摘要 |
A calixarene dimer of the general formula (I-G), comprising a first calixarene moiety 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<SP>5</SP> is H, NO 2 , halogen, or C 1 - C 10 aliphatic hydrocarbyl 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<SP>5</SP> is the same or different on each aryl group; R<SP>1</SP> comprises a carboxy group which is or is not protonated or protected; two groups out of R<SP>2</SP>, R<SP>3</SP> and R<SP>4</SP> are H; the one group out of R<SP>2</SP>, R<SP>3</SP> and R<SP>4</SP> not being H comprises at least one atom of one or more 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<SP>2</SP>, R<SP>3</SP> and R<SP>4</SP> not being H being conjugated to the second calixarene moiety G. The calixarene dimers may be incorporated into sensors. Methods of making the calixarene dimers are disclosed. |