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Bimetallic Platinum Group Complexes of a Macrocyclic Pyrazolate/NHC Hybrid Ligand
Organometallics ( IF 2.5 ) Pub Date : 2021-08-19 , DOI: 10.1021/acs.organomet.1c00417
Thomas Pickl 1 , Alexander Pöthig 1
Affiliation  

We present the synthesis, structural characterization, and photophysical properties of dinuclear PdII and PtII–NHC complexes Pd2L(PF6)2 and Pt2L(PF6)2 based on a macrocyclic calix[4]imidazolylidene[2]pyrazolate ligand obtained by in situ deprotonation of the tetraimidazolium salt H6L(PF6)4. The PtII congener was also prepared by transmetalation from previously published AgI pillarplex Ag8L2(PF6)4. NMR spectroscopy (1H, 13C, 195Pt) combined with SC-XRD studies elucidated the structure of the PdII and PtII complexes in the solid state and in solution. The d8 metal ions of both congeners are coordinated in a slightly distorted square-planar arrangement. Similar to the previously reported NiII complex Ni2L(PF6)2, the heavier metal homologues adopt a bent, saddle-shaped structure. As observed for structurally similar PtII complexes in solution, bimetallic Pt2L(PF6)2 showed photoluminescence in the blue region. In the solid state, emission was observed at a similar energy with unusually short lifetimes compared to other monometallic PtII complexes. DFT and TDDFT studies shed light on the nature of the most bathochromic transitions, suggesting a significant pyrazolate- and NHC-centered π–π* character.

中文翻译:

大环吡唑酯/NHC杂化配体的双金属铂族配合物

我们介绍了基于大环杯[4]咪唑亚基 [2]的双核 Pd II和 Pt II -NHC 配合物 Pd 2 L(PF 6 ) 2和 Pt 2 L(PF 6 ) 2的合成、结构表征和光物理性质通过四咪唑鎓盐H 6 L(PF 6 ) 4 的原位去质子化获得的吡唑酯配体。Pt II同源物也通过从先前公布的 Ag I柱复合 Ag 8 L 2 (PF 6 )进行金属转移制备4 . NMR 光谱(1 H, 13 C, 195 Pt)结合 SC-XRD 研究阐明了固态和溶液中Pd II和 Pt II配合物的结构。两种同系物的 d 8金属离子以略微扭曲的方形平面排列进行配位。与之前报道的 Ni II复合物 Ni 2 L(PF 6 ) 2类似,较重的金属同系物采用弯曲的马鞍形结构。正如对溶液中结构相似的 Pt II配合物所观察到的那样,双金属 Pt 2 L(PF 6 ) 2在蓝色区域显示出光致发光。在固态下,与其他单金属 Pt II配合物相比,在相似的能量下观察到发射,但寿命异常短。DFT 和 TDDFT 研究揭示了最红移转变的性质,表明显着的以吡唑酯和 NHC 为中心的 π-π* 特征。
更新日期:2021-09-13
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