naa a22 4500 510756336 CHVBK 20180411083123.0 cr unu---uuuuu 180411e20130901xx s 000 0 eng 10.1007/s12594-013-0153-0 doi (NATIONALLICENCE)springer-10.1007/s12594-013-0153-0 Solid state 13C-NMR spectroscopy of some oligocene coals of Assam and Nagaland [Elektronische Daten] [Binoy Saikia, Arpita Sharma, Kakoli Khound, Bimala Baruah] Five representative sub-bituminous coals from NE part of India have been analyzed with respect to their distribution of carbon functional groups through 13C solid state NMR experiments. The 13C Cross Polarised/Magic Angle Spinning NMR spectra of the coal samples were recorded at temperatures of 23°C, 50°C and 70°C respectively and the changes on their structures were interpreted. The NMR spectra of low rank coals were found to exhibit varying degrees of fine structures. The aromaticities of the coal were also determined from the C/H ratios of coal. Some changes in the peak positions along with the formation of simple aromatic units were observed on mild heating. Geological Society of India, 2013 Solid-state 13C-NMR nationallicence Magic angle spinning nationallicence Aromaticity nationallicence Indian coal nationallicence Saikia Binoy Coal Chemistry Division, CSIR-North East Institute of Science & Technology, 785 006, Jorhat, Assam, India aut Sharma Arpita Coal Chemistry Division, CSIR-North East Institute of Science & Technology, 785 006, Jorhat, Assam, India aut Khound Kakoli Coal Chemistry Division, CSIR-North East Institute of Science & Technology, 785 006, Jorhat, Assam, India aut Baruah Bimala Coal Chemistry Division, CSIR-North East Institute of Science & Technology, 785 006, Jorhat, Assam, India aut Journal of the Geological Society of India Springer India 82/3(2013-09-01), 295-298 0016-7622 82:3<295 2013 82 12594 https://doi.org/10.1007/s12594-013-0153-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12594-013-0153-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Saikia Binoy Coal Chemistry Division, CSIR-North East Institute of Science & Technology, 785 006, Jorhat, Assam, India aut NATIONALLICENCE 700 1- Sharma Arpita Coal Chemistry Division, CSIR-North East Institute of Science & Technology, 785 006, Jorhat, Assam, India aut NATIONALLICENCE 700 1- Khound Kakoli Coal Chemistry Division, CSIR-North East Institute of Science & Technology, 785 006, Jorhat, Assam, India aut NATIONALLICENCE 700 1- Baruah Bimala Coal Chemistry Division, CSIR-North East Institute of Science & Technology, 785 006, Jorhat, Assam, India aut NATIONALLICENCE 773 0- Journal of the Geological Society of India Springer India 82/3(2013-09-01), 295-298 0016-7622 82:3<295 2013 82 12594 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer