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Structure, Optical, and Magnetic Properties of (PPN + ) 2 (C 70 2− )⋅2 C 6 H 4 Cl 2 , which Contains Dianionic Polymeric (C 70 2− ) n Chains
Author(s) -
Konarev Dmitri V.,
Troyanov Sergey I.,
Khasanov Salavat S.,
Otsuka Akihiro,
Yamochi Hideki,
Saito Gunzi,
Lyubovskaya Rimma N.
Publication year - 2013
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201300086
Subject(s) - electron paramagnetic resonance , crystallography , diamagnetism , magnetic susceptibility , chemistry , triphenylphosphine , impurity , polymer , materials science , nuclear magnetic resonance , physics , magnetic field , biochemistry , organic chemistry , quantum mechanics , catalysis
A new salt, (PPN + ) 2 (C 70 2− ) ⋅ 2 C 6 H 4 Cl 2 ( 1 ), which contains C 70 2− dianions, has been obtained as single crystals (PPN + =bis(triphenylphosphine)iminium cation). The C 70 2− dianions form polymeric zigzag (C 70 2− ) n chains, in which the fullerene units are bonded through single CC bonds of length 1.581(5)–1.586(6) Å. The distance between the centers of neighboring C 70 2− units is 10.441 Å. The optical and magnetic properties of (C 70 2− ) n have also been studied. Decreasing the symmetry of C 70 in the polymer activate about 20 new IR bands in addition to the 10 IR‐active bands of the starting C 70 . The polymeric structure shows absorptions in the visible and NIR regions, with three main bands at 890, 1200, and 1550 nm, instead of one band of isolated C 70 2− dianions at 1165–1184 nm. We concluded that the (C 70 2− ) n polymer was diamagnetic, with a negative molar magnetic susceptibility of −3.82×10 −4 emu mol −1 per C 70 2− dianion. The polymer is EPR silent and a weak narrow EPR signal in salt 1 is due to impurities, which only constitute 0.84 % of spin S =1/2 of the total amount of fullerene C 70 .