146253-69-2Relevant articles and documents
Synthesis of cryptands having tritopic receptor sites by [2+3] Schiff base condensation using Cs(I) ion as the template
Ragunathan, Kaliappa G.,Shukla, Rameshwer,Mishra, Swati,Bharadwaj, Parimal K.
, p. 5631 - 5634 (1993)
Synthesis of two tritopic receptors L1 and L2 by [2+3] Schiff base condensation of trialdehyde 1 or 2 and 1,2-diaminobenzene followed by reduction with NaBH4 are reported. The reactions undergo smoothly in presence of Cs(I) ion as th
Complexation properties of a heteroditopic cryptand towards CuII and NiII, crystal structures of the cryptand and its nickel(II) cascade complex
Ghosh, Pradyut,Gupta, Sayam Sen,Bharadwaj, Parimal K.
, p. 935 - 938 (1997)
The crystal structure of the heteroditopic cryptand (L) formed by Schiff-base condensation of tris(2-aminoethyl)amine and 2,2′,2″-nitrilotris(ethyIeneoxy)tris(benzaldehyde) followed by reduction with NaBH4 has been determined. The molecule has an endo-endo conformation with a pseudo-three-fold symmetry axis passing through the two bridgehead nitrogens. This symmetry is maintained in chloroform solution as indicated by its 1H NMR spectrum. The cryptand accepts a metal ion (CuII, ZnII or NiII) inside the cavity forming mononuclear cryptates of general formula [ML][ClO4]2. The metal ion occupies the N4 end of the cavity. The light blue CuN4 chromophore thus formed exhibits an axial EPR spectrum with very small A∥ value (63 × 10-4 cm-1) and a low-energy ligand-field band. Nickel(II) initially forms a blue [NiL][ClO4]2 complex which on dissolving in moist MeCN solution crystallizes as purple rectangular parallelepipeds with the formulation [NiL(H2O)(MeCN)][ClO4]2·H 2O·2MeCN. The crystal structure of this complex has also been determined. The NiII ion is octahedrally co-ordinated with the equatorial sites occupied by the three secondary amino N atoms of the cryptand and the N atom of the bound MeCN. The axial sites are occupied by the bridgehead N and the O atom of the water molecule which enters the cavity forming a cascade complex.
Template Synthesis of a Cryptand with Hetero-Ditopic Receptor Sites
Kaliappa, G. Ragunathan,Bharadwaj, Parimal K.
, p. 7581 - 7584 (1992)
The cryptand 2 forms exclusively in 70percent yield via tripod-tripod Schiff base condensation of tris(2-aminoethyl)amine and trialdehyde 1 in presence of Cs+ ion followed by reduction with NaBH4.
Single chemosensor for sensing multiple analytes: Selective fluorogenic detection of Cu2+ and Br?
Ko, Yoon Gun,Mayank,Singh, Narinder,Jang, Doo Ok
, p. 3839 - 3844 (2018)
A tripodal receptor R1 with a combination of nitrogen and oxygen-based binding sites was designed and used for the selective determination of Cu2+. The fluorescence emission profile of R1 in the presence of Cu2+ showed a marked enhancement in fluorescence intensity, indicating high selectivity among other metal ions. The R1–Cu2+ complex was further explored as a sensor for anion detection. Upon addition of Br?, switching to a fluorescence “off” state was observed. The Br? selectivity of the complex over a wide range of concentrations was observed via titrimetric analysis through changes in the emission spectra.
Toward dynamic combinatorial libraries of cryptands
Ziach, Krzysztof,Ceborska, Magdalena,Jurczak, Janusz
supporting information; experimental part, p. 4452 - 4455 (2011/09/19)
The first examples of dynamic combinatorial libraries of cryptands, created using the chemistry of imines is presented. Experiments, in which two trialdehydes compete for one triamine in a small library, show the full reversibility of cryptand formation,
Novel hydrazone-based tripodal sensors: Single selective colorimetric chemosensor for acetate in aqueous solution
Zhang, Youming,Li, Qiao,Zhang, Qinsheng,Lin, Qi,Cao, Cheng,Liu, Mingxia,Wei, Taibao
scheme or table, p. 1529 - 1534 (2011/11/07)
A series of novel tripodal colorimetric anion sensors based on hydrazone CH=N - NH groups have been synthesized and their recognition behavior with anionic guests has been studied. In DMSO solutions, sensors 1 and 2 show colorimetric responses for F-
Ratiometric fluorescent determination of Zn(II): A new class of tripodal receptor using mixed imine and amide linkages
Lee, Doo Youn,Singh, Narinder,Kim, Min Joung,Jang, Doo Ok
scheme or table, p. 7965 - 7969 (2010/10/19)
We synthesized a novel receptor with a unique combination of sp2 nitrogen (-CH=N-) and carbonyl groups from amide linkages. These two moieties are judiciously incorporated into the receptor design such that these sites simultaneous binding a metal ion may generate a stable five-member ring. The receptor has been used to selectively detect Zn2+ through changes in the fluorescence spectra. Upon Zn2+ binding with the receptor, the fluorescence band shifted to enhance fluorescence intensity, allowing ratiometric determination of Zn2+ concentration.
Thiosemicarbazonates of silver(I): Synthesis, spectroscopy and reactivity towards triphenylphosphine
Lobana, Tarlok S.,Bhargava, Gaurav,Sharma, Vinay,Kumar, Manoj
, p. 309 - 312 (2007/10/03)
The new tripodal ligand tris-[{2-benzaldehyde}-oxoethyl}amine]-thiosemicarbazone, N[CH2-CH2-O-{o-C6H4- CH=N-NH-C(=S)-NH2}}3 (abbreviated as H3L) on reaction with silver(I) acetate in 3:1 (M:L) mol ratio in ethanol forms {Ag5L(OAc)2} (1). which in presence of excess triphenylphosphine (PPh3) in chloroform-ethanol mixture yield. {Ag5L(OAc)2(PPh3)12}(2) (L is deprotonated). Similarly, reactions of silver(I) acetate with salicylaldehyde thiosemicarbazone (H2stsc), furan-2-carbaldehyde thiosemicarbazone (Hftsc) and pyrrole-2-carbaldehyde thiosemicarbazone (Hptsc) in presence of PPh3 in ethanol-chloroform form [AgL(PPh3)n] complexes (3-5)[L (n) = Hstsc (3): ftsc (4); ptsc (5): thiosemicarbazones are monodeprolonated]. The complexes (1-5) have been characterised by their physical properties, analytical data, IR and UV spectroscopic studies.
