Solid-emissive boron–fluorine derivatives with large Stokes shift

Structure–property correlation of solid-emissive boron–fluorine derivatives

“…For comparison, concentrationdependent fluorescent spectra for BOPIM 1 (Fig. 3E) and 2 [25] only show one emissive peak with no shift at all. It indicates that BOPIM 3 may form other emissive species through intermolecular interactions of nitro groups [28e31], especially in concentrated solution.…”

“…In the crystal structures of BOPIM 2 [25], intermolecular interactions (such as CeH/N, CeH/B, etc.) provide a rigid structure to inhibit planar pep stacking in crystal state, which is also found for BOPIM 1 (Fig.…”

Intermolecular hydrogen bonding-assisted high contrast fluorescent switch in the solid state

“…The synthesis and characterizations of precursor BOPIM dye have been reported by our group [37]. Photochromic DTE1 and DTE2 were synthesized according to previous reports [39].…”

“…Recently, we developed a series of highly solid-emissive BoroneFluorine dyes (BOPIM), with Boron 2-(2 0 -pyridyl)imidazole as the main chromophore [37]. Various intermolecular non-covalent bonds, such as hydrogen bond, halogen bond, are formed to promote non-parallel packing, thus inhibiting ACQ.…”

A new pH fluorescent molecular switch by modulation of twisted intramolecularcharge transfer with protonation

“…[5,6] Boron 2-(2′-pyridyl) imidazole complex (BOPIM) derivatives, synthesized in our research group, is one class of these samples, which emit intense fluorescence both in solutions and also in solid state with large Stokes shift. [7][8][9][10] Since Lippert studied the intramolecular charge transfer (ICT) process of DMABN, [11] several experimental and theoretical investigations postulate that its emission results from the twisted ICT state of the dialkylamino group. [12][13][14][15] It is also found that ICT process can be mediated by acid or base, due to the protonation or deprotonation.…”