![]() ![]() ![]() Examples of rigid/semirigid ligands that can impose their preferred coordination geometry on a metal center. For NHC Dipp Cu( 4-Si 9)H 2 a reduced proton hopping was identified compared to HSi 9 3. This is one of the more important factors and many metals tend to exhibit preferred coordination numbers, which depend on their oxidation state and size as shown in Figure \(\sf\). The protonated, coinage metalated silicide NHC Dipp Cu( 4-Si 9)H 2 was detected and characterized in liquid ammonia by NMR spectroscopy, and the results were corroborated by theoretical calculations. One reason coordination numbers do not increase indefinitely is that only so many ligands can fit around a metal. Accordingly, Cu DOUCPU contains triple dynamic bonds including revers-ible DOU covalent bonds, Cu DOU coordination bonds, and hydrogen bonds. Steric effects, specifically steric repulsions between ligands. such as Cu2 from CuCl 2 to form a complex.
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