Synthesis of Large Macrocyclic Azacalix[n]pyridines (n = 6 − 9) and Their Complexation with Fullerenes C60 and C70
摘要:
Large methylazacalix[n]pyridines (n = 6-9) were synthesized effectively from the Pd-catalyzed macrocyclic fragment coupling reactions between alpha,omega-dibrominated and alpha,omega-diaminated linear oligomers. As macrocyclic host molecules, they formed a 1:1 complex with fullerenes C-60 and C-70 with association constants ranging from 3 x 10(4) to 1 x 10(5) M-1.
Ligand-controlled phosphine-free Co(II)-catalysed cross-coupling of secondary and primary alcohols
作者:Shi-Qi Zhang、Bin Guo、Ze Xu、Hong-Xi Li、Hai-Yan Li、Jian-Ping Lang
DOI:10.1016/j.tet.2019.130640
日期:2019.11
phosphine-free N˄N˄N pincer ligands efficiently catalyze C–C coupling of secondary and primary alcohols to selectively form α-alkylated ketones with a good functional group compatibility using NaOH (20 mol%) as a base at 120 °C. The NH group on the N˄N˄N–Co(II) precatalyst controls the activity and selectivity. This simple catalytic system is involved in the synthesis of quinolones via the dehydrogenative annulation
Implementing high quantum yields and long-lived excitedstate lifetimes within heteroleptic luminescent CrIII complexes is a keystone for the design of supramolecular energy-converting devices exploiting this cheap metal. In this contribution, we discuss the stepwise and rational optimization of these two limiting factors within a series of heteroleptic CrIII complexes.
hetero‐oligonuclear metal complex architectures featuring organic ligands is an interesting but still rarely observed phenomenon, despite its great potential from a basic research and application perspective. In this context, a new photonic material consisting of molecular chromium(III) and ytterbium(III) complex ions was developed that exhibits excitation‐power density‐dependent cooperative sensitization of the chromium‐centered
以有机配体为特征的异质寡核金属配合物结构中的上转换光致发光是一种有趣但仍然很少观察到的现象,尽管从基础研究和应用的角度来看它具有巨大的潜力。在此背景下,开发了一种由分子铬(III)和镱(III)络离子组成的新型光子材料,该材料在约775 nm处表现出以铬为中心的2 E/ 2 T 1磷光的激发功率密度依赖性协同敏化在环境温度下,在固态中,在约 980 nm 处激发镱带2 F 7/2 → 2 F 5/2后。上转换过程对大气中的氧气不敏感,并且可以在晶格中存在水分子的情况下观察到。
Excited State Tuning of Bis(tridentate) Ruthenium(II) Polypyridine Chromophores by Push-Pull Effects and Bite Angle Optimization: A Comprehensive Experimental and Theoretical Study
substitution and enlarged ligand bite angles has been used in functionalized heteroleptic bis(tridentate) polypyridine complexes of ruthenium(II) to shift the 1MLCT absorption and the 3MLCT emission to lower energy, enhance the emission quantum yield, and to prolong the 3MLCT excited‐state lifetime. In these complexes, that is, [Ru(ddpd)(EtOOC‐tpy)][PF6]2, [Ru(ddpd‐NH2)(EtOOC‐tpy)][PF6]2, [Ru(ddpd)(MeOOC)3‐tpy}][PF6]2
Strongly Coupled Cyclometalated Ruthenium Triarylamine Chromophores as Sensitizers for DSSCs
作者:Christoph Kreitner、Andreas K. C. Mengel、Tae Kyung Lee、Woohyung Cho、Kookheon Char、Yong Soo Kang、Katja Heinze
DOI:10.1002/chem.201601001
日期:2016.6.20
cyclometalated bis(tridentate) ruthenium(II) triarylamine hybrids [Ru(dbp‐X)(tctpy)]2− [2 a]2−–[2c]2− (H3tctpy=2,2′;6′,2′′‐terpyridine‐4,4′,4′′‐tricarboxylic acid; dpbH=1,3‐dipyridylbenzene; X=N(4‐C6H4OMe)2 ([2 a]2−), NPh2 ([2 b]2−), N‐carbazolyl [2c]2−) was synthesized and characterized. All complexes show broad absorption bands in the range 300–700 nm with a maximum at about 545 nm. Methyl esters [Ru(Me3tctpy)(dpb‐X)]+
一系列锚固官能化的环金属化双(三齿)钌(II)三芳基胺杂化物[Ru(dbp‐X)(tctpy)] 2− [ 2 a ] 2− – [ 2 c ] 2−(H 3 tctpy = 2, 2′; 6′,2′′-叔吡啶-4,4′,4′′-三羧酸; dpbH = 1,3-二吡啶基苯; X = N(4-C 6 H 4 OMe)2([ 2 a ] 2−),NPh 2([ 2 b ] 2−),N-咔唑基[ 2 c ] 2−)进行了合成和表征。所有复合物均显示300-700 nm范围内的宽吸收带,最大吸收带约为545 nm。甲酯[Ru(Me 3 tctpy)(dpb-X)] + [ 1 a ] + – [ 1 c ] +被氧化成强耦合的混合价种[ 1 a ] 2+ – [ 1 c ] 2+和Ru III(铵)配合物[ 1 a ] 3+ – [ 1 c ] 3+在较低的氧化电位下 理论计算表明,金属中心和三芳基胺单元之间的自旋离域增加,顺序为[