Absorption and emission spectra of tris(2,3-diamino-2,3-dimethylbutane) Chromium(III)
作者:Stephan Brönnimann、Arne Zilian、Hans U. Güdel、Andreas Ludi
DOI:10.1016/s0020-1693(00)80208-x
日期:1990.7
Abstract The chromium(III) complex with the chelating diamine 2,3-diamino-2,3-dimethylbutane (tmen) is prepared by prolonged refluxing of anhydrous CrCl 3 with tmen in tetrahydrofurane. Compared to the parent Cr(en) 3 3+ species the absorption bands of the novel Cr(tmen) 3 3+ are red shifted and more intense with maxima at 376 and 504 nm and extinction coefficients of 140 and 154 M −1 cm −1 , respectively
摘要通过将无水CrCl 3与tmen在四氢呋喃中长时间回流,制得了具有螯合二胺2,3-二氨基-2,3-二甲基丁烷(tmen)的铬(III)配合物。与母体Cr(en)3 3+相比,新型Cr(tmen)3 3+的吸收带发生红移,并且吸收带更强,最大值在376和504 nm处,消光系数分别为140和154 M -1 cm-分别为1。在684 nm处观察到第三种非常弱的吸收(ϵ〜1 M -1 cm -1)。低温发光归因于2 E→4 A 2跃迁,并且与抗衡离子有关:氯化物,硝酸盐和三氟甲磺酸盐表现出相当宽的发射;硫酸根,四氟硼酸根和Cr(III)掺杂的Rh(tmen)3-(BF 4)3显示出很好分辨的一系列非常窄的信号。