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23 Transition Metals and Solutions to Exercises Coordination Chemistry (c) Siderophores are iron-binding compounds or ligands produced by a microorganism. They compete on a molecular level for iron in the medium outside the organism and carry needed iron into the cells of the organism. 23.75 (a) (b) + green brown-orange [Cr(en)₂(H₂O)₂]³⁺ and are spectator ions in the second reaction. (c) Zn(NO₃)₂(aq) + 2NaOH(aq) (d) + 23.76 (a) pentacarbonyliron(0) (b) Since CO is a neutral molecule, the oxidation state of iron must be zero. (c) has two geometric isomers. In a trigonal bipyramid, the axial and equatorial positions are not equivalent and not superimposable. One isomer has CN in an axial position and the other has it in an equatorial position. CN CO OC OC Fe CO Fe CN OC OC CO CO 23.77 (a) left shoe (c) wood screw (e) a typical golf club 23.78 (a) d² (b) These complexes are colored because the crystal-field splitting energy, is in the visible portion of the electromagnetic spectrum. Visible light with = is absorbed, promoting one of the d-electrons into a higher energy d-orbital. The remaining wavelengths of visible light are reflected or transmitted; the combination of these wavelengths is the color we see. (c) will absorb light with higher energy. H₂O is in the middle of the spectrochemical series, and causes a larger than F⁻, a weak-field ligand. Since and are inversely related, larger corresponds to higher energy and shorter 710