Long-Lived Room Temperature Deep-Red/Near-IR Emissive Intraligand Triplet Excited State (<sup>3</sup>IL) of Naphthalimide in Cyclometalated Platinum(II) Complexes and Its Application in Upconversion
作者:Wenting Wu、Huimin Guo、Wanhua Wu、Shaomin Ji、Jianzhang Zhao
DOI:10.1021/ic201254w
日期:2011.11.21
the T1 excited states of Pt-2, Pt-3, and Pt-4. The complexes were used as triplet sensitizers for triplet–triplet-annihilation (TTA) based upconversion, and the results show that Pt-3 is an efficient sensitizer with an upconversion quantum yield of up to 14.1%, despite its low phosphorescence quantum yield of 5.2%. Thus, we propose that the sensitizer molecules at the triplet excited state that are
[C ∧ NPT(acac)]的(C ∧ N =环金属配体; ACAC =乙酰丙酮),其中萘二甲酰亚胺(NI)部分直接环金属复合物(NI作为C-铂键的C-供体)的合成。用4-吡唑基萘二甲酰亚胺,获得具有五元(Pt-2)和六元(Pt-3)螯合环的异构体。用4-吡啶基萘二甲酰亚胺,仅分离出具有五元螯合环(Pt-4)的配合物。制备了以1-苯基吡唑为C∧N配体的模型配合物(Pt-1)。对Pt-3的可见光具有很强的吸收能力(在443 nm处,ε= 21 900 M –1 cm –1)和室温(RT)的磷光在630 nm(Pt-2和Pt-3)或674 nm(Pt-4)处观察到。观察到用于长寿命phosphorescences的Pt-2(τ P = 12.8微秒)和铂- 3(τ P = 61.9微秒)。Pt-1在溶液中在室温下是非磷光的,这是由于acac定位的T 1激发态[基于密度泛函理论(DFT)计算和自旋密度分析],但是在77