| http://www.w3.org/ns/prov#value | - In particularly preferred embodiments, J is a linker, e.g. 4,4???-diphenylethyne, 4,4???-diphenylbutadiyne, 4,4???-biphenyl, 1,4-phenylene, 4,4???-stilbene, 1,4-bicyclooctane, 4,4???-azobenzene, 4,4???-benzylideneaniline, 4,4???-terphenyl, etc.
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