimidine ligand and two mutually cis S atoms from two SCN− anions. Both 2,2′-bipyrimidine ligands are almost planar [dihedral angle between the rings = 3.98 (16) and 4.57 (17)°] and also chelate to a potassium ion from their other two N atoms. In the crystal, the K+ ions inter­act with various S and N atoms of the ligands, forming a three-dimensional polymeric network, in which the shortest K⋯K contacts between the KN7S polyhedra are 4.4389 (17) and 4.4966 (18) Å. Intra- and inter­molecular C—H⋯S and C—H⋯N hydrogen bonds are also observed.
doi:10.1107/S1600536812015383
PMCID: PMC3344351  PMID: 22590117
12.  (2,2′-Biquinoline-κ2 N,N′)dibromidopalladium(II) 
The PdII ion in the title complex, [PdBr2(C18H12N2)], is four-coordinated in a distorted square-planar environment by the two N atoms from the chelating 2,2′-biquinoline (Biqu) ligand and two mutually cis Br− anions. The Biqu ligand is not planar, the dihedral angle between the quinoline systems being 17.2 (2)°. In the crystal, the complex mol­ecules are connected by C—H⋯Br hydrogen bonds, forming chains along the c axis. When viewed down the b axis, successive chains are stacked in opposite directions. Intra­molecular C—H⋯Br hydrogen bonds are also observed.
doi:10.1107/S1600536812015425
PMCID: PMC3344352  PMID: 22590118
13.  2-Eth­oxy-6-[1-(3-eth­oxy-2-hy­droxy­benz­yl)-2,3-dihydro-1H-benzimidazol-2-yl]phenol acetonitrile monosolvate 
The title compound, C24H24N2O4·CH3CN, a disubstituted benzimidazole, crystallized as an acetonitrile monosolvate. The benzene ring of the 2-eth­oxy-6-methyl­phenol substiuent is approximately perpendicular to the nearly planar benzimidazole ring system [maximum deviation = 0.016 (1) Å], making a dihedral angle of 84.27 (8)°. The benzene ring of the 2-eth­oxy­phenol substituent is inclined to the benzimidazole mean plane by 29.68 (8)°. The dihedral angle between the benzene rings is 80.36 (9)°. In the mol­ecule, there are strong O—H⋯N and O—H⋯O hydrogen bonds. In the crystal, mol­ecules are connected by bifurcated O—H⋯(O,O) hydrogen bonds, forming chains propagating along [010].
doi:10.1107/S1600536812015449
PMCID: PMC3344524  PMID: 22590286
14.  4,4′-Dinitro-2,2′-[propane-1,3-diylbis(iminiumylmethanylyl­idene)]diphenolate 
The title compound, C17H16N4O6, is a Schiff base, which is found as a bis-zwitterion in the solid state. The geometry around the iminium N atom indicates sp 2-hybridization. The diiminiumpropyl­ene chain is in an approximate double-gauche conformation, with average N—C—C—C torsion angles of 69.3°. The zwitterion shows strong intra­molecular N—H⋯O hydrogen bonds between the iminium N and phenolate O atom. In the crystal, bifurcated N—H⋯(O,O) hydrogen bonds assemble pairs of molecules into inversion dimers.
doi:10.1107/S1600536812015504
PMCID: PMC3344525  PMID: 22590287
15.  trans-Dichloridobis(quinoline-κN)platinum(II) 
In the title complex, trans-[PtCl2(C9H7N)2], the PtII ion is four-coordinated in an essentially square-planar coordination environment defined by two N atoms from two quinoline (qu) ligands and two Cl− anions. The Pt atom is located on an inversion centre and thus the asymmetric unit contains one half of the complex; the PtN2Cl2 unit is exactly planar. The dihedral angle between the PtN2Cl2 unit and the quinoline ligand is 85.1 (1)°. In the crystal, the complex mol­ecules are stacked into columns along the b axis. In the columns, several inter­molecular π–π inter­actions between the six-membered rings are present, the shortest ring centroid–centroid distance being 3.733 (5) Å between pyridine rings.
