Synthesis and photophysics of reverse saturable absorbing heteroleptic iridium(<scp>iii</scp>) complexes bearing 2-(7-R-fluoren-2′-yl)pyridine ligands
作者:Yuhao Li、Naveen Dandu、Rui Liu、Svetlana Kilina、Wenfang Sun
DOI:10.1039/c3dt52184b
日期:——
3 likely exhibit 3MLCT/3LLCT dominated emission in toluene solution. All complexes possess relatively strong triplet transient absorption (TA) from visible to NIR region, where reverse saturable absorption (RSA) could occur. Nonlinear transmission experiments at 532 nm using ns laser pulses demonstrate that all three complexes exhibit strong RSA, with the RSA strength following this trend: 1 > 3 > 2
三种新型的具有5,5'-双(7-苯并噻唑基芴-2'-基)-2,2'-联吡啶(N ^ N)和2-(7-R )的杂阳离子阳离子铱(III)配合物(1-3)合成并表征了-芴-2'-基)吡啶(R = H,萘二甲酰亚胺,NPh 2)(C ^ N)配体。通过紫外可见吸收,发射和瞬态吸收光谱系统研究了它们的光物理性质,并通过时变密度泛函理论(TDDFT)模拟了紫外可见吸收光谱。所有配合物表现出配体为中心的1个π,π*与来自次要贡献跃迁1个ILCT(intraligand电荷转移,π(benzothiazolylfluorene)→π *(BPY))和1MLCT(金属到配体的电荷转移,dπ(Ir)→π *(bpy))跃迁在475 nm以下,并且非常弱的1,3 MLCT和1,3 LLCT(配体到配体的电荷转移,π(C ^ N)→π *(bpy))在475 nm以上跃迁。配合物1-3在流体溶液是弱发射性在室温