Abstract
In this study, we report a synthetically simple donor-acceptor (D-A)-type organic solid-state emitter 1 that displays unique fluorescence switching under mechanical stimuli. Orange and yellow emissive crystals of 1 (1O, 1Y) exhibit an unusual "back and forth" fluorescence response to mechanical force. Gentle crushing (mild pressure) of the orange or yellow emissive crystal results in hypsochromic shift to cyan emissive fragments (λem = 498-501 nm) with a large wavelength shift Δ λem = -71 to -96 nm, while further grinding results in bathochromic swing to green emissive powder λem = 540-550 nm, Δ λem = +40 to 58 nm. Single-crystal X-ray diffraction study reveals that molecules are packed by weak interactions, such as C-H···π, C-H···N, and C-H···F, which facilitate intermolecular charge transfer in the crystal. With the aid of structural, spectroscopic, and morphological studies, we established the interplay between intermolecular and intramolecular charge-transfer interaction that is responsible for this elusive mechanochromic luminescence. Moreover, we have also demonstrated the application of this organic material for chlorine gas sensing in solid state.
| Original language | English |
|---|---|
| Pages (from-to) | 5291-5300 |
| Number of pages | 10 |
| Journal | ACS Omega |
| Volume | 3 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 31 May 2018 |
| Externally published | Yes |
Bibliographical note
Funding Information:M.K.P. acknowledges Council of Scientific and Industrial Research (CSIR, Govt. of India) for fellowship and thanks the Director, CSIR-National Institute for Interdisciplinary Science & Technology, Thiruvanthapuram, for providing facilities. M.K.P. thanks Rachid Rezgui, Core Technology Platform, New York University Abu Dhabi, UAE, for his help with fluorescence lifetime study.
Funding Information:
This work was financially supported by the CSIR Lab Fund availed at National Institute for Interdisciplinary Science & Technology, Thiruvanthapuram and ISRO RESPOND GAP 137039. A.A. acknowledges UGC, New Delhi, for Junior Research Fellowship. B.M. acknowledges SERB, New Delhi, for the grant SB/S1/OC-48/2013.
Funding Information:
*E-mail: [email protected]. Tel: +91-9748-261 742, +91-33-2587 3020 (B.M.). *E-mail: [email protected], [email protected]. Tel: +91 471-253-5608 (M.K.P). ORCID Manas K. Panda: 0000-0002-6297-2070 Author Contributions ∇A.A. and T.P. contributed equally to this manuscript. Funding This work was financially supported by the CSIR Lab Fund availed at National Institute for Interdisciplinary Science & Technology, Thiruvanthapuram and ISRO RESPOND GAP 137039. A.A. acknowledges UGC, New Delhi, for Junior Research Fellowship. B.M. acknowledges SERB, New Delhi, for the grant SB/S1/OC-48/2013. Notes The authors declare no competing financial interest.
Publisher Copyright:
© 2018 American Chemical Society.
Funding
M.K.P. acknowledges Council of Scientific and Industrial Research (CSIR, Govt. of India) for fellowship and thanks the Director, CSIR-National Institute for Interdisciplinary Science & Technology, Thiruvanthapuram, for providing facilities. M.K.P. thanks Rachid Rezgui, Core Technology Platform, New York University Abu Dhabi, UAE, for his help with fluorescence lifetime study. This work was financially supported by the CSIR Lab Fund availed at National Institute for Interdisciplinary Science & Technology, Thiruvanthapuram and ISRO RESPOND GAP 137039. A.A. acknowledges UGC, New Delhi, for Junior Research Fellowship. B.M. acknowledges SERB, New Delhi, for the grant SB/S1/OC-48/2013. *E-mail: [email protected]. Tel: +91-9748-261 742, +91-33-2587 3020 (B.M.). *E-mail: [email protected], [email protected]. Tel: +91 471-253-5608 (M.K.P). ORCID Manas K. Panda: 0000-0002-6297-2070 Author Contributions ∇A.A. and T.P. contributed equally to this manuscript. Funding This work was financially supported by the CSIR Lab Fund availed at National Institute for Interdisciplinary Science & Technology, Thiruvanthapuram and ISRO RESPOND GAP 137039. A.A. acknowledges UGC, New Delhi, for Junior Research Fellowship. B.M. acknowledges SERB, New Delhi, for the grant SB/S1/OC-48/2013. Notes The authors declare no competing financial interest.