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1.  Crystal structure of (1E,1′E)-N,N′-(ethane-1,2-di­yl)bis­[(pyridin-2-yl)methanimine] 
The whole mol­ecule of the title compound, C14H14N4, is generated by twofold rotation symmetry. The twofold axis bis­ects the central –CH2-CH2– bond and the planes of the pyridine rings are inclined to one another by 65.60 (7)°. In the crystal, there are no significant inter­molecular inter­actions present.
PMCID: PMC4459302  PMID: 26090210
crystal structure; pyridine­carbaldehydes; 1,2-di­amino­pyridine; Schiff base; chelating ligands
2.  One Step Synthesis of NiO Nanoparticles via Solid-State Thermal Decomposition at Low-Temperature of Novel Aqua(2,9-dimethyl-1,10-phenanthroline)NiCl2 Complex 
[NiCl2(C14H12N2)(H2O)] complex has been synthesized from nickel chloride hexahydrate (NiCl2·6H2O) and 2,9-dimethyl-1,10-phenanthroline (dmphen) as N,N-bidentate ligand. The synthesized complex was characterized by elemental analysis, infrared (IR) spectroscopy, ultraviolet-visible (UV-vis) spectroscopy and differential thermal/thermogravimetric analysis (TG/DTA). The complex was further confirmed by single crystal X-ray diffraction (XRD) as triclinic with space group P-1. The desired complex, subjected to thermal decomposition at low temperature of 400 ºC in an open atmosphere, revealed a novel and facile synthesis of pure NiO nanoparticles with uniform spherical particle; the structure of the NiO nanoparticles product was elucidated on the basis of Fourier transform infrared (FT-IR), UV-vis spectroscopy, TG/DTA, XRD, scanning electron microscopy (SEM), energy-dispersive X-ray spectrometry (EDXS) and transmission electron microscopy (TEM).
PMCID: PMC3876087  PMID: 24351867
nickel(II) complex; thermal decomposition; 2,9-dimethyl-1,10-phenanthroline; nanoparticles
3.  N′-[(E)-2-Chloro­benzyl­idene]thio­phene-2-carbohydrazide 
There are two independent mol­ecules in the asymmetric unit of the title compound, C12H9ClN2OS, a Schiff base derived from hydrazide, in which the dihedral angles between the thio­phene and benzene rings are 3.6 (3) and 7.3 (3)°. In the crystal, the two independent mol­ecules are arranged about an approximate non-crystallographic inversion center and are connected by two N—H⋯O hydrogen bonds. Weak C—H⋯Cl contacts are also present. Conversely, there are neither significant aromatic stacking inter­actions nor contacts involving S atoms.
PMCID: PMC3884466  PMID: 24427070
4.  rac-(E,E)-N,N′-Bis(2-chloro­benzyl­idene)cyclo­hexane-1,2-di­amine 
In the title racemic Schiff base ligand, C20H20Cl2N2, which was prepared by the condensation of 2-chloro­benzaldehyde and cyclo­hexane-1,2-di­amine, the cyclo­hexane ring adopts a chair conformation and the dihedral angle between the aromatic rings of the 2-chloro­phenyl substituent groups is 62.52 (8)°. In the structure, there are two short intra­molecular methine C—H⋯Cl inter­actions [C⋯Cl = 3.066 (2) and 3.076 (3) Å], and in the crystal there are also weak inter­molecular aromatic C—H⋯Cl [3.464 (3), 3.553 (3) and 3.600 (3) Å] and Cl⋯Cl [3.557 (3) and 3.891 (3) Å] contacts.
PMCID: PMC3770357  PMID: 24046642
5.  2-Phen­oxy­ethyl benzoate 
In the title compound, C15H14O3, the dihedral angle between the benzene rings is 75.85 (7)°. In the crystal, centrosymmetrically related mol­ecules are weakly associated through pairs of inter­actions between a benzene ring and an O atom of the ester group [ring centroid⋯O = 3.952 (7) Å], and through pairs of inter­actions between the other benzene ring and an O atom of the phen­oxy group [ring centroid⋯O = 3.912 (7) Å], giving chains extending along [110].
