Effect of magnetic particles on NMR spectra of Murchison meteorite organic matter and a polymer-based model system

E M Levin; S L Bud'ko; J D Mao; Y Huang; K Schmidt-Rohr

doi:10.1016/j.ssnmr.2007.01.002

Effect of magnetic particles on NMR spectra of Murchison meteorite organic matter and a polymer-based model system

Solid State Nucl Magn Reson. 2007 Apr;31(2):63-71. doi: 10.1016/j.ssnmr.2007.01.002. Epub 2007 Jan 26.

Authors

E M Levin¹, S L Bud'ko, J D Mao, Y Huang, K Schmidt-Rohr

Affiliation

¹ Ames Laboratory DOE, Iowa State University, Ames, IA 50011-3020, USA.

PMID: 17324558
DOI: 10.1016/j.ssnmr.2007.01.002

Abstract

Organic matter from the Murchison meteorite shows pronounced spinning sidebands of the (1)H MAS NMR spectrum and exhibits a large bulk magnetization of 0.75emicro/g extrapolated to 94kOe at 300K. By comparison with data of diamagnetic polystyrene and laponite clay mixed with ferrimagnetic gamma-Fe(2)O(3) nano-particles, we show that the spinning sidebands arise from a combination of dipolar couplings of a given (1)H to magnetic particles, seen in a backscattered-electron image, and to other protons. Signal loss and significant broadening of protonated-carbon peaks in (13)C MAS NMR spectra of polystyrene with Fe(2)O(3) nano-particles is demonstrated, and implications for (13)C NMR spectroscopy of Murchison meteorite are discussed.