Journal
SMALL METHODS
Volume 6, Issue 12, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smtd.202200936
Keywords
circularly polarized luminescence; photophysics; platinum; supramolecular chirality; vortex flow
Funding
- Japan Society for the Promotion of Science (JSPS) through Kakenhi [JP20J118421, JP16H06516, JP20H02753, JP20H00392]
- Program for Leading Graduate Schools Interactive Materials Science Cadet Program (Osaka University)
- Henry Dreyfus Teacher-Scholar Award
- San Jose State University Emeritus and Retired Faculty Association Faculty Research and Creative Activity Award
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This study reports the precise control of circularly polarized luminescence (CPL) under vortex flow conditions at an air-water interface. The vortex flow induces and controls the supramolecular chirality of aggregates, allowing for precise adjustment of the CPL direction and magnitude.
Circularly polarized luminescence (CPL) has been researched for various applications by control of characteristics such as chirality and magnitude. Supramolecular chirality has been prepared by vortex motion as a mechanical stimulus; however, CPL has yet to be controlled precisely and reproducibly. In this work, the first precise control of CPL under vortex flow conditions at an air-water interface is reported. The supramolecular chirality of aggregates consisting of an achiral trans-bis(salicylaldiminato)Pt(II) complex bearing hexadecyl chains is induced and controlled with vortex flow at the air-water interface, whereas the complex naturally forms an achiral amorphous solid with non-chiroptical properties under non-vortex conditions. The CPL direction and magnitude (g(lum) value) of the Pt(II) complex aggregates can be adjusted precisely according to the vortex conditions, including the rotatory direction and flow rate. Vortex-flow-induced emission enhancement is also observed upon an increase in the rate of the vortex flow.
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