Patent ID: 6924380

Claim:
A calixarene dimer of the general formula I-G comprising a first calixarene moiety of general formula I and a second calixarene moiety G, wherein: L is [—CH 2 —] or [—O—CH 2 —O—] and is the same or different between each aryl group; R 5 is H, NO 2 , halogen, or C 1 -C 10 aliphatic hydrocarbyl group, C 6 -C 20 aryl group, C 6 -C 20 aryl group, C 6 -C 20 hydrocarbylaryl group, any of which is optionally substituted by one or more halo or oxo groups or interrupted by one or more oxo or amide groups, and R 5 is the same or different on each aryl group; R 1 comprises a carboxy group which is not protonated or protected; two groups out of R 2 , R 3 and R 4 are H; the one group out of R 2 , R 3 and R 4 not being H comprises at least one atom of one or both of O and S, the said at least one atom being capable of causing the calixarene to be adsorbed onto the surface of the substrate; and the one group out of R 2 , R 3 and R 4 not being H is conjugated to the second calixarene moiety, G, wherein, the one group of R 2 , R 3 and R 4 not being H conforming to the general formula (A): [—X—Y—S—] (A) wherein X is any one of R and Y being the same or different and being C 1 -C 10 aliphatic hydrocarbyl group, C 6 -C 10 aryl group or C 6 -C 20 hydrocarbylaryl group, any of which may be optionally substituted by one or more halo or oxo groups or interrupted by one or more oxo or amide groups; R′ is H, C 1 -C 10 aliphatic hydrocarbyl group, C 6 -C 10 aryl group or C 6 -C 20 hydrocarbylaryl group, any of which may be optionally substituted by one or more halo or oxo groups or interrupted by one or more oxo or amide groups; wherein S is conjugated to the second calixarene moiety G.