P-Dimethylaminobenzaldehyde semicarbazone: The bonding abilities of imine nitrogen atom

2009 ◽  
Vol 917 (2-3) ◽  
pp. 125-132 ◽  
Author(s):  
Agata Trzesowska
Keyword(s):  
Nitrogen Atom ◽  
Imine Nitrogen ◽  
Imine Nitrogen Atom

Synthesis and Properties of 2-(Dimesitylboryl)benzylideneamines

2009 ◽  
Vol 64 (11-12) ◽  
pp. 1381-1386 ◽  
Author(s):  
Zureima García-Hernández ◽  
François P. Gabbaï
Keyword(s):  
Excited State ◽  
Nitrogen Atom ◽  
Intramolecular Charge Transfer ◽  
Quantum Yields ◽  
Structural Studies ◽  
Green Fluorescence ◽  
Imine Nitrogen ◽  
Td Dft ◽  
Imine Nitrogen Atom ◽  
Boron Center

Lithiation of 2-(2-bromophenyl)-dioxolane (1) followed by reaction with dimesitylboron fluoride afforded 2-(2-dimesitylborylphenyl)-dioxolane (2) which was deprotected to afford 2- dimesitylboryl-benzaldehyde (3). Compound 3 reacts with aliphatic amines such as n-butylamine and ethanolamine to afford the corresponding imines 2-(dimesitylboryl)benzylidenebutylamine (4) and 2-(dimesitylboryl)benzylideneethanolamine (5), respectively. Structural studies indicate coordination of the imine-nitrogen atom to the boron center. Imines 4 and 5 emit a green fluorescence near 510 nm with quantum yields approaching 10%. TD-DFT calculations suggest that this emission arises from an intramolecular charge-transfer excited state

scholarly journals {1-[1-(2-Hydroxyphenyl)ethylidene]-2-(pyridin-2-yl-κN)hydrazine-κ2 N′,O}{1-[1-(2-oxidophenyl)ethylidene]-2-(pyridin-2-yl-κN)hydrazine-κ2 N′,O}nickelate(II) nitrate hemihydrate

2018 ◽  
Vol 74 (5) ◽  
pp. 642-645 ◽  
Author(s):  
Sarr Mamour ◽  
Diop Mayoro ◽  
Thiam Elhadj Ibrahima ◽  
Gaye Mohamed ◽  
Barry Aliou Hamady ◽  
...  
Keyword(s):  
Nitrogen Atom ◽  
Hydrogen Bonds ◽  
Oxygen Atom ◽  
Carbonyl Compounds ◽  
Three Dimensional ◽  
Optical Isomers ◽  
Imine Nitrogen ◽  
Phenolic Oxygen ◽  
Imine Nitrogen Atom ◽  
Nitrate Anions

The 2-hydrazinopyridine precursor has been widely used to prepare ligands of various kinds by condensation with carbonyl compounds. These types of ligands are suitable for synthesizing novel transition metal (II) complexes with interesting magnetic properties. In this context we have synthesized the ligand 1-(2-hydroxyphenyl-2-ethylidene)-2-(pyridin-2-yl)hydrazine (HL) which was used in the preparation of the mononuclear title complex, [Ni(C13H12N3O)(C13H13N3O)]NO3·0.5H2O. As a result of the presence of HL and L in the [{Ni(HL)(L)}]+ unit, the complex appears to be a supramolecular dimer composed of the Δ(−) and Λ(−) optical isomers, which are linked by strong hydrogen-bonds. As well as the dimer generated by two mononuclear [{Ni(HL)(L)}]+ cations, the asymmetric unit also contains two nitrate anions and one water molecule. Each Ni atom is coordinated to two ligand molecules by a nitrogen atom of the pyridine ring, an imine nitrogen atom and a phenolic oxygen atom of one of the ligand molecules and a phenolate oxygen atom of the other organic molecules. The environment around the cation is a distorted octahedron. The basal planes are defined by the two nitrogen atoms of the pyridine rings and the two phenolic oxygen atoms of the ligand, the apical positions being occupied by the azomethine atoms. The O atoms of one of the nitrate ions are disordered over two sets of sites in a 0.745 (9):0.255 (9) ratio. In the crystal, the dimers are linked by numerous hydrogen bonds, forming a three-dimensional framework.

scholarly journals Formation of a macrocycle from dichlorodimethylsilane and a pyridoxalimine Schiff base ligand

