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BP2VA powder exhibited a strong green emission at
lmax=528 nm, in contrast to its weak orange emission at
lmax=583 nm as a solution in THF. The weak orange emission
was ascribed to a conformational relaxation in solution, which
was reflected by the corresponding photoluminescence (PL)
spectrum of BP2VA at low temperature (77 K; see Figure S1
in the Supporting Information).[5] Furthermore, the emission
of BP2VA aggregation as a solution in THF/water was blueshifted
to lmax=570 nm (from the value lmax=583 nm in
THF; see Figure S2).

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