Synthesis and characterization of phosphorescent cyclometalated Ir and Pt heteroleptic complexes using cyclophane-based chelates
作者:B.K. Thilini Batagoda、Peter I. Djurovich、Stefan Bräse、Mark E. Thompson
DOI:10.1016/j.poly.2016.04.039
日期:2016.9
racemates due to the planar chirality of the cyclophane ring system. Two diastereomers of (pCpz)2Ir(acac), one with C1 symmetry (ΛRS, ΔSR) and the other with C2 symmetry (ΛRR, ΔSS) were isolated, whereas only one C1 diastereomer was obtained for (pCpy)2Ir(acac). Inherent strain in the cyclophane core and transannular interaction between the bridged phenyl rings leads to a 250–400 mV cathodic shift in the
摘要报道了一系列含有环烷取代的螯合物的中性环金属化的Pt(II)和Ir(III)杂配物的合成与表征。该配合物的通式为(C ^ N)Pt(O ^ O)或(C ^ N)2Ir(O ^ O),其中C ^ N为单阴离子环烷配体2-([[2.2]-对环环-4- yl)吡啶基(pCpy)或1-([2.2]-对环烷-4-基)吡唑基(pCpz),(O 2 O)是辅助配体;乙酰丙酮酸(acac)或二甲苯基甲烷(dpm)。由于环烷环系统的平面手性,获得了pCpyH和pCpzH配体前体为外消旋体。分离了(pCpz)2Ir(acac)的两个非对映异构体,一个具有C1对称性(ΛRS,ΔSR),另一个具有C2对称性(ΛRR,ΔSS),而对于(pCpy)2Ir(acac)仅获得一个C1非对映体。相对于与ppy或ppz配体的类似络合物,环烷核的固有应变和桥联苯环之间的跨环相互作用导致氧化电位发生250-400 mV阴极移