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O t h e r complexes involving the + 2 oxida­ tion state are clearly seven-coordinate as exemplified by species such as [W(CO) (diars) (I)]I and [ M o ( C O ) ( L ) I ] (L = bidentate ligand) [24]. Finally, seven-coordinate c o m p o u n d s of the type [ W ( C O ) ( d i a r s ) B r ] can be obtained [24]. Thus, for the zerovalent metal complexes, six-coordination is c o m m o n , while for the + 1 , + 2 , and + 3 oxidation states seven-coordina­ tion is found. I m p o r t a n t work in the area of excited-state chemistry involves the six-coordinate c o m p o u n d s and f / - C H complexes like (III) and (IV).

15, 434 (1976). Copyright by the American Chemical Society. 3 1 1 6 2. 38 350 350 400 400 4 50 500 W a v e leng t h , nm 4 50 500 W a v e l e n g t h , nm 550 Metal Carbonyls 550 600 FIG. 2-3. Electronic spectrum of [ P h A s ] [ T a ( C O ) ] ; cf. Table 2-2 for absorptivities. Reprinted with permission from Wrighton et al. [ 1 1 ] , Inorg. Chem. 1 5 , 4 3 4 (1976). Copyright by the American Chemical Society. —. • Ι ι Γ^· I ' ο ο o\ *t Ο m ο ο ο Γ— Χ ^ <Ν ^ ο as ο *Ό Ό Ό "Ο Ό Ό Ό ^ <ν οο Ο (Ν (Ν (Ν (Ν I *—t (Ν O O o o q n o o h r o ΙΛ <Λ ^ ΙΛ rt (N(NM(N(N(N(N(N Τ-η ϋ > >ϋ >υ > <ϋ> ϋ V-i V-, »-ι U }-* *η C/3 CO CO X) X) X) X> Χ) Χ) Χ) Ο Ο Ο Ο Ο Ο Ο ο ο ο ο ο ο ο Ζ- ^ ^ ^ ^ ^ ^ ri Η (Ν (Ν (Ν (Ν Η Ζ £ υ ϋ ϋ ϋ'-3 m H ^ U U CQ PQ Κ Ε £>Ε ^ » £ < Ρη ^ ^ υ ω Ο υ Χ) ο υ Ζ Η 3 — 1 Β 1 lab 3 Λ 1 ι << ι—I £ Μ 40 2.