Quadrupole splitting parameter

The various, solid-state stereochemistries just described may often be distinguished fairly readily by " Sn Mossbauer spectroscopy 5-9, 452), particularly from the value of the quadrupole splitting parameter, AEq (see Table II). 

The spin state of the compounds XFe(R2dtc)2 is 3/2 (64). Mossbauer spectra of ClFe(Et2 tc)2 in solution are almost identical with the spectrum of the six-coordinated Fe(Et2magnetic susceptibility and in the isomer shift and quadrupole splitting parameters suggests a geometrical correspondency in solution, which can be attained by the binding of a solvent molecule to the sixth coordination site of the ClFe(Et2[Pg.98]

Once available, and supplemented by the nuclear contribution, the EFG tensor can be diagonalized. The numerically largest element (in atomic units) defines the value of q which is in turn used to calculate the quadrupole splitting parameter... 

Foyt et al. [137] interpreted the quadrupole-splitting parameters of low-spin ruthenium(II) complexes in terms of a crystal field model in the strong-field approximation with the configuration treated as an equivalent one-electron problem. They have shown that, starting from pure octahedral symmetry with zero quadrupole splitting, A q increases as the ratio of the axial distortion to the spin-orbit coupling increases. 

Chemical information from hafnium Mossbauer spectroscopy can primarily be deduced from the quadrupole-splitting parameter. In Table 7.4, we have listed the quadrupole coupling constants eQV for some hafnium compounds. Schafer et al. 

Tc magnetic Curie temperature superconducting AEq quadrupole splitting parameter... 

The obtained expansion of Al NMR spectrum in two lines is in agreement with the crystallographic data providing evidence for the presence of two nonequivalent positions of aluminium nuclei in the structure of gibbsite [33], The shape of Al NMR spectrum of the sample LiCl-2Al(OH)3 corresponds to a single position of Al nuclei characterized by quadrupole splitting parameters ... 

The observed lack of a quadrupole splitting for [FeCI(H)(depe)2] suggests that (might be an additive function of the ligands. It should therefore be possible to assign scales of partial quadrupole splitting parameters to the ligands, and this is illustrated below. Such scales allow... 

The simplest treatment of this situation is analogous to the crystal field approach for transition metal complexes. The ligands are considered to act as point charges, and each is assigned a partial quadrupole splitting parameter p.q.s.(L), which is assumed to be independent of the other ligands present, and to have a constant value p.q.s.(L) thus corresponds to an effective value of and different values may apply for different... 

Nuclear quadrupole coupling constants and asymmetry parameters [in brackets] are from single crystal studies. NQCC( Mn) values have also been predicted from partial quadrupole splitting parameters for [Mn(CO)5L] (L = CN, CNR, PPhj, NCS, N3, SbPhj, and and calculated from Wy2 of the NMR resonance for [MnH(CO)5 ... 

Calculated from partial quadrupole splitting parameters. 

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