Open-Cage Fullerene as a Macrocyclic Ligand for Na, Pt, and Rh Metal Complexes

Abstract

An open-cage [60]­fullerene derivative was prepared through Malaprade oxidation of a vicinal triol moiety as the key step. Above the 17-membered orifice, there is one carboxyl group. Three ketone carbonyl groups and one lactone carbonyl group are located on the rim of the orifice. The carboxylic and carbonyl oxygen atoms around the orifice act as strong polydentate ligands for a sodium ion. These oxygen atoms also react with [Rh­(CO)2Cl]2 to form various isomeric rhodium complexes with comparable stability. The fullerene CC bond on the rim of the orifice forms a stable platinum complex when treated with Pt­(PPh3)4. Single crystal X-ray diffraction data reveal that one of the carboxylic oxygen atoms above the orifice forms a H-bond with the water molecule trapped in the cage.

Recent advances in supramolecular fullerene chemistry

“…Dimers were also found in other work due to coordination between metal ions (such as Na, Ag, and Pt) and donor atoms as well as intermolecular π–π interactions. 123,124,131–133 Murata and coworkers constructed a supramolecular complex by encapsulating a 3 O 2 molecule into an open-cage C 60 derivative, of which the EPR spectra exhibited triplet state character as well as the anisotropy of the 3 O 2 . 134…”

Selective anchoring of Pt NPs on covalent triazine-based frameworks via in situ derived bridging ligands for boosting photocatalytic hydrogen evolution

“…37 Due to the low loading amount and well distribution of Pt NPs, no characteristic diffraction peaks of Pt NPs are observed in Pt/AT-CTF-1. 38 As indicated in Fig. 1B, the FT-IR spectra of the catalysts show similar peaks between 1300 and 1600 cm −1 , which can be attributed to the stretching vibrations of the triazine ring in CTF-1.…”

Open-cage fullerenes as ligands for metals

“…Gan and co-workers have prepared an open-cage fullerene with a 17-membered orifice that has three keto groups, a carboxylate and one ester carbonyl group protruding from the orifice and available for metal binding. 44 This open-cage fullerene reacts with Rh 2 (CO) 4 Cl 2 to form several rhodium complexes that have not been obtained in a crystalline form and with (Ph 3 P) 4 Pt to form GLLSG-3 , whose structure is shown in Fig. 8.…”