(a) The following complexes each possess one of the structures listed in Table 19.4. Use the point group to deduce each structure: [ZnCl₄]²⁻ (T_d); [AgCl₃]²⁻ (D_3h); [ZrF₇]³⁻ (C_2v); [ReH₉]²⁻ (D₃h); [PtCl₄]²⁻ (D₄h); [AuCl₂]⁻ (D_∞h).

(b) How does the coordination environment of Cs⁺ in CsCl differ from that of typical, discrete 8-coordinate complexes? Give examples to illustrate the latter, commenting on factors that may influence the preference for a particular coordination geometry.

Table 19.4.

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Coordination number 2 3 4 5 6 N 7 00 8 9 Arrangement of donor atoms around metal centre Linear Trigonal planar Tetrahedral; square planar Trigonal bipyramidal; square-based pyramidal Octahedral Pentagonal bipyramidal Dodecahedral; square antiprismatic; hexagonal bipyramidal Tricapped trigonal prismatic Less common arrangements Trigonal pyramidal Trigonal prismatic Monocapped trigonal prismatic; monocapped octahedral Cube; bicapped trigonal prismatic