Vanadium energy level diagrams

Fig. 17. Energy level diagram for the vanadium(III) ion (d ) in a five-coordinate chromophore of Dan symmetry. The diagram is valid for the ratios DsjDt= 1/3 and CjB — A.S. The dotted lines indicate the DtjB ratio found for VCls(NMe3)2. [(By permission of J. Chem. Soc. (Ref. (14))]...

Which of the following is the correct orbital diagram for the third and fourth principal energy levels of a vanadium atom (Z = 23) Justify your answer. 

As we have seen in Fig. 2, the diagrams of the energy levels for d are relatively simple. In the case however of the oxovanadium(IV) complexes, the strong covalent bond between vanadium and oxygen, which is probably not a single bond, renders the simple crystal field treatment quite unsatisfactory and makes a molecular orbital treatment necessary. 

The schematic diagram in Figure 2.12(a) shows the order in which the levels fill, from bottom to top in energy. For example, Ti has two 4s electrons, one in each spin level, and two 3d electrons, both with the same spin. Fe has two 4s electrons, one in each spin level, five 3d electrons with spin- , and one 3d electron with spin -i- . For vanadium, the first two electrons enter the 4, -j and 4s, +j levels the next three are all in the 3d, level, and vanadium has the configuration 4s 3d. The 3d, -j line crosses the 4s, +j line between V and Cr. When the six electrons of chromium are filled in from the lowest level,... 

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