doi:10.1107/S1600536812013608
PMCID: PMC3344296  PMID: 22590062
16.  Bis(dipyridin-2-yl­amine-κ2 N 2,N 2′)palladium(II) dinitrate 
The asymmetric unit of the title compound, [Pd(C10H9N3)2](NO3)2, contains one half of a cationic PdII complex and one NO3 − anion. In the complex, the PdII ion is four-coordinated by four pyridine N atoms derived from the two chelating dipyridin-2-yl­amine (dpa) ligands. The PdII atom is located on an inversion centre, and thus the PdN4 unit is exactly planar. The dpa ligand itself is not planar, showing a dihedral angle between the pyridine rings of 39.9 (1)°. The anions are connected to the complex by inter­molecular N—H⋯O hydrogen bonds between the two O atoms of the anion and the N—H group of the cation. Weak inter­molecular C—H⋯O hydrogen bonds additionally link the constituents in the crystal structure. The NO3 − anion was found to be disordered over two sites with a site-occupancy factor of 0.55 (10) for the major component.
doi:10.1107/S1600536812012081
PMCID: PMC3343886  PMID: 22589854
17.  Bis(acetato-κO)(di-2-pyridyl­amine-κ2 N 2,N 2′)palladium(II) 
In the title complex, [Pd(CH3COO)2(C10H9N3)], the PdII ion is four-coordinated in a slightly distorted square-planar environment by two pyridine N atoms of the chelating di-2-pyridyl­amine (dpa) ligand and two O atoms from two anionic acetate ligands. The dpa ligand coordinates the PdII atom in a boat conformation of the resulting chelate ring; the dihedral angle between the pyridine rings is 39.3 (2)°. The two acetate anions coordinate the PdII atom as monodentate ligands and are located on the same sides of the PdN2O2 unit plane. The carboxyl­ate groups of the anionic ligands appear to be delocalized on the basis of the C—O bond lengths. Two complex mol­ecules are assembled through inter­molecular N—H⋯O hydrogen bonds, forming a dimer-type species. Inter­molecular C—H⋯O hydrogen bonds further stabilize the crystal structure.
doi:10.1107/S1600536812012093
PMCID: PMC3343887  PMID: 22589855
18.  Bis(di-2-pyridyl­amine-κ2 N 2,N 2’)platinum(II) dibromide monohydrate 
The asymmetric unit of the title compound, [Pt(C10H9N3)2]Br2·H2O, contains two crystallographically independent half-mol­ecules of the cationic PtII complex, two Br− anions and a lattice water mol­ecule; an inversion centre is located at the centroid of each complex. Each PtII ion is four-coordinated in an essentially square-planar environment by four pyridine N atoms derived from the two chelating di-2-pyridyl­amine (dpa) ligands, and the PtN4 unit is exactly planar. The chelate ring formed by the dpa ligand displays a boat conformation, with dihedral angles between the pyridine rings of 35.9 (2) and 41.0 (2)°. The complex cations, Br− anions and solvent water mol­ecules are linked by O—H⋯Br, N—H⋯Br, C—H⋯O and C—H⋯Br hydrogen bonds, forming a three-dimensional network.
doi:10.1107/S1600536812013062
PMCID: PMC3343900  PMID: 22589868
19.  Bis(azido-κN)(di-2-pyridyl­amine-κ2 N 2,N 2′)palladium(II) 
In the title complex, [Pd(N3)2(C10H9N3)], the PdII ion is in a slightly distorted square-planar coordination environment. The ligator atoms comprise the two pyridine N atoms of the chelating di-2-pyridyl­amine (dpa) ligand and two N atoms from two azide anions. The dpa ligand coordinates the Pd atom in a boat conformation, the dihedral angle between the pyridine rings being 24.4 (1)°. The pyridine rings are somewhat inclined to the least-squares plane of the PdN4 unit, making dihedral angles of 29.02 (9) and 26.47 (9)°. The azide ligands are slightly bent, with N—N—N angles of 173.0 (4) and 174.2 (4)°. In the crystal, mol­ecules are connected by N—H⋯N and C—H⋯N hydrogen bonds, forming chains along the c axis. When viewed down the b axis, successive chains are stacked in opposite directions. Intra­molecular C—H⋯N hydrogen bonds are also observed.
doi:10.1107/S1600536812013074
PMCID: PMC3343901  PMID: 22589869
20.  cis-Dichloridobis(quinoline-κN)­platinum(II) nitro­methane monosolvate 
In the title compound, [PtCl2(C9H7N)2]·CH3NO2, the PtII cation is four-coordinated in an essentially square-planar environment by two N atoms from two quinoline ligands and two Cl− anions. One of the nearly planar quinoline ligands [maximum deviations = 0.042 (6) and 0.018 (7) Å] is almost perpendicular to the PtCl2N2 unit [maximum deviation = 0.024 (3) Å], making a dihedral angle of 89.6 (1)°, whereas the other is slightly inclined to the central plane with a dihedral angle of 74.1 (1)°. The dihedral angle between the quinoline ligands is 88.3 (2)°. In the crystal, each solvent mol­ecule is linked to the metal complex by weak inter­molecular C—H⋯O hydrogen bonds.