PMCID: PMC3648312  PMID: 23723932
6.  2,2-Bis(pyridin-2-yl)-1,3-diazinane 
In the title compound, C14H16N4, the six-membered hexa­hydro­pyrimidine ring adopts a chair conformation. In the crystal, one of the two pyrimidine N atoms engages in N—H⋯N hydrogen bonding with one of the pyridine N atoms, generating a helical chain running along the c axis. The helical pitch is the length of the c axis.
PMCID: PMC3629617  PMID: 23634104
7.  Dichlorido(2,9-dimethyl-1,10-phenanthroline-κ2 N,N′)mercury(II) 
The title compound, [HgCl2(C14H12N2)], consists of one 2,9-dimethyl-1,10-phenanthroline (dmphen) ligand chelating the HgII ion and two chloride ligands coordinating to the HgII ion, forming a distorted tetra­hedral environment. The dmphen ligand is nearly planar (r.m.s. deviation = 0.0225 Å). The dihedral angle between the normal to the plane defined by the HgII atom and the two Cl atoms and the normal to the plane of the dmphen ring is 81.8 (1)°.
PMCID: PMC3569203  PMID: 23424405
8.  (2,9-Dimethyl-1,10-phenanthroline-κ2 N,N′)bis­(thio­cyanato-κS)mercury(II) 
The asymmetric unit of the title compound, [Hg(SCN)2(C14H12N2)], contains two complex mol­ecules in which the HgII atoms are both four-coordinated in a distorted tetra­hedral configuration by two N atoms from a chelating 2,9-dimethyl-1,10-phenanthroline ligand and by two S atoms from two thio­cyanate anions. The 1,10-phenanthroline ligand is slightly folded for one complex, the dihedral angle between the pyridine planes being 5.3 (1)°. In contrast it is nearly planar [0.5 (1)°] as it complexes with the other HgII atom. The thio­cyanate ligands are virtually linear and the S atom is bonded to HgII with N⋯S—Hg angles ranging from 99.3 (1) to 103.5 (1)°. Despite the presence of six aromatic rings in the asymmetric unit, there are no significant inter­molecular π–π contacts between phenanthroline ligands as the centroid–centroid distance of the closest contact between six-membered rings is 4.11 (1) A°.
PMCID: PMC3470145  PMID: 23125589
9.  [1,2-Bis(diphenyl­phosphan­yl)ethane-κ2 P,P′]dichloridopalladium(II) dimethyl sulfoxide monosolvate 
In the title compound, [PdCl2(C26H24P2)]·C2H6OS, the PdII atom adopts a distorted cis-PdCl2P2 square-planar coordination geometry. The five-membered chelate ring adopts an envelope conformation with a methyl­ene C atom in the flap position. The S and C atoms of the dimethyl sulfoxide (DMSO) solvent mol­ecule are disordered over two sets of sites in a 0.8976 (18):0.1024 (18) ratio. The DMSO O atom accepts three C—H⋯O hydrogen bonds from an adjacent complex mol­ecule.
PMCID: PMC3393233  PMID: 22807801
10.  5,5-Dimethyl-2,2-bis­(pyridin-2-yl)-1,3-diazinane 
In the mol­ecule of the title compound, C16H20N4, the 1,3-diazinane ring adopts a chair conformation and the dihedral angle formed by the pyridine rings is 78.64 (8)°. The mol­ecular conformation is stabilized by an intra­molecular C—H⋯N hydrogen bond, forming an S(6) ring motif. In the crystal, centrosymmetrically related mol­ecules are linked into dimers by pairs of N—H⋯N hydrogen bonds, generating rings of R 2 2(10) graph-set motif.
PMCID: PMC3379365  PMID: 22719563
11.  cis-[1,4-Bis(diphenyl­phosphan­yl)butane-κ2 P,P′]dichlorido(cyclo­hexane-1,2-diamine-κ2 N,N′)ruthenium(II) dichloro­methane monosolvate 
In the title compound, [RuCl2(C6H14N2)(C28H28P2)]·CH2Cl2, the RuII ion is coordinated in a slightly distorted octa­hedral environment, formed by two cis-oriented chloride ligands, two cis P atoms of a 1,4-bis­(diphenyl­phosphan­yl)butane ligand and two cis-chelating N atoms of a bidentate cyclo­hexane-1,2-diamine ligand. In the crystal, pairs of mol­ecules form inversion dimers via N—H⋯Cl hydrogen bonds. In addition, intra­molecular N—H⋯Cl and weak C—H⋯Cl, C—H⋯N, N—H⋯π and C—H⋯π hydrogen bonds are observed. One of the Cl atoms of the solvent mol­ecule is disordered over two sites with refined occupancies of 0.62 (1) and 0.38 (1).