2021 ◽  
Vol 77 (11) ◽  
Author(s):  
Uwe Böhme ◽  
Anke Schwarzer ◽  
Betty Günther
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bond ◽  
Schiff Base ◽  
Nitrogen Atom ◽  
Oxygen Atom ◽  
Schiff Base Ligand ◽  
Silicon Compound ◽  
Asymmetric Unit ◽  
Imine Nitrogen ◽  
Imine Nitrogen Atom

The reaction of dichlorodimethylsilane with a polydentate Schiff base ligand derived from pyridoxal and 2-ethanolamine yielded the macrocyclic silicon compound (8E,22E)-4,4,12,18,18,26-hexamethyl-3,5,17,19-tetraoxa-8,13,22,27-tetraaza-4,18-disilatricyclo[22.4.0.010,15]octacosa-1(24),8,10,12,14,22,25,27-octaene-11,25-diol, C24H36N4O6Si2. The asymmetric unit contains the half macrocycle with an intramolecular O—H...N hydrogen bond between the imine nitrogen atom and a neighbouring oxygen atom. The crystal structure is dominated by C—H...O and C—H...π interactions, which form a high ordered molecular network.

Electronic versus steric control in palladium complexes of carboranyl phosphine-iminophosphorane ligands

2019 ◽  
Vol 48 (2) ◽  
pp. 486-503
Author(s):  
José Luis Rodríguez-Rey ◽  
David Esteban-Gómez ◽  
Carlos Platas-Iglesias ◽  
Antonio Sousa-Pedrares
Keyword(s):  
Nitrogen Atom ◽  
Electronic Properties ◽  
Palladium Complexes ◽  
Imine Nitrogen ◽  
Imine Nitrogen Atom ◽  
Fine Control ◽  
Donor Ability ◽  
Pd Complexes ◽  
Steric Control

Subtle changes in the electronic properties of C- and B3-carboranyl phosphineiminophosphoranes allows a fine control of the donor ability of the imine nitrogen atom, which results in Pd complexes with the ligands providing (P,N)-chelating or P-terminal coordination.

scholarly journals The Preparation and Structure of [(2,4-Dimethyl-8-ethyl-5,8-diazadec-4-ene-2-amine)chlorocopper(II)] Perchlorate

2013 ◽  
Vol 2013 ◽  
pp. 1-4
Author(s):  
Neil F. Curtis ◽  
Jan Wikaira
Keyword(s):  
Nitrogen Atom ◽  
Chloride Ion ◽  
Imine Nitrogen ◽  
Square Planar ◽  
Imine Nitrogen Atom

Copper(II) chloride and perchlorate, N,N-diethylethane-1,2-diamine, react in (m)ethanol with acetone and ammonia to form [(2,4-dimethyl-8-ethyl-5,8-diazadec-4-ene-2-amine)chlorocopper(II)] perchlorate, C12H27Cl2CuN3O4, , monoclinic, C2/c, (Hall-C2/c); a, 26.418(1), b, 9.7385(4); c, 14.0993(5) Å; β, 91.134(3)°. This has copper(II) in tetrahedrally distorted square-planar coordination by one primary, one tertiary, and one imine nitrogen atom and the chloride ion.

Structural Study of a Binuclear Zinc Complex of 2,6-Diacetylpyridine Bis{N(4)-dimethylthiosemicarbazone}, [Zn(2,6Ac4DM)]2 · MeCN

2001 ◽  
Vol 56 (3) ◽  
pp. 229-232 ◽  
Author(s):  
Elena Labisbal ◽  
Alfonso Castiñeiras ◽  
Christine A. Brown ◽  
Douglas X. West
Keyword(s):  
Nitrogen Atom ◽  
Sulfur Atom ◽  
Electrochemical Synthesis ◽  
Zinc Complex ◽  
The Other ◽  
Acetonitrile Solution ◽  
Monoclinic Space Group ◽  
Pyridyl Nitrogen ◽  
Imine Nitrogen ◽  
Imine Nitrogen Atom

