Reactivity in polynuclear transition metal chemistry as a means to obtain high-spin molecules: substitution of µ4-OH– by η1,µ4-N3– increases nine times the ground-state S value of a nonanuclear nickel(ii) cage

2001 ◽  
pp. 2414-2415 ◽  
Author(s):  
Giannis S. Papaefstathiou ◽  
Albert Escuer ◽  
Ramon Vicente ◽  
Merce Font-Bardia ◽  
Xavier Solans ◽  
...  
Keyword(s):  
Transition Metal ◽  
High Spin ◽  
Ground State ◽  
Transition Metal Chemistry ◽  
Metal Chemistry

M÷ssbauer studies in transition metal chemistry. I. Compounds of iron with Dithioacetylacetone (Pentane-2,4-dithione)

1971 ◽  
Vol 24 (11) ◽  
pp. 2231 ◽  
Author(s):  
RL Martin ◽  
IAG Roos
Keyword(s):  
Transition Metal ◽  
Temperature Dependence ◽  
Quadrupole Splitting ◽  
Ground State ◽  
Mössbauer Spectra ◽  
Transition Metal Chemistry ◽  
Temperature Dependent ◽  
Orbital Degeneracy ◽  
Metal Chemistry ◽  
Mossbauer Spectra

The temperature dependence of the Mossbauer spectra of some iron- containing compounds of dithioacetylacetone are reported between 4 and 293 K. ��� The quadrupole splitting ΔEq of [Fe(SacSac)3] is larger than usually observed for low-spin six-coordinated iron(III) and is ascribed to the lifting of orbital degeneracy of the 2T2 ground state by small axial and rhombic distortions. ��� The unsubstituted and phenyl-substituted dithiolium salts of [FeCl4]2- exhibit strongly temperature-dependent quadrupole splittings, which arise directly from the lifting of the orbital degeneracy of the 5E ground state due to distortion of the [FeCl4]2- tetrahedron.

Mossbauer studies in transition metal chemistry. II. Iron(III) methoxides and halomethoxides

1974 ◽  
Vol 27 (9) ◽  
pp. 1833 ◽  
Author(s):  
RL Martin ◽  
IAG Roos
Keyword(s):  
Transition Metal ◽  
High Spin ◽  
Layer Structure ◽  
Magnetic Moments ◽  
Three Dimensional ◽  
Transition Metal Chemistry ◽  
Mössbauer Studies ◽  
Metal Chemistry ◽  
Lattice Effects ◽  
High Spin Iron

M�ssbauer spectra are reported for a series of insoluble methoxide and halomethoxide complexes of tervalent iron which are known to exhibit pronounced antiferromagnetic interactions.1-3 The M�ssbauer study confirms that all the compounds contain high-spin iron(111) and that the reduced magnetic moments arise from antiferromagnetically coupled iron atoms within polymerized species. The quadrupole splittings which are due solely to lattice effects and anisotropic bonding are consistent with some of the previously proposed structures but definitely exclude others. It is concluded that the M�ssbauer data are better rationalized in terms of a three-dimensional layer structure in which the ratio of halogen to methoxide is progressively varied in a FeX3 lattice.

High-valent transition metal chemistry. Moessbauer and EPR studies of high-spin (S = 2) iron(IV) and intermediate-spin (S = 3/2) iron(III) complexes with a macrocyclic tetraamido-N ligand

1993 ◽  
Vol 115 (15) ◽  
pp. 6746-6757 ◽  
Author(s):  
Kimberly L. Kostka ◽  
Brian G. Fox ◽  
Michael P. Hendrich ◽  
Terrence J. Collins ◽  
Clifton E. F. Rickard ◽  
...  
Keyword(s):  
Transition Metal ◽  
High Spin ◽  
Transition Metal Chemistry ◽  
Metal Chemistry ◽  
Intermediate Spin ◽  
High Valent

Transition metal chemistry in synthetically viable alkaline earth complexes M(Cp)3– (M = Ca, Sr, Ba)

2021 ◽  
Author(s):  
Bin Huo ◽  
Rui Sun ◽  
Bo Jin ◽  
Lingfei Hu ◽  
Jian-Hong Bian ◽  
...  
Keyword(s):  
Transition Metal ◽  
Oxidation State ◽  
Alkaline Earth ◽  
Transition Metal Chemistry ◽  
Metal Chemistry

We predicted the stable alkaline earth complexes M(Cp)3– (M = Ca, Sr, Ba; Cp = cyclopentadienyl), where the M centers were in their stable +2 oxidation state and mimicked the...

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