PMCID: PMC3344316  PMID: 22590082
12.  Synthesis and Characterization of Hybrid Materials Consisting of n-octadecyltriethoxysilane by Using n-Hexadecylamine as Surfactant and Q0 and T0 Cross-Linkers 
Novel hybrid xerogel materials were synthesized by a sol-gel procedure. n-octadecyltriethoxysilane was co-condensed with and without different cross-linkers using Q0 and T0 mono-functionalized organosilanes in the presence of n-hexadecylamine with different hydroxyl silica functional groups at the surface. These polymer networks have shown new properties, for example, a high degree of cross-linking and hydrolysis. Two different synthesis steps were carried out: simple self-assembly followed by sol-gel transition and precipitation of homogenous sols. Due to the lack of solubility of these materials, the compositions of the new materials were determined by infrared spectroscopy, 13C and 29Si CP/MAS NMR spectroscopy and scanning electron microscopy.
PMCID: PMC3382804  PMID: 22754364
sol-gel; solid state NMR; cross-linkers; stationary phases
13.  Dibromido(2,9-dimethyl-1,10-phenanthroline-κ2 N,N′)cadmium 
In the title complex, [CdBr2(C14H12N2)], the CdII ion is tetra­coordinated by two N atoms of the bidentate 2,9-dimethyl-1,10-phenanthroline ligand and two bromide ions in a substanti­ally distorted CdN2Br2 tetra­hedral geometry. In the crystal, inversion dimers linked by pairs of weak C—H⋯Br bonds generate R 2 2(14) loops. Aromatic π–π stacking [shortest centroid–centroid separation = 3.633 (2) Å] inter­actions occur within, and also link, the dimers into chains propagating parallel to [100].
PMCID: PMC3238742  PMID: 22199619
14.  (2,9-Dimethyl-1,10-phenanthroline-κ2 N,N′)diiodidocadmium 
In the title compound, [CdI2(C14H12N2)], the mol­ecule sits on a crystallographic twofold axis. The coordination sphere of the CdII atom is built of two symmetry-equivalent N atoms of one 2,9-dimethyl-1,10-phenanthroline (dmphen) ligand and two symmetry-equivalent I atoms, thus forming a distorted tetra­hedral geometry. Inversion-related mol­ecules inter­act along the c-axis direction by π–π stacking inter­actions between the phenanthroline ring systems, with centroid–centroid distances of 3.707 (9) and 3.597 (10) Å.
PMCID: PMC3238587  PMID: 22199478
15.  trans-Dichlorido(2,2-dimethyl­propane-1,3-diamine)­bis­(triphenyl­phosphane)ruthenium(II) 
In the title compound, [RuCl2(C5H14N2)(C18H15P)2], the RuII atom is six-coordinated, forming a slightly distorted octa­hedral geometry, with two chloride ions in an axial arrangement, and two P atoms of two triphenyl­phosphane and two chelating N atoms of the bidentate 2,2-dimethyl­propane-1,3-diamine ligand located in the equatorial plane. The average Ru—P, Ru—N and Ru—Cl bond lengths are 2.325 (18), 2.1845 (7) and 2.4123 (12) Å, respectively.
PMCID: PMC3006909  PMID: 21587674
16.  N′-(Di-2-pyridylmethyl­ene)benzo­hydrazide 
In the title Schiff base, C18H14N4O, the amido –NH– unit is connected to one of the two pyridyl N atoms at an N(—H)⋯N distance of 2.624 (2) Å. The mol­ecular packing features an inter­molecular C—H⋯N R 2 2(6) hydrogen-bonding ring motif.
PMCID: PMC2969230  PMID: 21582871

Results 1-16 (16)