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Monitoring Ligand Substitution in (Catalytically Active) Metal Complexes with Bodipy-Tagged Diimines and NHC Ligands
Organometallics ( IF 2.5 ) Pub Date : 2019-05-03 , DOI: 10.1021/acs.organomet.9b00130
Oliver Halter 1 , Jonas Spielmann 1 , Yuki Kanai 1 , Herbert Plenio 1
Affiliation  

The reaction of 2,6-dimethyl-4-(Bodipy-8-yl)aniline with 1,4-dioxane-2,3-diol provides the respective diimine 3, followed by ring closure with paraformaldehyde, resulting in the imidazolium salt 4·HCl containing two fluorophores. The NHC metal complexes ([IrCl(cod)(4)], [Ir(cod)(4)(py)]OTf, [IrCl(CO)2(4)], [PdCl(allyl)(4)], [PdCl2(Clpy)(4)], [AuCl(4)], and [NiCl(Cp)(4)]) were prepared. The complexes with (Au, Pd) are fluorescent. Weakly fluorescent complexes with Ir undergo fluorogenic reactions with CO and H2. The oxidative addition of H2 to [Ir(cod)(4)]OTf leads to a fluorescence gain of 8.2 and is suitable for the detection of hydrogen. Following activation of the diimine complex [PdCl(CH3)(3)] with NaBArF, the formed [Pd(CH3)(3)]BArF is a competent ethene polymerization catalyst. The addition of (pyridine, CH3CN, CO) or olefins (ethene, 1-hexene, styrene) to the activated complex results in a pronounced increase in the fluorescence because of metal–ligand interactions and the modulation of photoinduced electron transfer quenching. The fluorescence response was used for the determination of the respective association constants with the donor molecules: 1-hexene (K = 9 L·mol–1) and CH3CN (K = 4 L·mol–1); styrene is a poor ligand (K = 0.04 L·mol–1). Based on the ν(CO) of the [Mo(CO)4(3)] complex, the Bodipy-8-yl group is a moderately electron-withdrawing group, comparable to the Br substituent.

中文翻译:

使用Bodipy标记的Diimines和NHC配体监测(催化活性)金属配合物中的配体取代

2,6-二甲基-4-(Bodipy-8-基)苯胺与1,4-二恶烷-2,3-二醇的反应提供了相应的二亚胺3,然后用低聚甲醛闭环,生成了咪唑鎓盐 4 ·含两个荧光团的HCl。NHC金属络合物([IrCl(cod)(4)],[Ir(cod)(4)(py)] OTf,[IrCl(CO)24)],[PdCl(烯丙基)(4)],制备了[PdCl 2(Clpy)(4),[AuCl(4)]和[NiCl(Cp)(4)])。与(Au,Pd)的配合物是荧光的。Ir的弱荧光络合物与CO和H 2发生荧光反应。H 2在[Ir(cod)(4)] OTf上的氧化添加导致荧光增益为8.2,适用于氢的检测。用NaBArF活化二亚胺配合物[PdCl(CH 3)(3)]后,形成的[Pd(CH 3)(3)] BArF是一种有效的乙烯聚合催化剂。(吡啶,CH 3的加成CN,CO)或烯烃(乙烯,1-己烯,苯乙烯)与活化的络合物的结合会导致荧光显着增加,这是由于金属与配体之间的相互作用以及光致电子转移猝灭的调节。荧光响应用于测定与供体分子的缔合常数:1-己烯(K = 9 L·mol –1)和CH 3 CN(K = 4 L·mol –1);苯乙烯是一种不良的配体(K = 0.04 L·mol –1)。基于[Mo(CO)43)]络合物的ν(CO),Bodipy-8-基团是一个中等吸电子基团,与Br取代基相当。
更新日期:2019-05-06
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