Different types of bonding are present in cyanocuprates 1 and 2, whose crystal structures could be determined (the drawings below show the important structural characteristics). Accordingly, 1 is a lower order cyanocuprate of the type RCu(CN)Li, whereas 2, which is of the type R Cu(CN)Li , does not exist as a "higher order" cyanocuprate with Cu-CN bonds, but rather as a cyano-Gilman cuprate.
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