Crystal structures and melting points of saturated triglycerides in the β-2 phase

Abstract

Abstract. C8N2C12F4, FW 271.0; monoclinic, P2 I, a = 11-925 (2), b= 5.523 (1), c= 6.785 (1) A, fl=95.09 (2) ° (20°C). Z = 2, Dx= 2.02 g cm -3. The final R index was 5.2% (weighted R 4.0%). No absorption correction was applied (/~= 7.84 cm~). Substantial deformation of the parent 2,7-naphthyridine skeleton results because of the short CI-C1 distance (2.307 A).

Structures of mono-unsaturated triacylglycerols. III. The β-2 polymorphs of trans-mono-unsaturated triacylglycerols and related fully saturated triacylglycerols

“…The monoacid (n n n) class of TAGs has been studied in most detail, using single-crystal data (n = 10, Jensen & Mabis, 1966;n = 12, Larsson, 1965;Gibon et al, 1984; n = 16, van Langevelde et al, 1999) as well as high-resolution synchrotron powder diffraction (HR-SPD) data (n = 14, 18; van Langevelde et al, 2001a; n = 13, van Langevelde et al, 2001b;n = 15, 17, 19;Helmholdt et al, 2002) and confirmed earlier postulations of the packing of this type of polymorph (Lutton, 1971(Lutton, , 1972de Jong & van Soest, 1978). The singlecrystal packing of the (n n n) analogue EEE 1 (Culot et al, 2000) is also in accordance with this result.…”

“…The stepless terrace structure of the (n n þ 2 n þ 2)-type TAGs has been proposed by de Unit-cell dimensions as a function of the cell volume. Jong & van Soest (1978) as one of the two packing possibilities according to their -2 packing theory.…”

“…Although packing models of saturated mixed-acid TAGs have been proposed (Lutton, 1971(Lutton, , 1972de Jong & van Soest, 1978) and a structural study of the E-chain containing TAGs has been carried out (Elisabettini et al, 1998), the precise influence of replacement of the saturated S-chain by an Echain on their physical properties and packing are still not known.…”

Triclinic lattice constants of saturated mono-acid triglycerides

“…In our investigations of binary triglyceride mixtures (Precht & Greiff, 1978), we were able to establish the existence of larger quantities of the fliv form. The results of de Jong & van Soest (1978), as well as the occurrence of flxv reflections of relatively high intensity in our X-ray diffraction patterns, has induced us to undertake a study on the various arrangements existing for the fin modifications of triglycerides.…”

“…Larsson, 1964;Jensen & Mabis, 1966), which we designated as the tim form -the molecules are arranged head-to-head with the two equivalent fatty-acid chains in the so-called 2 position. A report by de Jong & van Soest (1978) further includes in a model relative shifts of monomolecular layers. In our investigations of binary triglyceride mixtures (Precht & Greiff, 1978), we were able to establish the existence of larger quantities of the fliv form.…”