Abstract Zinc, 2,6-Diacetylpyridine Bis{N(4)-dimethylthiosemicarbazone}, Electrochemical Synthesis Zinc metal was oxidized in the presence of 2,6-diacetylpyridine bis{N(4)-dimethylthiosemi-carbazone} (2 ,6H2Ac4DM) in an acetonitrile solution, to produce a complex of the formula [Zn(2 ,6Ac4DM)]2-CH3CN. One of the zinc atoms is distorted octahedrally 6-coordinate and the coordination involves both pyridyl nitrogen atoms of the two ligands, the imine nitrogen atom and the thiolato sulfur atom of one thiosemicarbazone moiety of each ligand. The other zinc center is distorted tetrahedrally 4-coordinate with NS coordination of the two remaining thiosemicarbazone moieties. The complex crystallizes in the monoclinic space group C2/c with a = 14.952(2), b = 17.656(3), c = 15.553(4) Å, ß = 111.456(16)°, V= 3821.5(13) Å3 and Z = 4.

scholarly journals Complexes of Pd(II) and Pt(II) with 9-Aminoacridine: Reactions with DNA and Study of Their Antiproliferative Activity

2007 ◽  
Vol 2007 ◽  
pp. 1-15 ◽  
Author(s):  
X. Riera ◽  
V. Moreno ◽  
C. J. Ciudad ◽  
V. Noe ◽  
M. Font-Bardía ◽  
...  
Keyword(s):  
Antiproliferative Activity ◽  
Palladium Complex ◽  
Human Tumor ◽  
Direct Reaction ◽  
X Ray Diffraction ◽  
Base Pairs ◽  
Tertiary Structures ◽  
Imine Nitrogen ◽  
Pbr322 Dna ◽  
Imine Nitrogen Atom

Four new metal complexes {M = Pd(II) or Pt(II)} containing the ligand 9-aminoacridine (9AA) were prepared. The compounds were characterized by FT-IR andH,C, andPtNMR spectroscopies. Crystal structure of the palladium complex of formulae[Pd(9AA)(μ-Cl)]2·2DMF was determined by X-ray diffraction. Two 9-acridine molecules in the imine form bind symmetrically to the metal ions in a bidentate fashion through the imine nitrogen atom and the C(1) atom of the aminoacridine closing a new five-membered ring. By reaction with phosphine or pyridine, the Cl bridges broke and compounds with general formulae [Pd(9AA)Cl(L)] (whereL=PPh3or py) were formed. A mononuclear complex of platinum of formulae [Pt(9AA)Cl(DMSO)] was also obtained by direct reaction of 9-aminoacridine and the complex [PtCl2(DMSO)2]. The capacity of the compounds to modify the secondary and tertiary structures of DNA was evaluated by means of circular dichroism and electrophoretic mobility. Both palladium and platinum compounds proved active in the modification of both the secondary and tertiary DNA structures. AFM images showed noticeable modifications of the morphology of the plasmid pBR322 DNA by the compounds probably due to the intercalation of the complexes between base pairs of the DNA molecule. Finally, the palladium complex was tested for antiproliferative activity against three different human tumor cell lines. The results suggest that the palladium complex of formula[Pd(9AA)(μ-Cl)]2has significant antiproliferative activity, although it is less active than cisplatin.

scholarly journals Synthesis and crystal structures of a poliaza receptor macrigiland: 1,3-BTS(2-Nitrobenzyldenamino)Propan-2-0L

Quimica Hoy ◽  
2010 ◽  
Vol 1 (1) ◽  
pp. 4
Author(s):  
Perla Elizondo Martinez ◽  
Nancy Perez Rodriguez ◽  
Cecilia Rodriguez de Barbarin ◽  
Susana López Cortina ◽  
Sara Rodríguez de Luna
Keyword(s):  
Weak Interactions ◽  
Bond Formation ◽  
Asymmetric Unit ◽  
X Ray Diffraction ◽  
Related Molecule ◽  
X Ray ◽  
Imine Nitrogen ◽  
Benzene Rings ◽  
Imine Nitrogen Atom ◽  
Absolute Structure

The asymmetric unit of the title compound C11H16N,05 , contains one molecule of the compound (L3) (1,3-bis(2-nitrobenzylideneamino )propan-2-ol). The molecule shows a chiral C atom but the absolute structure was not possible to be determined by X-ray diffraction. The molecule shows intermolecular hydrogen bonding involving the hydroxy group and an imine nitrogen atom of a symmetry related molecule. The molecular distribution shows weak interactions between oxygen atoms of the nitro groups and two different C-H groups of benzene rings. The extended weak H bond formation, using the N02 groups, probably gives a more stable crystal structure. The molecule represents a precursor of a polyaza macrocylic ligands.

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