Nitrogen atom vs. oxygen atom linkage and .sigma. vs. .pi. bonding in transition-metal complexes of dinitrogen oxide and cyanate

1985 ◽  
Vol 24 (6) ◽  
pp. 871-876 ◽  
Author(s):  
Debbie Fu Tai Tuan ◽  
Roald Hoffmann
Keyword(s):  
Nitrogen Atom ◽  
Transition Metal ◽  
Oxygen Atom ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Dinitrogen Oxide

Synthesis, structural studies, kinetic stability, and oxidation catalysis of the late first row transition metal complexes of 4,10-dimethyl-1,4,7,10-tetraazabicyclo[6.5.2]pentadecane

2015 ◽  
Vol 44 (27) ◽  
pp. 12210-12224 ◽  
Author(s):  
Dallas L. Matz ◽  
Donald G. Jones ◽  
Kimberly D. Roewe ◽  
Michael-Joseph Gorbet ◽  
Zhan Zhang ◽  
...  
Keyword(s):  
Transition Metal ◽  
Oxygen Atom ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Hydrogen Abstraction ◽  
Kinetic Stability ◽  
Oxidation Catalysis ◽  
Atom Transfer ◽  
Structural Studies ◽  
Oxygen Atom Transfer

Fe/Mn complexes of ethylene cross-bridged homocyclen catalyze oxygen atom transfer and hydrogen abstraction.

Synthesis and characterization of binuclear transition metal complexes incorporating the tridentate chelating ligand dimethyl (N,N-dimethylethanolamino)(1-pyrazolyl)gallate: crystal and molecular structure of bis-μ-pyrazolyl-(N(1),N(2))-bis[dimethyl(N,N-dimethylethanolamino)-(1-pyrazolyl)gallato(N(2),O,N)copper(II)]

1977 ◽  
Vol 55 (24) ◽  
pp. 4166-4173 ◽  
Author(s):  
Kenneth S. Chong ◽  
Steven J. Rettig ◽  
Alan Storr ◽  
James Trotter
Keyword(s):  
Nitrogen Atom ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Amino Nitrogen ◽  
Direct Methods ◽  
Chelating Ligand ◽  
Binuclear Molecule ◽  
Copper Centre

Details of the synthesis of the tridentate tris chelating ligand dimethyl(N,N-dimethylethanolamino)(1-pyrazolyl)gallate and the preparation and physical properties of the binuclear transition metal complexes incorporating this ligand are given. Crystals of bis-μ-pyrazolyl(N(1),N(2))-bis[dimethyl(N,N-dimethylethanolamino)(1-pyrazolyl)gallato(N(2),O,N)copper(II)] are monoclinic, a = 12.018(2), b = 10.390(1), c = 13.568(3) Å, β = 100.04(6)°, Z = 2, space group P21/c. The structure was solved by direct methods and was refined by full-matrix least squares procedures to a final R of 0.045 and Rw of 0.058 for 2460 reflections with I ≥ 3σ(I). The centrosymmetric binuclear molecule features copper atoms having distorted square pyramidal co-ordination geometry. Three of the basal positions are occupied by the oxygen, pyrazolyl nitrogen, and amino nitrogen atoms of the tridentate tris-chelating ligand. The two remaining sites are occupied by bridging pyrazolyl groups, which provide a basal nitrogen atom to one copper atom and an apical nitrogen atom to the second copper centre. The gallium atoms have distorted tetrahedral coordination geometry. Important bond lengths (corrected for libration) are: Cu—O, 1.981(3), Cu—N(basal), 1.953(3)–2.143(4), Cu—N(apical), 2.173(3), Ga—O, 1.907(3), Ga—N, 1.991(4), and Ga—C, 1.962(7) and 1.977(7) Å.

Mechanochemical changes on cyclometalated Ir(iii) acyclic carbene complexes – design and tuning of luminescent mechanochromic transition metal complexes

2020 ◽  
Vol 7 (3) ◽  
pp. 786-794 ◽  
Author(s):  
Jingqi Han ◽  
Kin-Man Tang ◽  
Shun-Cheung Cheng ◽  
Chi-On Ng ◽  
Yuen-Kiu Chun ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Carbene Complexes ◽  
New Class

A new class of luminescent cyclometalated Ir(iii) complexes with readily tunable mechanochromic properties derived from the mechanically induced trans-to-cis isomerization have been developed.

Density Functional Calculations of EPR Parameter g Tensors of Some Transition Metal Complexes

2011 ◽  
Vol 2 (2) ◽  
pp. 139-141
Author(s):  
Vinita Prajapati ◽  
◽  
P.L.Verma P.L.Verma ◽  
Dhirendra Prajapati ◽  
B.K.Gupta B.K.Gupta
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Density Functional Calculations ◽  
Density Functional

Synthesis, Characterization and in vitro Biological Evaluation of a New Schiff Base Derived from Drug and its Complexes with Transition Metal Ions

2018 ◽  
Vol 69 (7) ◽  
pp. 1678-1681
Author(s):  
Amina Mumtaz ◽  
Tariq Mahmud ◽  
M. R. J. Elsegood ◽  
G. W. Weaver
Keyword(s):  
Schiff Base ◽  
Transition Metal ◽  
Metal Ions ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Free Ligand ◽  
Transition Metal Ions ◽  
Biological Evaluation ◽  
Pyridoxal Hydrochloride

New series of copper (II), cobalt (II), zinc (II), nickel (II), manganese (II), iron (II) complexes of a novel Schiff base were prepared by the condensation of sulphadizine and pyridoxal hydrochloride. The ligand and metal complexes were characterized by utilizing different instrumental procedures like microanalysis, thermogravimetric examination and spectroscopy. The integrated ligand and transition metal complexes were screened against various bacteria and fungus. The studies demonstrated the enhanced activity of metal complexes against reported microbes when compared with free ligand.

Sign in / Sign up

Export Citation Format

Share Document