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cis‐Linked cyclotetraphenylene dimer [2]c‐CTPE and trimer [3]c‐CTPE were synthesized via Pt‐mediated cyclization of cis‐diboronated tetraphenylethene. The structure of [2]c‐CTPE has been confirmed by single crystal X‐ray diffraction. The strain energy of [2]c‐CTPE and [3]c‐CTPE was calculated to be 86.28 ⋅ kJ mol−1 and 9.23 kJ ⋅ mol−1, respectively. [2]c‐CTPE and [3]c‐CTPE are typical AIEgens and show mechanofluorochromic properties. The comparisons of cis‐linked cyclotetraphenylenes with gem‐linked cyclotetraphenylenes were also discussed. [ABSTRACT FROM AUTHOR]

We report the synthesis, characterization, and reactivities of two stable NiIII N‐confused porphyrin (NCP) complexes. Metalation of 3‐OEt NCP 1 with NiCl2 ⋅ 6H2O in CHCl3/EtOH gave 3‐OEt NiII NCP 3 initially, which was easily oxidized in air to form the NiIII complex of NCP inner C‐oxide 4. Bis‐ethoxy‐modified NiIII complex 5 was synthesized by oxidation of 3 with PIFA in ethanol and CHCl3. The structures of 4 and 5 were determined by single‐crystal X‐ray diffraction analysis. An unusually long NiIII−C bond (2.170(9) Å) was observed in 4. The g‐factor (g>2.1) observed in the EPR spectra of 4 and 5 further confirmed that they are paramagnetic NiIII complexes. Comparative experiments showed that the 3‐ethoxy group plays an important role in the formation of 4 and 5. Reduction of 4 and 5 with NaBH4 regenerated complex 3. [ABSTRACT FROM AUTHOR]

We report the synthesis, characterization, and reactivities of two stable Ni III N-confused porphyrin (NCP) complexes. Metalation of 3-OEt NCP 1 with NiCl 2  ⋅ 6H 2 O in CHCl 3 /EtOH gave 3-OEt Ni II NCP 3 initially, which was easily oxidized in air to form the Ni III complex of NCP inner C-oxide 4. Bis-ethoxy-modified Ni III complex 5 was synthesized by oxidation of 3 with PIFA in ethanol and CHCl 3 . The structures of 4 and 5 were determined by single-crystal X-ray diffraction analysis. An unusually long Ni III -C bond (2.170(9) Å) was observed in 4. The g-factor (g>2.1) observed in the EPR spectra of 4 and 5 further confirmed that they are paramagnetic Ni III complexes. Comparative experiments showed that the 3-ethoxy group plays an important role in the formation of 4 and 5. Reduction of 4 and 5 with NaBH 4 regenerated complex 3., (© 2021 Wiley-VCH GmbH.)