On the Thermal Behaviour of Long-Chain Lithium and Sodium n.Alkanoates

Abstract

Di-(2-hydroxy-l-phenazinyl)methane, Phenazines, Bacterial Constituents, Pseudomonas aureofaciensThe structure elucidation of di-(2-hydroxy-l-phenazinyl)methane from Pseudomonas aureofaciens is described. In addition to the phenazine derivatives isolated earlier from this bacterium 2,3,4-trihydroxyphenazine-l-carboxylic acid and phenazine-1,6-dicarboxylic acid could be identified.

Thermal and odd–even behaviour in a homologous series of lithium n-alkanoates

“…However, the d.s.c. values are in good agreement with literature data [13,14], except for slight variations, where the literature melting temperatures are inconsistent (eg. for LiC 12 they are higher than expected; and a reversal in trend for LiC 16 and LiC 17 ).…”

“…This indicates that these carbons are in a similar chemical environment. Also, no odd-even alternation was observed in the asymmetric stretch of 1.12 ⁄ LiC 10 1.08 1.07 LiC 11 1.12 ⁄ LiC 12 1.06 1.06 LiC 13 1.10 ⁄ LiC 14 1.05 1.05 LiC 15 1.10 ⁄ LiC 16 1.05 1.04 LiC 17 1.09 ⁄ LiC 18 1.04 1.04 LiC 19 1.08 ⁄ ⁄No available data, q exp ± 0.02 Á 10 3 kg Á m À3 . the methyl groups in the IR spectra [9].…”

“…values are consistently higher than the corresponding capillary values. Clearly, the visual melting temperature data are unreliable since, for them, it is often unclear when melting begins [14]. However, the d.s.c.…”

“…Clearly, the evidence supports a rotator phase as the structure for phase II, but is by no means conclusive. [13][14][15][16][17][18][19] . A plot of phase transition temperatures versus n C is shown in figure 8.…”

Odd–even chain packing, molecular and thermal models for some long chain sodium(I) n-alkanoates

“…These results confirm that even chain adducts are intimately packed relative to odd chain homologues where IPD is large. Indeed, this is supported by the density data (Table 5) [35,36] where higher densities are observed for even chain length compounds. The lower packing intimacy of odd chain homologues is due to their naturally low molecular symmetries, relative to even chain adducts, which result in higher lattice packing energies; hence, they form relatively open lattice structures.…”