ISSN:
1612-1112
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Summary Retention volumes, Vs, 1, and isosteric heats of adsorption, Q1, at low surface coverages on graphitized thermal carbon black for C6−C10 n-alkynes have been determined and correlated with their structure. Linear dependences of log Vs, 1 and Q1 on n the number of carbon atoms in the molecule of the alkyne have been observed. Introduction of the triple bond into the molecule decreases the Vs, 1 and Q1 values compared to those of the corresponding n-alkanes and n-alkenes. Comparison with n-alkenes shows rather small differences between Q1 values for internal n-alkynes and corresponding normal cis-alkenes. For the same n and position of the multiple bond the individual compounds elute in the following order: n-alkyne, cis-n-alkene (sometimes simultaneously), trans-n-alkene, n-alkane. At the same time, the Q1 values increase as the triple bond shifts from the centre of the molecule towards the second carbon atom and then decrease again for 1-n-alkynes The isosteric heats of adsorption of n-1-alkynes are approximately 0.4–1.7 kJ mole−1 lower than those for n-1-alkenes. The regularities of adsorption of C6−C10 nomal alkenes and some 1-alkynes, up to 1-hexyne, on graphitized thermal carbon black (GTCB) have been investigated in previvous papers [1–3]. In this paper the gas chromatographic investigation of adsorption of unsaturated hydrocarbons on GTCB has been extended to isomeric C6−C10 n-alkynes.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02350796
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