The restricted rotation of alkyl groups in substituted 1,10-phenanthroline chelates with chromium-(II) originates from an electronic rather than a steric effect, and can be rationalized by π back-bonding.
G. N. La Mar and G. R. Van Hecke, J. Chem. Soc. D, 1971, 274 DOI: 10.1039/C29710000274
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