首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Superexchange and Dipole-Dipole Energy Transfer from the [Cr(ox)_3]~(3-) of 3D Oxalate Networks to Encapsulated [Cr(bpy)_3]~(3+)
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Superexchange and Dipole-Dipole Energy Transfer from the [Cr(ox)_3]~(3-) of 3D Oxalate Networks to Encapsulated [Cr(bpy)_3]~(3+)

机译:从3D草酸盐网络的[Cr(ox)_3]〜(3-)到封装的[Cr(bpy)_3]〜(3+)的超交换和偶极-偶极能量转移

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摘要

Electronic energy transfer from [Cr(ox)_3]~(3-) (ox = oxalate) in three-dimensional (3D) anionic oxalate networks to encapsulated [Cr(bpy)_3]~(3+) (bpy = 2,2'-bipyridine) cations at 1.5 K was investigated by time-resolved luminescence spectroscopy. Two series of mixed crystals of nominal compositions [NaAl_(1-x)Cr_x(ox)_3][Rh_(0.99)Cr_(0.01)(bpy)_3]ClO_4 (x = 0, 0.01, 0.05, 0.1, 0.2, 0.4, 0.6, 0.8, and 1) and [NaAl_(0.99)Cr_(0.01)(ox)_3][Rh_(1-y)Cr_y(bpy)_3]ClO_4 (y = 0, 0.01, 0.02, 0.03, 0.04, and 0.05) were utilized. Energy transfer from [Cr(ox)_3]~(3-) to [Cr(bpy)_3]~(3+) occurs by two mechanisms. Rapid, short-range transfer (k_(et) > 10~6 s~(-1)) is attributed to superexchange coupling between the Cr~(3+) ions via #pi# overlap of the oxalate and bipyridine ligands. In addition, at low [Cr(ox)_3]~(3-) concentrations (nominally x = 0.01) a very much slower process with a maximum k_(et) approx= 200s~(-1) is identified in the time-resolved spectra and attributed to a dipole-dipole mechanism. Furthermore, the resonant [Cr(ox)_3]~(3-) to [Cr(ox)_3]~(3-) energy migration previously reported by von Arx et al. (Phys. Rev. (1996), B54, 15800) assists [Cr(ox)_3]~(3-) to [Cr(bpy)_3]~(3+) transfer as the [Cr(ox)_3]~(3-) concentration increases.
机译:电子在三维(3D)阴离子草酸酯网络中从[Cr(ox)_3]〜(3-)(ox =草酸盐)转移到封装的[Cr(bpy)_3]〜(3+)(bpy = 2,通过时间分辨发光光谱法研究了1.5 K下的2'-联吡啶)阳离子。标称组成的两个混合晶体系列[NaAl_(1-x)Cr_x(ox)_3] [Rh_(0.99)Cr_(0.01)(bpy)_3] ClO_4(x = 0,0.01,0.05,0.1,0.2,0.4 ,0.6、0.8和1)和[NaAl_(0.99)Cr_(0.01)(ox)_3] [Rh_(1-y)Cr_y(bpy)_3] ClO_4(y = 0、0.01、0.02、0.03、0.04,和0.05)。从[Cr(ox)_3]〜(3-)到[Cr(bpy)_3]〜(3+)的能量转移通过两种机理发生。快速,短程转移(k_(et)> 10〜6 s〜(-1))归因于Cr〜(3+)离子之间通过草酸酯和联吡啶配体的#pi#重叠进行超交换偶联。此外,在低[Cr(ox)_3]〜(3-)浓度下(名义上x = 0.01),在以下时间内,最大k_(et)大约= 200s〜(-1)的过程非常慢。解析光谱,并归因于偶极-偶极子机制。此外,von Arx等人先前报道了[Cr(ox)_3]〜(3-)到[Cr(ox)_3]〜(3-)的能量迁移。 (Phys。Rev.(1996),B54,15800)协助[Cr(ox)_3]〜(3-)向[Cr(bpy)_3]〜(3+)的转移作为[Cr(ox)_3]〜 (3-)浓度增加。

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