Mononuclear oxo thiolato compounds of molybdenum(V)

1978 ◽  
Vol 31 (2) ◽  
pp. 279 ◽  
Author(s):  
IW Boyd ◽  
IG Dance ◽  
KS Murray ◽  
AG Wedd
Keyword(s):  
Magnetic Susceptibility ◽  
Charge Transfer ◽  
Solid State ◽  
Spectral Data ◽  
Electronic Spectra ◽  
Charge Transfer Transition ◽  
Electronic Spectral Data

The intensely blue salts B+ [MoO(SAr)4]- (B+ = quaternary cation; Ar = phenyl, p-tolyl) have been isolated. Magnetic susceptibility, e.s.r., conductance and electronic spectral data indicate that the complexes are essentially mononuclear both in the solid state and in solution. The solution electronic spectra exhibit an intense maximum at 598 nm, which is tentatively assigned to a sulphur-to-molybdenum charge- transfer transition.

Iron complexes of pyridylimidazole derivatives

1977 ◽  
Vol 30 (4) ◽  
pp. 771 ◽  
Author(s):  
AT Baker ◽  
HA Goodwin
Keyword(s):  
Charge Transfer ◽  
Spectral Data ◽  
High Spin ◽  
Mössbauer Effect ◽  
Spin Transition ◽  
Iron Complexes ◽  
Mossbauer Effect ◽  
Effect Data ◽  
Electronic Spectral Data

Complexes of iron(II) with 2-(2-pyridyl)benzimidazole (pbi) and 2-(6- methyl-2-pyridyl)benzimidazole (mpbi) have been characterized. [Fe(pbi)3] [BF4]2 undergoes a temperature-induced spin transition the course of which is determined by the extent of hydration. [Fe(mpbi)3] [ClO4]2 is high-spin and the differences in the properties of the two complexes are correlated with electronic spectral data. [Fe(pbi)2(CN)2] is low-spin. Iron(III) complexes of deprotonated pbi and 2-(2- pyridyl)imidazole (pyim), [Fe(pbi-H)3] and [Fe(pyim-H)3], result when the cationic iron(II) complexes are treated with base. Magnetic and Mossbauer effect data show that these complexes, which display strong π → t2 charge-transfer absorption, are low-spin.

Synthesis, Electronic Spectra and Solvent-Induced Reversible Dissociation of Diphosphine(hexafluoroacetylacetonato)copper(I) Complexes

2003 ◽  
Vol 58 (10) ◽  
pp. 950-954 ◽  
Author(s):  
Valeri Pawlowski ◽  
Andreas Strasser ◽  
Arnd Vogler
Keyword(s):  
Charge Transfer ◽  
Solid State ◽  
Electronic Spectra ◽  
Ion Pairs ◽  
Excitation Spectra ◽  
Polar Solvents ◽  
Long Wavelength ◽  
Reversible Dissociation ◽  
Ligand Charge Transfer

The complexes CuI(P-P)(hfac) with P-P = 1,2-bis(diphenylphosphino)ethane (diphos), 1,3-bis-(diphenylphosphino)propane (prophos), 2,2’-bis(diphenylphosphino)-1,1’-binaphthyl (binap) and hfac = hexafluoroacetylacetonate were synthesized and spectroscopically characterized. In the solid state or in solutions of non-polar solvents these compounds are yellow owing to a long-wavelength (hfac− →P-P) ligand-to-ligand charge transfer absorption. In coordinating solvents such as CH3CN the complexes undergo a reversible dissociation according to the equation: Cu(P-P)(hfac) + n CH3CN ⇌ [Cu(P-P)(CH3CN)n]+hfac−.While the complexes are not luminescent the ion pairs [Cu(P-P)(CH3CN)n]+hfac− are emissive at 77 K. The cations and the anions show separate emissions as indicated by the excitation spectra.

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