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23 Transition Metals and Solutions to Exercises Coordination Chemistry 23.44 (a) N N N N Rh Rh N N N N N N optical isomers (b) N Co Co N Br Br (c) CN HN Pd CN NH Color and Magnetism in Coordination Chemistry; Crystal-Field Theory (sections 23.5 and 23.6) 23.45 (a) Visible light has wavelengths between 400 and 700 nm. We cannot see the light with 300 nm wavelength, but we can see the 500 nm light. (b) Complementary colors are opposite each other on a color wheel such as Figure 23.25. (c) A colored metal complex absorbs visible light of its complementary color. For example, a red complex absorbs green light. (d) E(J/photon) = hv = Change photon to kJ/mol. E = 6.626 610 nm X 10⁻³⁴ J 3.00 S 10⁸ m 1 1nm 10⁻⁹ m = 3.259 10⁻¹⁹ = 3.26 10⁻¹⁹ J 3.259 photon 10⁻¹⁹ J 1000 1kJ J 6.022 mol photons = kJ/mol 23.46 (a) No. The complex absorbs light with a range of wavelengths not in the visible range, so all visible light is transmitted and the complex appears white. (b) No. A solution can appear green by transmitting or reflecting only green light (the situation stated in the exercise) or by absorbing red light, the complementary color of green. 703