3. In the paper referenced below, the authors use NMR to analyze an Ir(III) comp

Question

3. In the paper referenced below, the authors use NMR to analyze an Ir(III) complex Regeneration of an Ir Complex Active for Alkane Dehydrogenation Using Molecular Oxygen" by Kate E. Allen, D. Michael Heinekey, Alan S. Goldman. Karen I. Goldberg. Organometallics. 2014. 33, 1337-1340 a. What is the electron configuration of Ir? b. What is the electron configuration of Ir(III? The Ir(III) complex that Goldberg et al studied in this paper is shown below Draw a ligand field diagram for the complex (shown below) assuming no distortions. (Hint: What is the shape at III? Ir d. Goldberg et al characterized the Ir(III) complexes using H NMR. Recal that NMR is only useful for analyzing diamagnetic compounds. Knowing this information, is the complex high-spin or low-spin? Explain your answer, using d- electron orbital diagrams.

Explanation / Answer

a:

Atomic number of Ir = 77

Electronic configuration of Ir: 1s22s22p63s23p63d104s24p64d105s25p64f145d76s2

or  [Xe] 4f145d76s2

b:

Electronic configuration of Ir(III): [Xe] 4f145d6

When Ir goes to an excited state, it loses 3 electrons from the outermost shells. Hence no of electrons for Ir(III)=74

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