Room-temperature synthesis of cyclometalated iridium(iii) complexes: kinetic isomers and reactive functionalities
作者:Ayan Maity、Bryce Lane Anderson、Nihal Deligonul、Thomas G. Gray
DOI:10.1039/c2sc21831c
日期:——
broadens the reaction's scope. Complexes of chelated ketone, aldehyde, and alcohol complexes are reported that bind iridium through formally neutral oxygen and formally anionic carbon. The new complexes luminesce with microsecond-scale lifetimes at 77 K and nanosecond-scale lifetimes at room temperature; emission quenches in air. Two complexes, an aldehyde and its reduced (alcohol) derivative, are crystallographically
环金属化铱(III)配合物已通过碱辅助的顺式-双(水基)铱(III)配合物与硼化芳族配体的碱辅助金属转移反应制备出高产率。反应在室温下进行。氢氧化钾 和 磷酸钾是有效的支持基础。由于新技术的温和性,动力学,子午线异构体被分离出来。合成速度更快酸值,但较温和的碱K 3 PO 4扩大了反应的范围。据报道,螯合的酮,醛和醇配合物的配合物通过形式上中性的氧和形式上的阴离子碳结合铱。新的配合物具有77 K的微秒级寿命和室温下的纳秒级寿命。排放物在空气中淬灭。在晶体学上表征了两种络合物,即醛及其还原的(醇)衍生物。通过密度泛函理论计算研究了它们的键合。随时间变化的计算表明,这些配合物的弗兰克-康登三重态具有混合的轨道亲子关系,这是由于通过构型相互作用混合在一起的单粒子跃迁引起的。
Rh-Catalyzed <i>Ortho</i>-Selective C–H Borylation of <i>N</i>-Functionalized Arenes with Silica-Supported Bridgehead Monophosphine Ligands
Supported phosphine-Rh systems, prepared in situ from silica-supported bridgehead monophosphines and [Rh(OH)(cod)]2, have enabled ortho-selective C-H borylation for a range of arenes containing nitrogen-based directing groups. The regioselectivity was excellent with various N-directing groups, including saturated and unsaturated N-heterocycles, tert-aminoalkyl groups, and iminetype C-N double bonds. The reaction showed significant tolerance toward steric repulsion around the reacting C-H bond. This Rh catalysis complements the Jr-catalyzed orthoborylation, which is effective for arenes with oxygen-based directing groups.
Photo-Induced <i>ortho</i>-C–H Borylation of Arenes through In Situ Generation of Rhodium(II) Ate Complexes
作者:Jin Tanaka、Yuki Nagashima、Antônio Junio Araujo Dias、Ken Tanaka
DOI:10.1021/jacs.1c05859
日期:2021.8.4
Photoinduced in situ “oxidation” of half-sandwich metal complexes to “high-valent” cationic metal complexes has been used to accelerate catalytic reactions. Here, we report the unprecedented photoinduced in situ “reduction” of half-sandwich metal [Rh(III)] complexes to “low-valent” anionic metal [Rh(II)] ate complexes, which facilitate ligand exchange with electron-deficient elements (diboron). This