Ferrocene Receptores Bearing Thiourea Moiety And Their Multi-respond To Ions

Anion or cation recognition is an important research area in Molecular recognition. Thiourea subunits currently used for the design of neutral receptors for anion, owning to their ability to act as H-bond donors. Meanwhile, the atoms N, S of thiourea are good for cation coordination.And the N of shiffe-base is a good bonding site for metal ions.1, Two ferrocenyl anion receptors(1 and 4) with multiple binding sites of amide group and thiourea group were designed and synthesized, their photochemical property and electrochemical behaviors were studied. Also we studied the recognition of anions by 1HNMR titrations. The results showed that 1 showed specific fluorescence enhencement response to AcO-.2,Ferrocenyl-containing acyl thiourea derivatives(7,8,11) was synthesized, their optical spectroscopic and electrochemical were studied. The structures for all these new compounds were fully characterized by IR and 1H NMR. Among various metal ions,8 shows multi-respond to Cu2+, shows exclusive emission-on and an anode shift of the Fe(â…¡)/Fe(â…¢) potential. The MLCT of 11 red-shifted by a Δλmax of 27 nm When aditioned Hg2+, also with an anode shift of the Fe(II)/Fe(III) potential.3,A new ferrocene-anthracene dyad bearing shiffe-base donor 12 has been synthesized and characterized. Its metal ions recognition ability is investigated by UV-Vis spctra, emission spectra and cyclic voltammetry (CV). Among various metal ions,12 shows multi-respond to Cr3+, Cu2+and Hg2+, with a～100 nm red-shift of the low energy Fe(â…¡)â†'Cp charge transfer located at 407 nm, which can be observed color change from yellow to red by naked eyes, and an anode shift of the Fe(â…¡)/Fe(III) potential.In addition,12 shows exclusive emission-on sensing to Cr3+.