G. Luis-Raya, M. Ramírez-Cardona, M. Falcón-León
Aug 1, 2018
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Microscopy and Microanalysis
Abstract
α,ω-alkanediols are simple aliphatic compounds with two hydroxyl groups at both sides of chain, but their crystal structures are quite complex showing melting point alternation and two kinds of crystal packing (herringbone and parallel motif), which depends on the parity of the number of carbon atoms. Even-odd behavior in α,ω-alkanediols has been widely studied [1-3] and the crystal structures displays marked differences between both even and odd number of carbon atoms compounds. In this work we present the Rietveld refinement of 1, 15-pentadecanediol (PTDOL) with data obtained from Glancing Incidence X-ray Diffraction (GIXD). Two samples of PTDOL were analyzed, the recrystallized from ethyl ether (PTDOL-R) and sample used as obtained from synthesis (PTDOL-NR). The studied compound crystallizes in space group P212121 with unit cell parameters: a = 7.256(2) Å , b = 42.7680(6) Å, c = 5.1103(2) Å (for PTDOL-R) and a= 7.3614(1) Å, b= 41.8048(6) Å, c= 5.1732(4) Å (for PTDOLNR). High temperature phase at 70oC was also studied by Polarized Light Microscopy.