ChemInform Abstract: MIXED-LIGAND IRON(III) DITHIOCARBAMATES. CALCULATION OF LIGAND FIELD PARAMETERS IN ELECTRON SPIN CROSSOVER D5 SYSTEMS BY COMBINATION OF SPECTRAL AND MAGNETIC DATA

1977 ◽  
Vol 8 (42) ◽  
pp. no-no
Author(s):  
C. A. TSIPIS ◽  
C. C. HADJIKOSTAS ◽  
G. E. MANOUSSAKIS
Keyword(s):  
Electron Spin ◽  
Spin Crossover ◽  
Mixed Ligand ◽  
Magnetic Data ◽  
Ligand Field ◽  
Ligand Field Parameters

scholarly journals Some Novel Manganese(III) Mixed Ligand Complexes and its Decolourization Studies

2018 ◽  
Vol 34 (6) ◽  
pp. 2867-2871
Author(s):  
Deepika Jaiswal ◽  
Sudha Yadava
Keyword(s):  
Mass Spectrometry ◽  
Mixed Ligand ◽  
Mixed Ligand Complexes ◽  
Distorted Octahedral Geometry ◽  
Ligand Field ◽  
Distorted Octahedral ◽  
Ft Ir ◽  
Ethylenediamine Ligand ◽  
Red Dye ◽  
Ligand Field Parameters

Some novel mixed ligand complexes of Mn(III) with glycine ligand namely [Mn(gly)2 Cl(en)], [Mn(gly)2 Br(en)], [Mn(gly)2 N3 (en)] and [Mn(gly)2 NCS(en)] have been synthesized starting from Mn(gly)2 Cl, Mn(gly)2 Br, Mn(gly)2N3 and Mn(gly)2 NCS respectively. These newly synthesized complexes have been characterized by UV/Vis, FT-IR and Mass spectrometry. The spectroscopic data suggest distorted octahedral geometry for all these mixed ligand complexes. The λmax values of these complexes for 5T2g → 5Eg transitions are 482 nm for [Mn(gly)2N3(en)], 488 for [Mn(gly)2NCS(en)], 486 for [Mn(gly)2 Br(en)] and 484 for [Mn(gly)2Cl(en)], all these transitions are red shifted in comparison to their parent complexes. The ligand field parameters such as 10 Dq, B and β have also been calculated and suggest covalent metal ligand bonding. One peculiar finding is that the FT-IR spectra shows frequencies for both free and coordinated NH2 group in all complexes indicating that the ethylenediamine ligand present here is non bridging in nature. The mass spectrometry results show molecular ion peaks at m/z 300, 345, 307 and 323 for [Mn(gly)2Cl(en)], [Mn(gly)2Br(en)], [Mn(gly)2N3(en)] and [Mn(gly)2NCS(en)] respectively. The coordination of ethylenediamine to Mn(III) enhances its efficiency towards decolourization methyl red dye.

Antibiotics as ligands. The coordinating ability of deprotonated cycloserine towards transition metals

1983 ◽  
Vol 36 (6) ◽  
pp. 1125 ◽  
Author(s):  
F Forghieri ◽  
C Preti ◽  
G Tosi ◽  
P Zannini
Keyword(s):  
Transition Metals ◽  
Metal Ions ◽  
Thermal Analyses ◽  
Bidentate Ligand ◽  
Magnetic Data ◽  
Ligand Field ◽  
Ligand Field Parameters

We report the complexes of the deprotonated cycloserine (ccs) ligand, 4-aminoisoxazolidin-3-one, with the metal ions chromium(III), manganese(II), iron(II), iron(III), cobalt(II), nicke1(II), zinc(II), zirconium(IV), palladium(II), silver(I), cadmium(II), osmium(III), platinum(II) and mercury(II). The tentative structures of the complexes have been assigned on the basis of analytical, spectral(u.v.- visible, i.r. and far i.r.) and magnetic data, and of thermal analyses (t.g. and d.t.g.). These complexes appear to contain ccs as an uninegative bidentate ligand forming five-membered rings in which the O- and the NH2 groups bind to the metals. The ligand field parameters have been evaluated and are in keeping with the proposed structures; they confirm the presence of oxygen-and nitrogen-containing chromophores.

