| http://www.w3.org/ns/prov#value | - ch that at least one physical property of the indicator are altered during use, wherein the receptor comprises a compound of the formula: (R1)n --X--(R2)m wherein X comprises carbocyclic systems or C1-C10 alkanes, n is an integer of at least 2, m is an integer of at least 1; and wherein each of R1 independently represents --(CH2)y --NR3 --C(NR4)--NR5, or --(CH2)y --NR6 R7 ;where y is an integer of
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