The reaction between Ca(OH)2 and H212.9 in aqueous solution leads to the formation of the complex [Ca(OH2)2(12.9)]. This crystallizes as a centrosymmetric dimer in which each Ca2+ centre is 8-coordinate. This contains a central Ca2(p-0)2 unit in which each bridging O-donor involves a carboxylate group; only one oxygen atom of each carboxylate group is coordinated. Propose a structure for the centrosymmetric dimer.
Table 12.5 Data for problem 12.14: log K for the formation of the complexes [M(crypi-222)]"^.
M"+ | Na+ | K+ | Rb+ | Mg2+ | Ca2+ | Sr2+ | Ba2+ |
log K | 4.2 | 5.9 | 4.9 | 2.0 | 4.1 | 13.0 | >15 |
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