doi:10.1107/S1600536812012469
PMCID: PMC3343880  PMID: 22589848
21.  4-Nitro-2-{[(tricyclo­[3.3.1.13,7]decan-1-yl)iminium­yl]meth­yl}phenolate 
The title compound, C17H20N2O3, is a Schiff base, which is found as a zwitterion in the solid state. The geometry around the iminium N atom indicates sp 2-hybridization. The zwitterion shows a strong intra­molecular N—H⋯O hydrogen-bond inter­action between the iminium N atom and the phenolate O atom.
doi:10.1107/S1600536812012597
PMCID: PMC3344155  PMID: 22606158
22.  (Di-2-pyridyl­amine-κ2 N 2,N 2′)diiodidoplatinum(II) 
The PtII ion in the title complex, [PtI2(C10H9N3)], is four-coordinated in a distorted square-planar environment defined by the two pyridine N atoms of the chelating di-2-pyridyl­amine (dpa) ligand and by two I− anions. The dpa ligand is not planar, the dihedral angle between the pyridine rings being 52.8 (3)°. Pairs of complex mol­ecules are assembled through inter­molecular N—H⋯I hydrogen bonds, forming a dimer-type species. The complexes are stacked in columns along the b axis and display several inter­molecular π–π inter­actions between the pyridine rings, with a shortest ring centroid–centroid distance of 3.997 (5) Å.
doi:10.1107/S1600536812011907
PMCID: PMC3343866  PMID: 22589840
23.  Tetra­kis(azido-κN)(di-2-pyridyl­amine-κ2 N 2,N 2′)platinum(IV) 
In the title complex, [Pt(N3)4(C10H9N3)], the PtIV ion is six-coordinated in a slightly distorted octa­hedral environment by the two pyridine N atoms of the chelating di-2-pyridyl­amine (dpa) ligand and four N atoms from four azide anions. The dpa ligand is not planar, the dihedral angle between the pyridine rings being 20.0 (3)°. The azide ligands are slightly bent [N—N—N = 173.5 (8)–175.1 (8)°]. In the crystal, the complex mol­ecules are connected by N—H⋯N hydrogen bonds, forming a chain along the b axis. An inter­molecular π–π inter­action between the chains is also present, the ring centroid–centroid distance being 3.713 (4) Å.
doi:10.1107/S1600536812011178
PMCID: PMC3343845  PMID: 22589819
24.  Dibromido(di-2-pyridyl­amine-κ2 N 2,N 2′)platinum(II) 
The PtII ion in the title complex, [PtBr2(C10H9N3)], is four-coordinated in an essentially square-planar environment by two N atoms from a chelating di-2-pyridyl­amine (dpa) ligand and two Br− anions. The dpa ligand is not planar, with the dihedral angle between the pyridine rings being 40.8 (2)°. The complex mol­ecules are stacked in columns along [001] through π–π inter­actions between the pyridine rings [centroid–centroid distances = 3.437 (3) and 3.520 (3) Å]. Inter­molecular N—H⋯Br hydrogen bonds connect the mol­ecules into chains running along [010]. Intra­molecular C—H⋯Br interactions are also observed.
doi:10.1107/S1600536812011300
PMCID: PMC3343850  PMID: 22589824
25.  (Acridine-κN)(pyridine-2,6-dicarboxyl­ato-κ3 O 2,N,O 6)palladium(II) 
In the title complex, [Pd(C7H3NO4)(C13H9N)], the PdII ion is four-coordinated in a distorted square-planar environment by one N and two O atoms from the tridentate pyridine-2,6-dicarboxyl­ate (dipic) anionic ligand and one N atom of the acridine (acr) ligand. The dipic and acr ligands are nearly planar [maximum deviation = 0.069 (3) Å in dipic and 0.091 (4) Å in acr] and the dihedral angle between their mean planes is 58.67 (7)°. The Pd—O bond lengths are nearly equal, but the Pd—N bond lengths are slightly different. There is a short C—H⋯O inter­action in the mol­ecule involving the two ligands. In the crystal, complex mol­ecules are linked through C—H⋯O inter­actions, forming a three-dimensional network. There are also a number of inter­molecular π–π inter­actions present, the shortest ring centroid–centroid distance being 3.622 (3) Å.
doi:10.1107/S1600536812011385
PMCID: PMC3343851  PMID: 22589825

Results 1-25 (109)