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23 Transition Metals and Solutions to Exercises Coordination Chemistry 23.85 (a) 2- CO NC CN Fe NC CN CO (b) sodium (c) +2, 6 d-electrons (d) We expect the complex to be low spin. Cyanide (and carbonyl) are high on the spectrochemical series, which means the complex will have a large splitting characteristic of low spin complexes. 23.86 3- 3- S S Co S S Co S S 23.87 A large part of the metal-ligand interaction is electrostatic attraction between the positively charged metal and the fully or partially negatively charged ligand. For the same ligand, the greater the charge on the metal or the shorter the M-L separation, the stronger the interaction and the more stable the complex. The greater positive charge and smaller ionic radius of a metal in the 3+ oxidation state means that, for the same ligand, complexes with metals in the 3+ state are more stable than those with metals in the 2+ state. 23.88 (a) Only one (b) Two o N N N Zn Pt Pt N N trans N cis (c) Four; two are geometric, the other two are stereoisomers of each of these. N 3+ N 3+ N 3+ N 3+ Co N N Co Co N N Co N N N N 713