63619-64-7Relevant academic research and scientific papers
Photoluminescent gold(I) complex with biphenyl acetylene ligand showing stable nematic liquid-crystalline phase
Sugimoto, Nana,Tamai, Sho,Fujisawa, Kaori,Tsutsumi, Osamu
, p. 97 - 106 (2014)
A novel liquid-crystalline (LC) gold(I) complex (Biph6) having biphenyl acetylene ligand was designed and synthesized, and its LC behavior and photoluminescence properties were compared with those of a previously reported gold complex (Ph6) with phenyl acetylene ligand. Biph6 exhibited an enantiotropic nematic phase in a temperature range wider than that of Ph6. Ph6 and Biph6 showed intense photoluminescence with different colors in the crystalline phase: blue and yellowish green luminescence, respectively. We demonstrated that the color of luminescence of the gold complexes could be changed by changing the structure of the molecules and molecular aggregates.
Fascinating phenomena towards single-component white-light emission through luminescent thermochromism
Hisano, Kyohei,Maruoka, Yui,Sami, Hussain,Tsutsumi, Osamu,Younis, Osama
, (2021/07/10)
Developing broad spectrum white-light emitting materials was always considered a challenge in terms of color stability and reproducibility. Here, we report the design and optical properties of two materials bearing an ethynylbiphenyl group. The two materials exhibited excellent thermal stability and showed liquid crystal (LC) behavior. Promisingly, temperature-dependent photoluminescence results demonstrated distinct thermochromic behavior which switches the emission color from deep blue in the crystal phase to white in the LC phase. It was revealed that the overall effect of the intermolecular interactions forming a new excited state in the LC phase of the ethynylbiphenyl moiety is the main cause for the white-light emission. The emission behavior of the studied materials was tuned by thermal stimuli, and the emission color was regulated by changing the aggregate structure. These present findings open a door to develop more appealing single-molecule white-light emitters.
Total synthesis and structure-activity relationships of caspofungin-like macrocyclic antifungal lipopeptides
Yao, Jianzhong,Liu, Hongming,Zhou, Ting,Chen, Hai,Miao, Zhenyuan,Dong, Guoqiang,Wang, Shengzheng,Sheng, Chunquan,Zhang, Wannian
experimental part, p. 3074 - 3085 (2012/06/01)
The echinocandins represent a well-known class of macrocyclic antifungal lipopeptides that can be used for treatment of invasive fungal infections. Due to their complex chemical structures and synthetic difficulties, the structure-activity relationships (SARs) of them are still limited. A total synthetic approach was developed to synthesize structurally diverse caspofungin-like antifungal cyclic lipopeptides, allowing for systemically investigating their SARs. Most of the designed cyclic lipopeptides showed potent antifungal activities with broad spectrum. In particular, several compounds (e.g., 30a, 30e-h, 31a-d, 32c, and 33a,b) were more active in vitro against Candida albicans or Aspergillus fumigatus than caspofungin. The findings in this work indicated that the 'left' tripeptide segment of cyclic lipopeptide scaffold might be suitable for a hydrophilic structural motif, whereas the 'right' lipotripeptide segment was preferred as a hydrophobic core. The alkoxy-naphthoyl was found to be optimal side chain and alkyl length could affect the SARs of alkoxy-aroyl side chains.
Synthesis of liquid crystal molecules based on bis(biphenyl)diacetylene and their liquid crystallinity
Uchimura, Makoto,Kang, Sungmin,Ishige, Rohei,Watanabe, Junji,Konishi, Gen-Ichi
supporting information; experimental part, p. 513 - 515 (2010/08/20)
We synthesized novel liquid crystalline molecules that contain a bis(biphenyl)diacetylene mesogen and confirmed their structures by 1HNMR, 13CNMR, and FT-IR spectroscopy and mass spectrometry. These compounds formed thermotropic liquid crystals in a wide temperature region that was well characterized by optical microscopic and X-ray measurements.
Nano-segregated polymeric film exhibiting high ionic conductivities
Kishimoto, Kenji,Suzawa, Tomoyuki,Yokota, Tomoki,Mukai, Tomohiro,Ohno, Hiroyuki,Kato, Takashi
, p. 15618 - 15623 (2007/10/03)
Nanostructures can be used for the fabrication of highly functional materials transporting ions and charges. We demonstrate a new design strategy for polymeric higher ion-conductors. Phase-segregated layers of alternating mobile tetra(ethylene oxide)s (TEOs) and rigid aromatic cores where the TEO moieties are grafted from aromatic layers have been shown to be efficient to transport lithium triflate. Such segregated structures at the nanometer scale (nano-segregated structures) were prepared by in-situ photopolymerization of an aligned methacrylate liquid crystalline monomer comprising a terphenyl rigid rod mesogen having a TEO terminal chain. The ion-conductive TEO moiety remains in the highly mobile state even after polymerization, which is indicated by its low glass transition temperature (-45 °C). This nanostructured film exhibits an ionic conductivity parallel to the layer of 10-3 S cm-1 at room temperature. The highest ionic conductivity is in the level of 10 -2 S cm-1 observed at 150 °C. The anisotropic ionic conductivities have been observed for the nano-segregated film.
Synthesis and property of liquid crystalline 4-alkoxyl-4″-cyano-p-terphenyls
Zang, Zhi-Qian,Zhang, Dong,Wan, Xin-Hua,Zhou, Qi-Feng
, p. 145 - 158 (2007/10/03)
The synthesis of some new 4-alkoxyl-4″-cyano-p-terphenyls is described. The preliminary characterization by means of polarized optical microscopy, differential scanning calorimetry and X-ray diffraction shows that all these compounds are thermotropically liquid-crystalline and can form both the nematic and smectic mesophases.
