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Four phenanthroimidazole ferrocene derivatives (2a-2d) were designed, synthesized and characterized by 1 H NMR, 13 C NMR and high-resolution mass spectroscopy (HRMS). Recognition of 12 anions by 2a-2d was investigated by UV-Vis absorption analysis, showing that 2b and 2d sensed B 4 O 7  2- selectively among the tested anions with an obvious color change observed. 1 H NMR titrations and theoretical calculations demonstrated that 2b binds B 4 O 7  2- through O⋯H hydrogen bonding and O⋯B interactions between the nitro moiety and the B 4 O 7  2- anion.

rsc advances

The first colorimetric receptor for the B4O72− anion based on nitro substituted phenanthroimidazole ferrocene derivatives