31301-27-6Relevant academic research and scientific papers
A green-emitting iridium complex used for sensitizing europium ion with high quantum yield
Jiang, Weili,Hong, Chenming,Wei, Huibo,Wu, Zongkai,Bian, Zuqiang,Huang, Chunhui
, p. 124 - 130 (2017)
A green-emitting iridium(III) complex Ir(dfppy)2(cbphen) (dfppy?=?2-(4′,6′-difluoro-phenyl)pyridine, cbphen?=?4-carboxylate-phenanthroline) was synthesized and fully characterized. The single crystal data confirm its Ir(C^N)2(N^N) structure with the carboxylate group on phenanthroline stretching freely which could be able to combine with europium(III) ion. The complex was reacted with EuCl3·6H2O and Eu(TTA)3·2H2O to provide bimetallic complexes. Through photophysical studies, characteristic emission from EuIIIion was obtained, and meanwhile the green emission from iridium(III) center was almost quenched completely, suggesting this iridium(III) complex is a good sensitizer for EuIIIions. It is well worth noticing that by introducing the iridium(III) complex as a chromophore, the excitation wavelength of EuIIIion has been extended to the visible range (470?nm). Besides, due to the efficient energy transfer, the quantum yield of Ir3-Eu was nearly equal to that of Eu(TTA)3·2H2O.
Cu(ii) templated formation of [: N] pseudorotaxanes (n = 2, 3, 4) using a tris-amino ether macrocyclic wheel and multidentate axles
Bej, Somnath,Nandi, Mandira,Ghosh, Tamal Kanti,Ghosh, Pradyut
, p. 6853 - 6862 (2019)
A tris-amine and oxy-ether functionalised macrocyclic wheel (NaphMC) and various phenanthroline based multidentate axles (L1, L2 and L3) are utilised for the formation of [n]pseudorotaxanes (n = 2, 3, 4) in high yields via Cu(ii) temptation and π-π stacking interactions. The systematic development of threaded supramolecular architectures i.e. [2]pseudorotaxane {[2]CuPR(ClO4)2}, [3]pseudorotaxane {[3]CuPR(ClO4)4} and [4]pseudorotaxane {[4]CuPR(ClO4)6} from bidentate L1, linear tetradentate L2 and tripodal hexadentate L3 respectively is described. All the [n]pseudorotaxanes are well characterized by several spectroscopy and other experimental techniques such as electrospray ionization mass spectrometry (ESI-MS), isothermal titration calorimetric (ITC) study, UV/Vis, EPR, IR and elemental analysis. Moreover, the single crystal X-ray analysis of [2]pseudorotaxane confirmed the threading of L1 in the cavity of NaphMC, resulting in the formation of a penta-coordinated Cu(ii) ternary complex. ITC studies revealed the order of binding constant values for the formation of [n]pseudorotaxanes from the NaphMC-Cu(ii) complex and multidentate axles as L3 > L2 > L1. Finally, we have also shown the ability of Ni(ii) to act as a metal template in the formation of [n]pseudorotaxanes.
