N
‐Methyl‐4,4′‐bipyridinium and
N
‐Methyl‐
N′
‐oxide‐4,4′‐bipyridinium Bismuth Complexes – Photochromism and Photoluminescence in the Solid State
摘要:
AbstractThree bismuth complexes based on N‐methyl‐4,4′‐bipyridinium (hMV+), (hMV)[Bi(hMV)Cl5] (1), and N‐methyl‐N′‐oxide‐4,4′‐bipyridinium (MVO+), [Bi(MVO)X4(dmso)]·dmso [X = Cl (2), Br (3)], are reported. All three compounds show luminescence in the solid state with maxima at 545 nm (yellow for 1) and 560 nm (orange for 2 and 3) with quantum yields up to 10 %. Upon UV irradiation, 1 undergoes a color change from white to blue accompanied by a reduction of the photoluminescence intensity. The analysis of the crystal structure of the three complexes points to a photoinduced charge‐transfer (PICT) process at the origin of the photochromism in 1.
cetylene. It has been revealed that the fundamental electrochemical properties are affected mostly by the water-solubility and chemical stability of the particular redox forms. Based on the systematically evolved azinium structure and gathered electrochemical data, structure–property relationships were thoroughly elucidated. Further investigation on flow battery cells identified that the known 4,4′-bipyridinium
<i>N</i>
‐Methyl‐4,4′‐bipyridinium and
<i>N</i>
‐Methyl‐
<i>N′</i>
‐oxide‐4,4′‐bipyridinium Bismuth Complexes – Photochromism and Photoluminescence in the Solid State
作者:Oksana Toma、Nicolas Mercier、Chiara Botta
DOI:10.1002/ejic.201201233
日期:2013.3
AbstractThree bismuth complexes based on N‐methyl‐4,4′‐bipyridinium (hMV+), (hMV)[Bi(hMV)Cl5] (1), and N‐methyl‐N′‐oxide‐4,4′‐bipyridinium (MVO+), [Bi(MVO)X4(dmso)]·dmso [X = Cl (2), Br (3)], are reported. All three compounds show luminescence in the solid state with maxima at 545 nm (yellow for 1) and 560 nm (orange for 2 and 3) with quantum yields up to 10 %. Upon UV irradiation, 1 undergoes a color change from white to blue accompanied by a reduction of the photoluminescence intensity. The analysis of the crystal structure of the three complexes points to a photoinduced charge‐transfer (PICT) process at the origin of the photochromism in 1.