Rotation by bulky substituents

Some azobenzenes that are locked against rotation by bulky substituents in all four ortho positions may show fluorescence when frozen rigidly at 77 K 2,2 ,4,4 ,6,6 -hexaisopropyl 2,2 -difflethyl-4,4 6,6 -tetra-tert-butyl azobenzene belong to this series. Azobenzenophanes 7 to 13 do not emit, even at 77 K this is the expectation for card-packed dimers. 

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See also in sourсe #XX -- [ ]

See also in sourсe #XX -- [ ]

See also in sourсe #XX -- [ ]

See also in sourсe #XX -- [ ]

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