[��[��"�~��z~����2[E���?��}]���uW?^���x~ 3 0 obj The most abundant fragment ion is usually the 3 carbon fragment, with the abundances of higher mass ions decreasing with increasing mass. Tino Gäumann. Learn more. Olefinic Fragments—What is their Structure? endobj Check your list of mass differences created in Step 3. <>/ExtGState<>/Font<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 595.32 841.92] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> Working off-campus? <> Learn more. Mass spectral fragments of common hydrocarbons Mass Spectral peaks can be identified to have originated from the fragmentation of specific hydrocarbon sources including: Alkanes: 57 / 43. 4 0 obj 1 0 obj The full text of this article hosted at iucr.org is unavailable due to technical difficulties. Use the link below to share a full-text version of this article with your friends and colleagues. <> %���� m��iT`�y��������)��!��� Institute of Physical Chemistry, Federal School of Technology, CH‐1015 Lausanne, Switzerland. �)�����ը��SѝKݹA% ��`��TR��υ��Հ:{���>|c;Jrb ��;���@5�}!��_���=-/��aI���!�‰*rU��7��0���j����8&\�S�r�|�ʠ�C�p�`0�f��~X�7c�TH���'�8-jT�2( ���v�C[���٧��Z���T�=~y�>|���ql�*�����F7�! If one of these ∆m values is larger than 16 mass units, use the Periodic Table to … Search for more papers by this author. stream If you do not receive an email within 10 minutes, your email address may not be registered, and you may need to create a new Wiley Online Library account. Alkane; Amide; Amine; Aromatic; Carboxylic Acid; Ester; Ether; Halide; Ketone; Contributors and Attributions; Following are examples of compounds listed by functional group, which demonstrate patterns which can be seen in mass spectra of compounds ionized by electron impact ionization. Study Notes When interpreting fragmentation patterns, you may find it helpful to know that, as you might expect, the weakest carbon-carbon bonds are the ones most likely to break. )��*a7� 0��'�*�,��aY� ��W��4��$$ƻ�9�G(*$�KWД�*�gv�W B��������]c����[�Z�f��R���w�G�ma��������l�Nrq����-/��'+��:��/[�V� %�e���)��� ���5J�}��NP7@��^$��q����C�����q���ߢR������;�-z�0룾��g�x�E5�c�����[k��o=�8��A���c����k.�:�J#FTr?wd�t����J6f=�rNgɨz&�e-P@�Pk���@���B�{�}���1������%`��VK�{"�b�'�؂p��-;����Q�؊T�H �FU=�9h1Ibj30��W�DՆj^�-|Wb^�$����P�3���mMj!j�>�w��'���B.��̬�V��JG�A�P~W�‘rl��CF�=�ڡb;Tl}B������!B09xc�%��Qw,�Ba� Olefinic Fragments—What is their Structure? Ions observed in the mass spectra of straight chain alkanes will usually appear in groups of 14 mass unit intervals (corresponding to one CH2 group difference). Working off-campus? Some Common Fragments at m/z include: 14 CH2 15 CH3 16 O 17 OH 18 H2O, NH4 Tino Gäumann, Mass Spectra of Double‐Bonded Groups, PATAI'S Chemistry of Functional Groups, (2009). Number of times cited according to CrossRef: ChemInform Abstract: The Mass Spectra of Alkanes. Luckily, singularly halogenated alkanes have easily identifiable mass spectra (see iodobutane spectra below). Enter your email address below and we will send you your username, If the address matches an existing account you will receive an email with instructions to retrieve your username, I have read and accept the Wiley Online Library Terms and Conditions of Use. The full text of this article hosted at iucr.org is unavailable due to technical difficulties. If you do not receive an email within 10 minutes, your email address may not be registered, <>>> use the fragmentation pattern in a given mass spectrum to assist in the identification of a relatively simple, unknown compound (e.g., an unknown alkane). Learn about our remote access options, Institute of Physical Chemistry, Federal School of Technology, CH‐1015 Lausanne, Switzerland. Please check your email for instructions on resetting your password. If you have previously obtained access with your personal account, please log in. �\n4(r��P����*��(�>�e�C;�� |�"���i�QV�(��2���Ev���B�+���>,������g?�h=��%U�� ���9+��&�2���*�IU�d�����߾�a��j���ﳢ��n&ugJ�L���Jz&�,S������S� Please check your email for instructions on resetting your password. endobj %PDF-1.5 and you may need to create a new Wiley Online Library account. The Mass Spectra of Alkanes. Use the link below to share a full-text version of this article with your friends and colleagues. 2 0 obj Wiley Online Library T. GAEUMANN , ChemInform Abstract: The Mass Spectra of Alkanes , … x��\ms�6���~�ژ"��N�3�[7�\�4�]����bS���哔��~�� � Id:I-X�ط��zy8m7��S���������S}�}X�ڟN�ݟ���z�n}�}\�������'��j�?Շ��^}����LE^e��E?��L�%ev�;? Institute of Physical Chemistry, Federal School of Technology, CH‐1015 Lausanne, Switzerland. ���ɑ2W������%[�eo���)UN|�`.uFs�6D�{�w?�����0/a�`��笚�s~��#�Ql��F$@߆��M��-s4�����q��~�����Wt����ı!�ּƴ�u��r��!mi��N;W����{3X�r�x�XbH:�D}E04���n��R�����O1��?k;���'�����v���ĕ�굮a��%k�@���fT6��W.�&�_�*@)����D��f@�m�ü�ݦ#��ʼ��eGU��X�T.�qK@��Zb �� щ������"� �Y-iA�b�|Xd~*�+bJ�/3ʓ"g"YywV������8�g�3 �D�. Butane—The Structure of the Molecular Ion, Methylcyclohexane—The Danger of Insufficient Labelling. Alkenes: 55 / 41 Per fluorinated hydrocarbons: 69 Aromatics: 75-78, /130-138. endobj Butane—The Structure of the Molecular Ion, Methylcyclohexane—The Danger of Insufficient Labelling. Learn about our remote access options, Institute of Physical Chemistry, Federal School of Technology, CH‐1015 Lausanne, Switzerland. Enter your email address below and we will send you your username, If the address matches an existing account you will receive an email with instructions to retrieve your username, By continuing to browse this site, you agree to its use of cookies as described in our, I have read and accept the Wiley Online Library Terms and Conditions of Use. 1. Tino Gäumann.