138432-99-2Relevant articles and documents
A novel strategy for the design of smart supramolecular gels: Controlling stimuli-response properties through competitive coordination of two different metal ions
Lin, Qi,Sun, Bin,Yang, Qing-Ping,Fu, Yong-Peng,Zhu, Xin,Zhang, You-Ming,Wei, Tai-Bao
, p. 10669 - 10671 (2014)
By rationally introducing Ca2+ and Fe3+ into a supramolecular gel, a bimetal-gel CaFeG was prepared. CaFeG could reversibly "turn-on" its fluorescence upon sensing H2PO 4- with specific selectivity un
A sensitive and selective sensor for picric acid detection with a fluorescence switching response
Nath, Subrata,Pathak, Suraj Kumar,Pradhan, Balaram,Gupta, Ravindra Kumar,Reddy, K. Anki,Krishnamoorthy,Achalkumar, Ammathnadu S.
, p. 5382 - 5394 (2018)
A low molecular weight organogelator containing 3,5-substituted-1,3,4-oxadiazole and tetrazole units was synthesized and characterized. This compound is only soluble in DMSO and forms a stable gel. The solution and gel exhibit a blue light emission. The gel was characterized by atomic force microscopy, field-emission scanning electron microscopy, 1H NMR and fluorescence measurements. The gel to solution interconversion was reversible for many cycles of heating and cooling. The compound in solution exhibited a high selectivity for the detection of picric acid, a common explosive and water pollutant. Fluorimetric titration studies with nitro explosive compounds revealed that the emission of the compound was red shifted in response to the addition of picric acid, and exhibited a shifting of fluorescence from blue to green. Theoretical and experimental studies revealed that the sensing is due to the complexation of the picrate anion with the protonated fluorophore. The shifting of emission in response to picric acid in the visible region is ideal for the naked eye detection of explosives and therefore it is promising in comparison to the detection methods based on fluorescence quenching.
Double metal ions competitively control the guest-sensing process: A facile approach to stimuli-responsive supramolecular gels
Lin, Qi,Sun, Bin,Yang, Qing-Ping,Fu, Yong-Peng,Zhu, Xin,Wei, Tai-Bao,Zhang, You-Ming
, p. 11457 - 11462 (2014)
A facile approach to the design of stimuli-responsive supramolecular gels (SRSGs) termed double-metal-ion competitive coordination control is reported. By this means, the fluorescence signals and guest-selective responsiveness of the SRSGs are controlled
A novel highly selective "turn-on" fluorescence sensor for silver ions based on Schiff base
Lin, Qi,Yang, Qingping,Sun, Bin,Wei, Taibao,Zhang, Youming
, p. 1255 - 1258 (2014)
A novel optical chemical sensor L was designed and synthesized for the determination of silver ions. The sensor L was derived from 1-naphthaldehyde and 3,4,5-tris(hexadecyloxy)benzohydrazide. The sensor L shows high sensitivity and selectivity for Ag+ det
An efficient iodide ion chemosensor and a rewritable dual-channel security display material based on an ion responsive supramolecular gel
Lin, Qi,Liu, Lu,Liu, Juan,Zheng, Feng,Zhang, You-Ming,Yao, Hong,Wei, Tai-Bao
, p. 38210 - 38215 (2017)
By introducing multi-self-assembly driving forces, coordination binding sites and signal groups into the same molecule, a well designed functional gelator G1 was synthesized. The gelator G1 could form a stable Pb2+-coordinated supramolecular me
Exceptional dual fluorescent, excited-state intramolecular proton-transfer (ESIPT) columnar liquid crystals characterized by J-stacking and large Stokes shifts
Kanakala, Madhu Babu,Yelamaggad, Channabasaveshwar V.
