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Pyrazoline derivatives have been investigated in many respects
due to their blue light emission with high quantum yield
[10e14], ready accessibility, and easily being used as carrier
transporting as well as emitting materials [15]. Many have
been reported as hole transporting or emitting materials in organic
EL devices [16e18]. And also it is well known that the
naphthalimide usually exhibits strong fluorescent emission on
irradiation, which usually acts as supermolecular moieties for
the study of photo-induced electron transfer [19,20], fluorescence
switcher [21] or liquid crystal displays [22]. Recently,
naphthalimide derivatives utilized as EL materials have been
reported [23,24], whose fluorescence emission can be widely
tuned (from blue to yellow, green and even red) with aminoand
alkoxy-groups at the 4-position of naphthalimide. Many
multichromophore compounds have been synthesized [9,25].

Our group has previously reported the synthesis of several
benzothiazoyl pyrazoline derivatives containing aromatic heterocycle,
which have good blue fluorescence. In this paper, we
synthesized a series of novel bischromophore compounds containing
pyrazoline and naphthalimide groups using 4-hydrazinenaphthalimides
and chalcones (Scheme 1), which had good
green light fluorescence. These bischromophore compounds
have seldom been reported previously.
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