NDLI: Polyhydroxy fullerenes

Content Provider	Springer Nature Link
Author	Georgieva, Angelina T. Pappu, Vijay Krishna, Vijay Georgiev, Pando G. Ghiviriga, Ion Indeglia, Paul Xu, Xin Fan, Z. Hugh Koopman, Ben Pardalos, Pas M. Moudgil, Brij
Copyright Year	2013
Abstract	Characterization of C$_{60}$ polyhydroxyfullerenes (PHF) prepared in alkaline media, preparation facilitated by phase-transfer catalyst, presents challenges in determining the chemical structure resulting from the possibility of multiple isomers or analogs with greater or fewer hydroxyl groups from a single reaction mixture. This paper presents the utilization of analytical methods employed in tandem, especially X-ray photoelectron spectroscopy, nuclear magnetic resonance spectroscopy, Fourier transform infrared spectroscopy for semi-quantitative analysis on the number of hydroxyl groups present in PHF. Capillary Electrophoresis was used for purity estimation of the material. Multiple spectra and electropherograms were analyzed using a new simultaneous curve fitting method. The most accurate estimate of hydroxyl groups for C$_{60}$ polyhydroxy fullerenes obtained is between 16 and 18 allylic hydroxyl groups by combining analytical methods’ results with 5 % accuracy. High precision (reproducibility) of the experiments is observed. Purity of 98 % is estimated by capillary electrophoresis. The size of PHF nanoparticles or aggregates has been determined by atomic force microscopy to be 7.4–14.2 nm. According to the elemental analysis the average probable empirical formula for the most pure PHF at pH 7.1 is C$_{60}$O$_{17}$H$_{12}$Na$_{5}$(NaHCO$_{3}$)$_{3}$(H$_{2}$O)$_{13}$ and the average formula weight is 1,605.9 g/mol. This is the first thorough characterization of PHF in terms of purity.
Starting Page	1
Ending Page	18
Page Count	18
File Format	PDF
ISSN	13880764
Journal	Journal of Nanoparticle Research
Volume Number	15
Issue Number	7
e-ISSN	1572896X
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-06-14
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hydroxyl number Paramagnetism Purity estimation Simultaneous non-linear least squares curve fitting Nanotechnology Inorganic Chemistry Characterization and Evaluation of Materials Physical Chemistry Optics, Optoelectronics, Plasmonics and Optical Devices
Content Type	Text
Resource Type	Article
Subject	Chemistry Nanoscience and Nanotechnology Atomic and Molecular Physics, and Optics Condensed Matter Physics Bioengineering Modeling and Simulation

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Polyhydroxy fullerenes