Cycloserine derivatives as ligands. The coordinating ability of 4,4'-[1,4-Phenylenebis(methylidynenitrilo)]bis(isoxazolidin-3-one) towards chromium(III), ruthenium(III) and rhodium(III) halides

1982 ◽  
Vol 35 (9) ◽  
pp. 1829 ◽  
Author(s):  
C Preti ◽  
L Tassi ◽  
G Tosi ◽  
P Zannini ◽  
AF Zanoli
Keyword(s):  
Ring Opening ◽  
Thermal Analyses ◽  
Far Infrared ◽  
Infrared Region ◽  
Magnetic Data ◽  
Ligand Field ◽  
Imino Group ◽  
Experimental Conditions ◽  
Coordinated Water ◽  
Ligand Field Parameters

The complexes of the cycloserine derivative, 4,4'-[1,4-phenylenebis(methylidynenitrilo)]bis(isoxazolidin-3-one) or terizidone, with chromium(III), ruthenium(III) and rhodium(III) have been synthetized; their structures have been suggested on the basis of analytical, conductivity, spectral (visible, infrared and far-infrared) and magnetic data, and the thermal analyses have revealed the extent of coordinated water among the chromium and ruthenium complexes. The various ligand field parameters have been evaluated; the B' values suggest a strong covalency in the metal-ligand σ bond and the Dq values show a medium-strong ligand field. The position and multiplicity of the metal-halogen stretching modes in the far-infrared region have been extensively investigated and discussed; the results are particularly useful in distinguishing between the mer- and fac-isomers in the octahedral compounds of the ML3X3 type. The ligand is monodentate O-bonded or N-bonded through the oxygen of the keto group or through the nitrogen of the imino group of the isoxazole ring. We have never observed a metal-induced cycloserine ring opening under the present experimental conditions.

The Coordination Chemistry of Phosphoryl Compounds Containing the — N(CH3)2 Group, Part VIII

1972 ◽  
Vol 27 (7) ◽  
pp. 759-763 ◽  
Author(s):  
M. W. G. De Bolster ◽  
W. L. Groeneveld
Keyword(s):  
Coordination Chemistry ◽  
General Formula ◽  
Ligand Field ◽  
Chemical Analyses ◽  
X Ray ◽  
Physical Measurements ◽  
Ligand Field Spectra ◽  
Chloride Adduct ◽  
Ligand Field Parameters ◽  
Group Part

A number of new solvates and adducts containing bisphenyldimethylaminophosphine oxide is reported. The solvates have the general formula M[(C6H5)2P(O)N(CH3)2]42+(anion-)2, in which M = Mg, Ca, Mn, Fe, Co, Ni, Cu, Zn and Cd, and the anions are ClO4- and BF4-. The adducts have the general formula M[(C6H5)2P(O)N(CH3)2]2Cl2, where M stands for the same series of metals.The compounds are characterized and identified by chemical analyses and physical measurements.Ligand-field and vibrational spectra have been investigated; values for the ligand-field parameters are reported. It is concluded that coordination takes place via the oxygen atom of the ligand.X-ray powder patterns were used in combination with ligand-field spectra to deduce the coordination around the metal ions.The interesting behaviour of the nickel (II) chloride adduct upon heating is discussed and it is shown that both a square pyramidal and a tetrahedral modification exists.

Ligand Field Parameters

1976 ◽  
Vol 15 (3-4) ◽  
pp. 189-199 ◽  
Author(s):  
Ivano Bertini ◽  
Dante Gatteschi ◽  
Andrea Scozzafava
Keyword(s):  
Ligand Field ◽  
Ligand Field Parameters

scholarly journals Hexagonal-Shaped Spin Crossover Nanoparticles Studied by Ising-Like Model Solved by Local Mean Field Approximation

2021 ◽  
Vol 7 (5) ◽  
pp. 69
Author(s):  
Catherine Cazelles ◽  
Jorge Linares ◽  
Mamadou Ndiaye ◽  
Pierre-Richard Dahoo ◽  
Kamel Boukheddaden
Keyword(s):  
Spin Crossover ◽  
Hexagonal Lattice ◽  
Mean Field ◽  
Field Approximation ◽  
Mean Field Approximation ◽  
Ligand Field ◽  
Order And Disorder ◽  
The Matrix ◽  
Local Mean ◽  
Parameter Values

The properties of spin crossover (SCO) nanoparticles were studied for five 2D hexagonal lattice structures of increasing sizes embedded in a matrix, thus affecting the thermal properties of the SCO region. These effects were modeled using the Ising-like model in the framework of local mean field approximation (LMFA). The systematic combined effect of the different types of couplings, consisting of (i) bulk short- and long-range interactions and (ii) edge and corner interactions at the surface mediated by the matrix environment, were investigated by using parameter values typical of SCO complexes. Gradual two and three hysteretic transition curves from the LS to HS states were obtained. The results were interpreted in terms of the competition between the structure-dependent order and disorder temperatures (TO.D.) of internal coupling origin and the ligand field-dependent equilibrium temperatures (Teq) of external origin.

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