Download Mechanochromic fluorescent materials : phenomena, materials by Jiarui Xu; Zhenguo Chi; Royal Society of Chemistry (Great PDF
By Jiarui Xu; Zhenguo Chi; Royal Society of Chemistry (Great Britain)
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Extra info for Mechanochromic fluorescent materials : phenomena, materials and applications
Sample text
19 41 (A) The images of dye 25 (a) as-prepared powder under ambient light; (b) as-prepared powder under UV light; (c) shearing powder under UV light. (B) Illustrations of luminescent color variation from blue to bright green. Reproduced with permission from reference 57. Copyright 2012, Wiley-VCH. advantages of dye 25. 19B):57 (1) freedom in molecular motion is crucial in luminescent color switching. In an as-prepared powder state, the complex interactions between branched groups, especially hydrogen bonding interactions, can inhibit molecular mobility and confine the orientation of pyrene groups to a partially overlapped architecture in the excited state.
95Â10À3 The fluorescence intensity at 550 nm excited at 370 nm. The kF and kS correspond to faster and slower rate constants. Reproduced with permission from reference 54. Copyright 2013, The Royal Society of Chemistry. 2 39 Kinetic and activation parameters of the thermal back-reaction. 5 À104 À191 À116 À172 À192 À230 Dye 22a Dye 23 Reproduced with permission from reference 54. Copyright 2013, The Royal Society of Chemistry. equation k ¼ (kBT/h) exp(DSz/R)exp(ÀDHz/RT), where kB is the Boltzmann constant.
Copyright 2013, The Royal Society of Chemistry. 2 39 Kinetic and activation parameters of the thermal back-reaction. 5 À104 À191 À116 À172 À192 À230 Dye 22a Dye 23 Reproduced with permission from reference 54. Copyright 2013, The Royal Society of Chemistry. equation k ¼ (kBT/h) exp(DSz/R)exp(ÀDHz/RT), where kB is the Boltzmann constant. 6 kJ molÀ1 for the slower component, and the DSzs are À104 J KÀ1 for the faster component and À191 J KÀ1 for the slower component. 2. The estimated DSz values are negative, suggesting the order parameter of the activated complex is higher than that of the initial amorphous phase.