Organometal coordination by purines: Semi-chelate bonding of modified guanine and isocaffeine with bis(diorganylphosphino)ferrocene-copper

Suitably modified purines including guanine and xanthine derivatives may be coordinated by 1,1′-bis(diorganylphosphino)ferrocene-copper(I) in a variable semi-chelate arrangement with weak O6-Cu interaction.118