The crystal engineering of radiation-sensitive diacetylene cocrystals and salts

Abstract

In this work we develop photoreactive cocrystals/salts of a commercially-important diacetylene, 10,12-pentacosadiynoic acid (PCDA, 1) and report the first X-ray crystal structures of PCDA based systems. The topochemical reactivity of...

Boosting Wide‐Range Tunable Long‐Afterglow in 1D Metal–Organic Halide Micro/Nanocrystals for Space/Time‐Resolved Information Photonics

“…Simultaneously tunable optical waveguide colors and wavelengths in the same single microrod could afford a new opportunity to achieve multiple‐channel photonic signal transfer, presenting appealing application prospects in the fields of information storage and optical communications. [ 58 ]…”

“…Simultaneously tunable optical waveguide colors and wavelengths in the same single microrod could afford a new opportunity to achieve multiple-channel photonic signal transfer, presenting appealing application prospects in the fields of information storage and optical communications. [58] As a promising proof of concept, the intriguing excitationdependent optical waveguide property of the 1D micro/nanorod has afforded greatly improved information transmission capacity. Supposing the initial information transmission rate is A bit s −1 , this rate will be enhanced to 3A bit s −1 when three excitation laser sources are applied to this micro/nanorod at a certain interval (Figure 6).…”

Alkali Metal Salts of 10,12-Pentacosadiynoic Acid and Their Dosimetry Applications

“… 1 , 2 It is well understood that diacetylene monomers such as PCDA can undergo a solid-state 1,4-addition polymerization reaction when exposed to heat, ultraviolet, X-ray, or γ-radiation to yield a colored polydiacetylene. 3 − 6 However, the reaction will only occur under optimal topochemical conditions—the adjacent dialkyne moieties of the monomer must be separated by a distance less than or equal to the van der Waals contact distance ( d ) of 3.8 Å, have a translational period repeat spacing ( r ) of 4.9 Å or less, and have the monomers at an orientation angle (θ) to the crystal axis close to 45° ( Scheme 1 ). 3 , 7 , 8 The X-ray structure and topochemical parameters of PCDA were recently reported.…”

“… 3 − 6 However, the reaction will only occur under optimal topochemical conditions—the adjacent dialkyne moieties of the monomer must be separated by a distance less than or equal to the van der Waals contact distance ( d ) of 3.8 Å, have a translational period repeat spacing ( r ) of 4.9 Å or less, and have the monomers at an orientation angle (θ) to the crystal axis close to 45° ( Scheme 1 ). 3 , 7 , 8 The X-ray structure and topochemical parameters of PCDA were recently reported. 3 As PCDA exhibits some photoreactivity, it has been incorporated into radiochromic films in the past (e.g., GAFchromic MD-55); 9 however, the PCDA films are relatively insensitive and can only be used to measure doses around 5 Gy.…”

“… 3 , 7 , 8 The X-ray structure and topochemical parameters of PCDA were recently reported. 3 As PCDA exhibits some photoreactivity, it has been incorporated into radiochromic films in the past (e.g., GAFchromic MD-55); 9 however, the PCDA films are relatively insensitive and can only be used to measure doses around 5 Gy. 9 , 10 More recently, sensitive self-developing films such as GAFchromicExternal Beam Therapy (EBT) have been developed by Ashland that are based on the lithium salt of PCDA (Li-PCDA) 11 − 18 and span dose ranges of 0.01–40 Gy.…”