| http://www.w3.org/ns/prov#value | - These include compositions of matter of the formula [CnHL???[X???Ra]m [0154] where n is an integer, L is a number less than 0.1 n, m is less than 0.5 n, a is zero or a number less than 10, X is a polynuclear aromatic, polyheteronuclear aromatic or metallopolyheteronuclear aromatic moiety and R is as recited above. [0155] Preferred cyclic compounds are planar macrocycles as described on p. 76 of Co
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