, (2021/03/19)
Excited-State Intramolecular Proton-Transfer (ESIPT) fluorophores are emerging as promising future materials for electronic and biotechnological applications. ESIPT columnar (Col) liquid crystals (LCs) have been especially projected as the apt materials for advanced technological endeavors. But, there are hardly any explorations in this direction and thus, needing immediate attention. Herein we report on the synthesis, characterization, and ESIPT activity of a homologous series of novel phasmidic bis(N-salicylideneaniline) Col LCs. Optical microscopic, calorimetric and powder X-ray diffraction (XRD) studies evidence the occurrence of hexagonal columnar (Colh) phase having p6mm symmetry where the constituent slices result from the self-assembly of a pair of mesogens in a side-by-side manner facilitated by intense longitudinal π-π interactions. X-ray data confirm the absence of both directionally correlated tilting of the slices and transverse core-core interactions within the columns. Fluorescence probing clearly evidence the ESIPT occurring not only in DCM solution of the mesogens but also in their three-condensed states viz., solid, liquid crystal, and isotropic liquid phase; in general, two archetypal emission bands at ~430 nm (weak) and ~ 630 nm (strong) with large Stokes shifts (250–275 nm) of ESIPT phenomenon have been observed. The slow shift of emission maxima of the ESIPT fluorescence as a function of decreasing temperature without photoluminescence quenching coupled with the estimated tilt angle (?) of the slices normal to the columnar axis (37 to 42o), from the XRD data, confirm the formation of so-called Scheibe or J-aggregates. The redox activity, metal ion sensing ability, and solvatochromism of the mesogens have also been investigated. The study suggests that these ESIPT Col LCs with band-gap of about 3 eV can be regarded as wide-bandgap semiconducting materials having the electronic characteristics falling between those of conventional semiconductors and insulators.
Columnar self-assembly of luminescent bent-shaped hexacatenars with a central pyridine core connected with substituted 1,3,4-oxadiazole and thiadiazoles
Pradhan, Balaram,Gupta, Ravindra Kumar,Pathak, Suraj Kumar,De, Joydip,Pal, Santanu Kumar,Achalkumar, Ammathnadu S.
, p. 3781 - 3798 (2018/03/06)
Bent-shaped molecules with a central pyridine core flanked with substituted 1,3,4-oxadiazole and thiadiazole derivatives with a variation in the number and length of terminal tails were synthesized. Thiadiazole based compounds exhibited a wider mesophase
Wide-Range Columnar and Lamellar Photoluminescent Liquid-Crystalline Lanthanide Complexes with Mesogenic 4-Pyridone Derivatives
Chiriac, Laura F.,Pasuk, Iuliana,Secu, Mihail,Micutz, Marin,C?rcu, Viorel
, p. 13512 - 13522 (2018/09/06)
A series of liquid crystals with various lanthanide ions (EuIII, SmIII, and TbIII) was designed and prepared starting from the corresponding lanthanide nitrates and N-alkylated 4-pyridone derivatives bearing mesogenic 3,4,
Multifunctional hexacatenar mesogen exhibiting supergelation, AIEE and its ability as a potential volatile acid sensor
Pradhan, Balaram,Gupta, Monika,Pal, Santanu Kumar,Achalkumar, Ammathnadu S.
supporting information, p. 9669 - 9673 (2016/11/02)
A bent shaped hexacatenar mesogen self-assembling into a columnar phase, in liquid crystalline and gel states exhibiting aggregation induced enhanced blue light emission has been synthesized. Its ability to detect volatile acids is demonstrated.
Photoluminescent discotic liquid crystals derived from tris(N-salicylideneaniline) and stilbene conjugates: Structure-property correlations
Achalkumar, Ammathnadu S.,Veerabhadraswamy,Hiremath, Uma S.,Rao, Doddamane S. Shankar,Prasad, Subbarao Krishna,Yelamaggad, Channabasaveshwar V.
, p. 291 - 305 (2016/05/24)
Luminescent discotic liquid crystals based on tris(N-salicylideneaniline)s [TSANs] bearing trans-stilbene fluorophores have been synthesized. Their mesomorphic and photophysical properties were studied. These TSANs existing in the form of C3h and Cs geometrical isomers of the keto-enamine tautomer self-assemble to form the columnar phase and exhibit fluorescence both in solution and mesophase states. These columnar mesophases also exhibit frozen (glassy) columnar phase, which ensures preserved fluorescence intensity, defect free alignment and simultaneous restriction on the motion of ionic impurities. These features make them promising candidates for the use in organic light emitting diodes, particularly as emissive layers. This study also led to an understanding about the dependence of their mesomorphism (mesophase type, stability and thermal range) and photophysical features on the number and pattern of their peripheral substitution, in comparison to the analogous columnar liquid crystalline TSANs reported earlier.
