Cr-X bonds

Placing a proton on the X group presumably weakens the Cr-X bond. The enhanced lability is due to a reduced enthalpy of activation, compared with that associated with the step. Normally, the removal of unidentate ammonia or amine ligands from metal complexes is not accelerated by acid, since the nitrogen is coordinately saturated. This situation changes when we consider multidentates (Sec. 4.4.2). [Pg.213]

In the halides bridging anions lead to distorted CrXe octahedra sharing corners in which there are four short approximately equal Cr—X bonds and two long trans Cr—X bonds. There is also angular distortion of the octahedra. The fluoride has the tetragonal (distorted) rutile structure and the other halides chain-type structures. The mixed crystal (Mn, Cr)I2 is isotypic with monoclinic Crl2 (Table 34). [Pg.755]

We find that the eg distortions derived from the Ham quenching and the intensity distribution in the progression differ by less than ten per cent, thus confirming the soundness of our analytical procedure. In order to get the actual displacements in Cr-X bond lengths, A(Cr-X)e j and A(Cr-X)ax, for the equilibrium geometry of the luminescent T2 state, the AQ values have to be linearly transformed (17). For the > component of T2g the values in the last two columns of Table II are obtained. The result for the Cs2NaYClg lattice is visualized in Figure 7. [Pg.9]

Table 7 Angular overlap parameters ea and en for Cr-X bonds and B from ATT. FT (LFModel 2) along with their values deduced from optical d-d transitions (denoted here as exp. ) taken from literature3...

Table 9 CASSCF energies of triplet states of D2a distorted CrX4 complexes3,13 used to deduce AOM parameters ea and en for the Cr-X bond and B and their AILFT values0 ...

The reactions are first order in each reagent, independent of [H ], and decrease in the order ki > Icbt < ci- An inner-sphere mechanism is postulated, the effect of C-X bond cleavage being considered more important than that of Cr-X bond formation. The stoichiometry of the corresponding reaction with CCI4 is of reaction of 2 mol of Cr(II) per mole of CrCP" and Creels being... [Pg.57]

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