A new expanded porphycene with 26 π‐electrons has been prepared by the McMurry coupling of 1,4‐bis(3,4‐diethyl‐2‐pyrryl)benzene dialdehyde. Expansion of the porphycene framework provides a ligand capable of stabilizing a bis(rhodium) and a monoruthenium complex. These new porphycene derivatives absorb strongly in the NIR spectral region, with appreciable absorptivity up to 1300 nm. On the basis of their ground‐ and excited‐state spectroscopic features and structural parameters, both the free‐base system and the bis(rhodium) complex are considered to be Hückel‐type aromatic systems. This conclusion is supported by DFT calculations.

中文翻译：

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具有高NIR吸收率的膨胀紫杉烷，可稳定两种不同类型的金属配合物

通过1,4-双（3,4-二乙基-2-吡咯基）苯二醛的McMurry偶联制备了一种新的具有26个π电子的扩展卟啉。卟啉骨架的扩展提供了能够稳定双（铑）和单钌配合物的配体。这些新的卟啉衍生物在NIR光谱区域吸收很强，吸收率高达1300 nm。根据它们的基态和激发态光谱特征和结构参数，游离碱体系和双（铑）配合物均被视为Hückel型芳族体系。该结论得到DFT计算的支持。