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@ARTICLE{Vollhardt:453858,
      author       = {Vollhardt, D. and Dobner, B. and Brezesinski, G.},
      title        = {{I}nfluence of linkage type (ether or ester) on the
                      monolayer characteristics of single-chain glycerols at the
                      air–water interface},
      journal      = {Physical chemistry, chemical physics},
      volume       = {22},
      number       = {40},
      issn         = {1463-9084},
      address      = {Cambridge},
      publisher    = {RSC Publ.},
      reportid     = {PUBDB-2021-00222},
      pages        = {23207 - 23214},
      year         = {2020},
      abstract     = {O-1-Alkylglycerols are ubiquitous constituents in various
                      biological materials but their biological significance is
                      still largely unknown. So far, reports about the striking
                      role of structural features on the interfacial properties of
                      1-O-alkylglycerol monolayers are quite rare. Therefore, in
                      the present paper 1-O-alkylglycerol monolayers are
                      comprehensively characterized on mesoscopic and molecular
                      scales in the accessible ranges of temperature and surface
                      pressure. Two Bragg peaks found for the condensed monolayer
                      phase of the racemates at all pressures investigated
                      indicate an orthorhombic structure with NN-tilted alkyl
                      chains at lower pressures and NNN-tilted chains at higher
                      pressures. In contrast to the continuous change of the tilt
                      angle, as observed for many amphiphile monolayers, the tilt
                      angle in 1-O-alkyl-rac-glycerol monolayers shows a jump-like
                      transition from the L$_2$ (NN tilt direction) to the Ov
                      phase (NNN tilt direction) with the consequence of different
                      slopes of 1/cos(t) vs. π in the two phases. This is the
                      most striking difference to the behavior of the
                      corresponding ester compound 1-stearoyl-rac-glycerol, having
                      an oblique phase between the two orthorhombic phases L$_2$
                      and Ov at low temperatures. The generic phase diagrams of
                      the 1-O-alkyl-rac-glycerol and 1-acyl-rac-glycerol
                      monolayers are essentially different. The influence of
                      chirality on the monolayer structure is weak and becomes
                      even weaker at high temperatures (rotator phases) and high
                      lateral compression. The GIXD results of the enatiomeric
                      pure compounds show the expected oblique lattice structure
                      characterized by three Bragg peaks at almost all lateral
                      pressures measured. The results of the GIXD studies are
                      complemented by other monolayer characteristics such as
                      π–A isotherms and mesoscopic domain topographies. The
                      π–A isotherms of 1-O-alkyl-rac-glycerols are similar to
                      those of the corresponding 1-acyl-rac-glycerols indicating
                      that the change from the ester linkage to the ether linkage
                      does not affect significantly the thermodynamic features.
                      However, pronounced differences in the topological structure
                      are observed. 1-O-hexadecyl-rac-glycerol monolayers form
                      three-armed domains whereby each arm is subdivided into two
                      segments with different molecular orientation. Also
                      fascinating chiral discrimination effects are observable,
                      demonstrated in the case of S-enantiomers by always
                      clockwise curved spirals at the domain periphery. The
                      1 : 1 racemic mixtures exhibit both clockwise and
                      counterclockwise curved spirals.},
      cin          = {DOOR ; HAS-User},
      ddc          = {540},
      cid          = {I:(DE-H253)HAS-User-20120731},
      pnm          = {899 - ohne Topic (POF3-899)},
      pid          = {G:(DE-HGF)POF3-899},
      experiment   = {EXP:(DE-H253)D-BW1-20150101},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:33029597},
      UT           = {WOS:000581596800035},
      doi          = {10.1039/D0CP04153J},
      url          = {https://bib-pubdb1.desy.de/record/453858},
}