The application discloses a D-A-D type organic
small molecule, nanoparticles containing the same, and a preparation method and application thereof. The D-A-D type organic
small molecule and the nanoparticles thereof are particularly suitable for precise photothermal treatment and real-time
imaging guidance of hematological malignancies such as
leukemia,
lymphoma and
multiple myeloma. The D-A-D type organic
small molecule constructs a D-A-D type conjugated structure, realizes near-
infrared absorption
red shift to 685 nm through enhancing intramolecular charge transfer (ICT) effect, and promotes non-
radiative transition by using high
excited state reorganization energy (
lambda=1.29eV), with a
photothermal conversion efficiency of more than 35%. The small molecule does not contain
metal and
halogen, has a molecular weight of about 878 Da, and has good
biocompatibility and metabolic potential. The small molecule is self-assembled into nanoparticles with a particle size of about 130 nm, and has good colloidal stability and passive targeting ability. Meanwhile, the high
molar absorption coefficient and high-efficiency
photothermal conversion characteristics of the small molecule endow the small molecule with strong photoacoustic imaging capability, and the small molecule can be used for real-time monitoring of
drug distribution and realization of 'diagnosis and treatment integration'.