X-ray diffraction and Raman study of pressure-assisted photopolymerization in the ferrocene-doped C60 crystals

Pressure-Stimulated Photopolymerization in Fullerene Layers of a Molecular Complex [{Zn(Et2dtc)}2·DABCO]·C60·(DABCO)2

“…In addition, a decrease in the interfullerene distances at high pressure raises the possibility of covalent bonding between adjacent fullerene molecules. The formation of covalent bonds in the fullerene layers at high pressure was reported in a number of Raman studies of various molecular complexes and doped C 60 materials. − On the other hand, the covalent bonding of C 60 in the fullerene layers of molecular complexes {Pt­(dbdtc) 2 }·C 60 and {Pt­(nPr 2 dtc) 2 }·(C 60 ) 2 was observed even at ambient conditions under laser irradiation , In fact, the photoinduced polymerization of C 60 films under intense UV or visible light was observed for the first time much earlier . Finally, photopolymerization in the fullerene layers of a {Cd­(dedtc) 2 } 2 ·C 60 complex was observed in the Raman spectra between 2 and 6 GPa at ambient temperature while outside this pressure range photopolymerization was suppressed …”

DFT-D3 study of two-dimensional polymerization of C60 crystal under high pressure

“…These materials can be classified on the basis of their preparation processes such as light irradiation, [1][2][3] highpressure and high-temperature treatment, [4][5][6][7] use of extrinsic dopants, 8,9) and their combinations. [10][11][12][13][14][15][16] From a structural point of view, C 60 forms dimers via covalent bonding and higher-dimensional polymers, which are bound in one dimension (1D), 2D and 3D. 4,6,7) They have several crystal structures with different bonding orientations.…”

High Pressure and High Temperature Induced Polymerization of C60 Solvates: The Effect of Intercalated Aromatic Solvents

“…Polymeric fullerenes have gained a lot of scientific attention due to their interesting physical properties and unique structures, which provide promising applications in fabricating functional materials, such as superhard materials and novel carbon materials with electronic conductivity or excellent photoluminescence (PL) properties. − Recent research has a focus on controllably fabricating polymeric fullerenes by carrying out high-pressure or high-pressure and high-temperature (HP/HPHT) treatment of doped fullerene materials. ,,− For example, a novel quasi-three-dimensional (3D) polymeric C 60 was successfully obtained by compressing a unique bilayer structured C 60 /1,1,2-trichloroethane (TCAN) solvate at room or elevated temperature . Ultrahard 3D-polymerized C 60 was synthesized in C 60 /CS 2 solvates catalyzed via CS 2 under HP/HPHT by Popov et al , One-dimensional C 60 polymers are formed in C 60 /AgNO 3 , C 60 /Ni­(OEP), C 60 (Fc) 2 (Fc: Fe­(C 5 H 5 ) 2 ), and C 60 /TDAE (TDAE: tetrakis-dimethylamino-ethylene) under HP/HPHT due to their unique initial lattice structures and the spatial confinement provided by the dopants. − In addition, a reversible polymerization of bulk C 60 and C 70 was observed under high pressure in the presence of the dopant ferrocene. , These interesting and abundant results for doped fullerene materials suggest a new strategy for creating novel polymeric fullerene materials and inspire us to study the polymerization of various other doped fullerene materials under HP/HPHT conditions.…”