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. 2019 Jan 30;10(1):485.
doi: 10.1038/s41467-019-08343-6.

Flexible decapyrrylcorannulene hosts

Affiliations

Flexible decapyrrylcorannulene hosts

Yun-Yan Xu et al. Nat Commun. .

Abstract

The assembly of spherical fullerenes, or buckyballs, into single crystals for crystallographic identification often suffers from disordered arrangement. Here we show a chiral configuration of decapyrrylcorannulene that has a concave 'palm' of corannulene and ten flexible electron-rich pyrryl group 'fingers' to mimic the smart molecular 'hands' for self-adaptably cradling various buckyballs in a (+)hand-ball-hand(-) mode. As exemplified by crystallographic identification of 15 buckyball structures representing pristine, exohedral, endohedral, dimeric and hetero-derivatization, the pyrryl groups twist with varying dihedral angles to adjust the interaction between decapyrrylcorannulene and fullerene. The self-adaptable electron-rich pyrryl groups, susceptible to methylation, are theoretically revealed to contribute more than the bowl-shaped palm of the corannulene in holding buckyball structures. The generality of the present decapyrrylcorannulene host with flexible pyrryl groups facilitates the visualization of numerous unknown/unsolved fullerenes by crystallography and the assembly of the otherwise close-packed spherical fullerenes into two-dimensional layered structures by intercalation.

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Conflict of interest statement

The authors declare no competing interests.

Figures

Fig. 1
Fig. 1
Synthesis of decapyrrylcorannulene derivatives 2 from decachlorocorannulene 1. Conditions: NaH (60% oil dispersion, 2.0 mmol, 12 eq for 2a, 3.4 mmol, 20 eq for 2b), pyrrole (2.0 mmol, 12 eq) or 3,4-dimethylpyrrol (3.4 mmol, 20 eq), decachlorocorannulene 1 (0.17 mmol, 1 eq), 25 °C, 12 h. DMF: N,N-dimethylformamide
Fig. 2
Fig. 2
Crystallographic structures and packing of 2a and 2b. a, c Crystallographic structures of 2a and 2b with thermal ellipsoids at the 50% probability level. The bowl depths of 2a and 2b are indicated. b, d Packing structures of 2a in the ac plane and 2b in the bc plane. C atom is shown in gold and N atom in navy blue. All hydrogen atoms are omitted for clarity
Fig. 3
Fig. 3
Crystallographic structure and packing of 2DPC{C60}. a Side view of 2DPC{C60}. b Packing structure of 2DPC{C60} in the b–c plane. C atom in 2a is shown in gold, C60 in grey and N atom in navy blue. All hydrogen atoms and solvent molecules (CS2) are omitted for clarity
Fig. 4
Fig. 4
Crystallographic structures of co-crystals between DPC (2a) and fullerenes. a 2DPC{C60}, b 2DPC{C70}, c 2DPC{C90}, d 2DPC{α-PC71BM}, e 2DPC{β1-PC71BM}, f 2DPC{PC61P}, g 2DPC{PC61AE}, h 2DPC{Cs-C71H2-I}, i 2DPC{Cs-C71H2-II}, j 2DPC{C65H6}, k 2DPC{C60HPh}, l 2DPC{C60HCH3}, m 2DPC{C2v-C71H2-III}, n 2DPC{Sc3N@C80}, o 2DPC{(C59N)2}. PC61P: [6,6]-phenyl-C61-pyridyl. PC61AE: [6,6]-pyridyl-C61-acetic acid ethyl ester. C atom is shown in gold, N atom in navy blue, Sc atom in green, and O atom in red. All hydrogen atoms and solvent molecules in the crystal structures have been omitted for clarity
Fig. 5
Fig. 5
Layered structure of the co-crystal formed between DPC (2a) and C60. a, b Edge-on view (a) and top view (b) of the space-filling structure of C60 and the stick structure of DPC. FL is a monolayer of C60, and DL is a slightly corrugated double DPC layer. C atom is shown in gold, N atom in navy blue, and C60 in purple. All hydrogens and solvent molecules (CS2) in the co-crystal have been omitted for clarity
Fig. 6
Fig. 6
The total interaction energies and partial interaction energies for six representative co-crystals. All values in the figure are absolute values. ∆EintF/2DPC (black columns), ∆EintF/P (red columns), and ∆EintF/C (blue columns) represent the interaction energies between fullerene (F) and both hosts (2DPC), fullerene (F) and pyrryl groups (P), and fullerene (F) and corannulene part (C), respectively

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