Mixing of states and the determination of ligand field parameters for high-spin octahedral complexes of nickel(II). Electronic spectrum and structure of bis(1,7-diaza-4-thiaheptane)nickel(II) perchlorate

1983 ◽  
Vol 22 (6) ◽  
pp. 982-986 ◽  
Author(s):  
Susan M. Hart ◽  
Jan C. A. Boeyens ◽  
Robert D. Hancock
Keyword(s):  
Electronic Spectrum ◽  
High Spin ◽  
Ligand Field ◽  
Ligand Field Parameters

Determination of Ligand-Field Parameters and f-Electronic Structures of Double-Decker Bis(phthalocyaninato)lanthanide Complexes

2003 ◽  
Vol 42 (7) ◽  
pp. 2440-2446 ◽  
Author(s):  
Naoto Ishikawa ◽  
Miki Sugita ◽  
Tomoko Okubo ◽  
Naohiro Tanaka ◽  
Tomochika Iino ◽  
...  
Keyword(s):  
Electronic Structures ◽  
Lanthanide Complexes ◽  
Ligand Field ◽  
Double Decker ◽  
Ligand Field Parameters

Complexes of Dimethylaminophosphazenes with Metal Ions

1975 ◽  
Vol 53 (12) ◽  
pp. 1765-1774 ◽  
Author(s):  
H. P. Calhoun ◽  
N. L. Paddock ◽  
J. N. Wingfield
Keyword(s):  
Metal Ions ◽  
High Spin ◽  
Electronic Spectra ◽  
Molecular Structures ◽  
Metal Coordination ◽  
Ligand Field ◽  
Steric Interactions ◽  
Trigonal Bipyramidal ◽  
Ligand Field Parameters ◽  
Distorted Trigonal Bipyramidal

The preparation of complexes DDPN.2MCl2 (M = Mn, Fe, Co, Zn ), DDPN.M(NO3)2, (M = Mn, Co, Ni, Cu, Zn), (DDPN = N6P6(NMe2)12) ), and N9P9(NMe2)18.2CoCl2 is described. All the complexes of the hexamer are of the high spin type and contain the cations DDPNMX+ (X = Cl, NO3 ). Their infrared and electronic spectra show that their molecular structures are essentially the same as those established crystallographically for the chlorocations (M = Co, Cu ), in which, as a consequence of steric interactions, the metal has a distorted trigonal-bipyramidal environment. The complex with Cu(NO3)2 is exceptional in that the DDPNCu2+ ion is formed in ionizing solvents, with a change in the stereochemistry of the metal. Coordination localizes π-electrons in nitrogen, weakens the ring bonds, and strengthens the exocyclic P—N bonds, as expected theoretically. Approximate values of ligand field parameters of the Co(NO3)2 and Ni(NO3)2 complexes are similar to those of complexes formed by simple amines; the phosphazenes act as σ-donors, their acceptor levels not being used significantly.

Tuning of Magnetic Properties of Polynuclear Lanthanide(III)−Octacyanotungstate(V) Systems:  Determination of Ligand-Field Parameters and Exchange Interaction

2007 ◽  
Vol 46 (21) ◽  
pp. 8924-8938 ◽  
Author(s):  
Paweł Przychodzeń ◽  
Robert Pełka ◽  
Krzysztof Lewiński ◽  
Justyna Supel ◽  
Michał Rams ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Exchange Interaction ◽  
Ligand Field ◽  
Ligand Field Parameters

Magnetic and Spectral Studies on Cobalt(II) Fluorosulfate

1971 ◽  
Vol 49 (3) ◽  
pp. 511-515 ◽  
Author(s):  
J. M. Taylor ◽  
R. C. Thompson
Keyword(s):  
Infrared Spectrum ◽  
Electronic Spectrum ◽  
Magnetic Moment ◽  
No Reduction ◽  
Electron Delocalization ◽  
Spectral Studies ◽  
Ligand Field ◽  
Ligand Environment ◽  
Free Ion ◽  
Ligand Field Parameters

The magnetic moment of cobalt(II) fluorosulfate has been measured over the temperature range 312 to 120 °K and the results agree with theory for cobalt(II) in a regular octahedral ligand environment with λ equal to the free-ion value and no reduction in the magnetic moment due to electron delocalization. From its electronic spectrum, values of the ligand-field parameters Dq and B are estimated to be 765 and 860 cm−1, respectively. The infrared spectrum shows no distortion of the fluorosulfate groups from C3v symmetry.

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.

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