Syntheses of C1-symmetric bidentate ligands having pyridyl and 1,3-Thiazolyl, 1-methylimidazolyl or pyrazinyl donor groups for enantioselective palladium-catalyzed allylic substitution and copper-catalyzed cyclopropanation
New chiral C1-symmetric bidentate ligands, which possess two different nitrogen heterocycles, 1,3-thiazolyl, 1-methylimidazolyl or pyrazinyl and one pyridyl group, were prepared by Kröhnke condensation in 36–59% overall yield. Stable Pd(II)-allyl and Cu(II) chloride complexes formed by some of the ligands were obtained in 60–65% yields. X-raycrystalstructure analysis of a copper(II) complex having
Platinum and palladium complexes of tridentate −C^N^N (phen-ide)-pyridine-thiazol ligands – A case study involving spectroelectrochemistry, photoluminescence spectroscopy and TD-DFT calculations
作者:Maren Krause、René von der Stück、Dana Brünink、Stefan Buss、Nikos L. Doltsinis、Cristian A. Strassert、Axel Klein
DOI:10.1016/j.ica.2020.120093
日期:2021.4
Four Pd(II) and Pt(II) complexes [M(C^N^N)Cl] (HC^N^N = 2-(6-phenylpyridin-2-yl)thiazoles) were synthesised, analysed and characterised using 1H NMR and MS in solution, as well as single crystal XRD in the solid. Cyclic voltammetry of the square planar complexes showed reversible or partially reversible reductions and irreversible oxidations. DFT calculations allowed assigning them to essentially metal-centred
合成了四种Pd(II)和Pt(II)配合物[M(C ^ N ^ N)Cl](HC ^ N ^ N = 2-(6-苯基吡啶-2--2-基)噻唑),分析和表征,方法1溶液中的1 H NMR和MS,以及固体中的单晶XRD。方形平面络合物的循环伏安法显示可逆或部分可逆的还原和不可逆的氧化。DFT计算允许将它们分配给基本上以金属为中心的氧化和以配体为中心的还原。配合物的吸收光谱在紫外到可见光谱范围内显示出强烈的吸收带,转变为π-π*状态,而长波长波段则被赋予过渡成混合的金属到配体电荷转移(MLCT)/π-π*状态,基于TD-DFT计算。Pt和Pd衍生物的比较表明,Pd的(MLCT)/π-π*能带比Pt增大。在77 K的磷光下也观察到了这一点,这归因于Pd的较高氧化电位,并由光谱电化学测量支持。光致发光量子产率(Φ大号)选自Pt急剧下降到钯在室温下,其中仅在两个铂(II)配合物是示出从一个广阔的非结构化磷光发光3
Luminescent Pd(II) Complexes with Tridentate
<sup>−</sup>
Aryl‐pyridine‐(benzo)thiazole Ligands
作者:René Stück、Maren Krause、Dana Brünink、Stefan Buss、Nikos L. Doltsinis、Cristian A. Strassert、Axel Klein
DOI:10.1002/zaac.202100278
日期:2022.1.14
Cyclometalated Pd(II) complexes generally show inferior luminescence properties compared with their Pt(II) analogues. The established approach employing tridentate cyclometalating ligands has allowed us to create a series of square planar Pd(II) complexes [Pd( )X] from their protoligands H (2-(6-phenylpyridin-2-yl)thiazoles and -benzothiazoles; coligands X=Cl, Br, I) with extensive variations at the
Isoelectronic Pt(<scp>ii</scp>) complexes of cyclometalating C^N^N ligands with phenyl/(benzo)thiophenyl and pyridyl/(benzo)thiazolyl moieties
作者:Maren Krause、Joshua Friedel、Stefan Buss、Dana Brünink、Annemarie Berger、Cristian A. Strassert、Nikos L. Doltsinis、Axel Klein
DOI:10.1039/d2dt02688k
日期:——
parts of the C^N^N ligand) and LLCT (π–π*, between the individual parts of the C^N^N ligand + X–π* from coligand to C^N^N) contributions for the ligand-centred states as well as MLCT (dPt-to-π*C^N^N) and LMCT (pCl or πCCR-to-dPt) character for the charge-transfer states involving the metal is beneficial to assess the participation of the individual heteroaryl groups of the C^N^N ligands. In view of
一系列环金属化 Pt( II ) 配合物 [Pt(C^N^N)X] (X = Cl, C CPh, C CC 6 F 5 ) 由含有苯基 (ph) 的原始配体 HC^N^N 合成, 萘基 (na) 或 (苯并) 噻吩基 (b(th)) C芳基官能团和吡啶基 (py) 或 (苯并) 噻唑基 ((b)tz)外围N单元,以及中心 4-苯基-吡啶基 (ppy) ) 或t Bu 2 -苯基-吡啶基 (tbppy) N基团。取决于外围N或C芳基的组合积木,这些方形平面配合物显示出非常不同的电化学、紫外-可见吸收和发射行为。可逆还原沿系列 th/py < ph/tz ≈ th/tz < ph/btz 向阳极移动,而不可逆氧化沿系列 Cl ≈ C CC 6 F 5 < C CPh 向阴极移动。对于长波长紫外可见吸收和光致发光特性,观察到类似的趋势。在 CH 2 Cl 2溶液中 298 K 时的最大发射范围为