460–800 nm for Ir-3). The kinetics of fs transient absorption (TA) reveals that the lowest singlet excited-state lifetimes of these complexes vary from 1.43 ps to 142 ps. The stronger excited-state absorption of Ir-1–Ir-3 compared to their respective ground-state absorption in the visible spectral range leads to strong reverse saturable absorption (RSA) at 532 nm for ns laser pulses. The trend of transmission
三种杂合阳离子
铱(III)配合物,它们包含环
金属化的2- [3-(7-
萘二甲
酰亚胺芴-2'-基)苯基]
吡啶配体和不同的二
亚胺(N ^ N)
配体(N ^ N =
2,2'-联吡啶(bpy,Ir-1),1,10-
菲咯啉(phen,Ir-2)和5,5'-双[7-(
苯并噻唑-2'-基)
芴2'-基] -2,2合成并表征了'-联
吡啶(BTF-bpy,Ir-3)。通过光谱方法和基于时间的密度泛函理论(TDDFT),系统地研究了这些配合物的光物理性质。所有复合物在ca处都具有很弱的电荷转移尾巴。450-570 nm;在290-350 nm和350-450 nm区域分别有两个强烈的吸收带。的发射的Ir-1-IR-3在CH 2
氯2所发出主要来自C ^ N
配体本地化3 π,π*的状态。这些发射激发态也产生宽带三重激发态吸收在可见光至近红外区域(即,为420-800纳米的Ir-1和IR-2 ,以及用于460-800纳米的Ir-3