Carbon exists as a variety of nanometer-sized allotropes, such as 0D fullerenes, 1D carbon nanotubes (CNTs), and 2D graphene. So far, it is still a great challenge to construct CNTs with a fixed length and diameter-specified single-chirality. We have synthesized a series of novel large π-extended molecular carbon nanorings and nanocrowns based on nanographene hexa-peri-hexabenzocoronene (HBC) unit (named as [n]CHBCs) and other nanographenes as a finite model of armchair CNTs, including [n]CHBCs (n=4,6,8), TCR, and HCR, et al (Figure 1).1-3 Their tubular structures of these [n]CHBCs have also been characterized using various physical methods, including NMR, STM, PL, crystallographic analysis, and STM images. In addition, the photophysical properties of these nanocarbons are studied in solution and explained by theoretical calculations. TCR and HCR can selectively capture fullerene C60 due to strong supramolecular interactions and the molecular structure of C60@TCR is unambiguously determined by single-crystal X-ray diffraction. Compared to the HBC monomer, obvious redshift in absorption and emission spectra has been observed in these HBC carbon nanorings and nanocrowns. More recently, we constructed a three-dimensional capsule-like HBC-containing carbon nanocage,4 which can be considered as a novel synthetic model of the capped zigzag [12,0] carbon nanotubes. 1. Lu, D. P.; Wu, H. T.; Dai, Y. F.; Shi, H.; Shao, X.; Yang, S. F.; Yang, J. L.; Du, P. W. Chem. Commun. 2016, 52, 7164-7167. 2. Lu, D.P.; Zhuang, G. L.; Wu, H. T.; Wang, S.; Yang, S. F.; Du, P. W. Angew. Chem., Int. Ed. 2017, 56, 158-162. 3. Jia, H. X.; Zhuang, G. L.; Wang, J. Y.; Huang, Q.; Wu, Y. Y.; Zhou, Y.; Yang, S. F.; Du, P. W. submitted for publication, 2019. 4. Cui, S. S.; Zhuang, G. L.; Lu, D. P.; Jia, H. X.; Wang, Y.; Yang, S. F.; Du, P. W. Angew. Chem., Int. Ed. 2018, 57, 9330-9335. Figure 1