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  • 1
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    Design of Pyroelectric Mixed Crystals Having a Varying Degree of Polarity: The l-Asparagine·H2O/l-Aspartic Acid System (2015)
    American Chemical Society (ACS)
    Details
    Publication Date: 2015-04-23
    Description: Crystal Growth & Design DOI: 10.1021/acs.cgd.5b00230
    Print ISSN: 1528-7483
    Electronic ISSN: 1528-7505
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Published by American Chemical Society (ACS)
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  • 2
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    Chiral amplification of oligopeptides in two-dimensional crystalline self-assemblies on water (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2002-01-12
    Description: Differences in the two-dimensional packing arrangements of racemic and enantiomeric crystalline self-assemblies on the water surface of amphiphilic activated analogs of lysine and glutamic acid have been used to prepare oligopeptides of homochiral sequence and oligopeptides of single handedness from chiral nonracemic mixtures. The crystalline structures on the water surface were determined by grazing incidence x-ray diffraction and the diastereomeric composition of the oligopeptides by matrix-assisted laser desorption time-of-flight mass spectrometry with enantio-labeling. These results suggest that reactivity of ordered clusters at interfaces might have played a role in the generation of early homochiral biopolymers.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zepik, Helmut -- Shavit, Edna -- Tang, Mao -- Jensen, Torben R -- Kjaer, Kristian -- Bolbach, Gerard -- Leiserowitz, Leslie -- Weissbuch, Isabelle -- Lahav, Meir -- New York, N.Y. -- Science. 2002 Feb 15;295(5558):1266-9. Epub 2002 Jan 10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Materials and Interfaces, Weizmann Institute of Science, 76100 Rehovot, Israel.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11786606" target="_blank"〉PubMed〈/a〉
    Keywords: Biopolymers ; Crystallization ; Glutamic Acid/*analogs & derivatives/chemistry ; Lysine/*analogs & derivatives/chemistry ; Oligopeptides/*chemistry ; Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization ; Stereoisomerism ; Water ; X-Ray Diffraction
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
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    A Synchrotron X-ray Study of a Solid-Solid Phase Transition in a Two-Dimensional Crystal (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-12-02
    Description: A measurement and interpretation on a molecular level of a phase transition in an ordered Langmuir monolayer is reported. The diagram of surface pressure (pi) versus molecular area of a monolayer of chiral (S)-[CF(3)-(CF(2))(9)-(CH(2))(2)-OCO-CH(2)-CH (NH(3)(+))CO(2)(-)] over water shows a change in slope at about pi(s)= 25 millinewtons per meter. Grazing-incidence x-ray diffraction and specular reflectivity measurements indicate a solid-solid phase transition at pi(s). The diffraction pattren at low pressures reveals two diffraction peaks of equal intensities, with lattice spacings d of 5.11 and 5.00 angstroms; these coalesce for pi 〉/=pi(s). Structural models that fit the diffraction data show that at pi〉 pi(s) the molecules pack in a two-dimensional crystal with the molecules aligned vertically. At pi 〈 pi(s) there is a molecular tilt of 16 degrees +/- 7 degrees . Independent x-ray reflectivity data yield a tilt of 26 degrees +/- 7 degrees . Concomitant with the tilt, the diffraction data indicate a transition from a hexagonal to a distorted-hexagonal lattice. The hexagonal arrangement is favored because the -(CF(2))(9)CF(3) moiety adopts a helical conformation. Compression to 70 millinewtons per meter yields a unit cell with increased crystallinity and a coherence length exceeding 1000 angstroms.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wolf, S G -- Landau, E M -- Lahav, M -- Leiserowitz, L -- Deutsch, M -- Kjaer, K -- Als-Nielsen, J -- New York, N.Y. -- Science. 1988 Dec 2;242(4883):1286-90.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17817076" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 4
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    Ice nucleation by alcohols arranged in monolayers at the surface of water drops (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-11-16
    Description: Monolayers of aliphatic long-chain alcohols induced nucleation of ice at temperatures approaching 0 degrees C, in contrast with water-soluble alcohols, which are effective antifreeze agents. The corresponding fatty acids, or alcohols with bulky hydrophobic groups, induce freezing at temperatures as much as 12 degrees C lower. The freezing point induced by the amphiphilic alcohols was sensitive not only to surface area per molecule but, for the aliphatic series (C(n)H(2n + 1)OH), to chain length and parity. The freezing point for chains with n odd reached an asymptotic temperature of 0 degrees C for an upper value of n = 31; for n even the freezing point reached a plateau of -8 degrees C for n in the upper range of 22 to 30. The higher freezing point induced by the aliphatic alcohols is due to formation of ordered clusters in the uncompressed state as detected by grazing incidence synchrotron x-ray diffraction measurements. The diffraction data indicate a close lattice match with the ab layer of hexagonal ice.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gavish, M -- Popovitz-Biro, R -- Lahav, M -- Leiserowitz, L -- New York, N.Y. -- Science. 1990 Nov 16;250(4983):973-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17746923" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
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    Crystallinity of the double layer of cadmium arachidate films at the water surface (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-06-14
    Description: A crystalline counterionic layer at the interface between an electrolyte solution and a charged layer of insoluble amphiphilic molecules was observed with grazing incidence synchrotron x-ray diffraction. Uncompressed arachidic films spread over 10(-3) molar cadmium chloride solution (pH 8.8) spontaneously form crystalline clusters with coherence lengths of approximately 1000 angstroms at 9 degrees C. Ten distinct diffraction peaks were observed, seven of which were attributed to scattering only from a crystalline Cd(2+) layer and the other three to scattering primarily from the arachidate layer. The reflections from the Cd(2+) layer were indexed according to a 2 x 3 supercell of the arachidate lattice with three Cd(2+) ions per cadmium unit cell.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Leveiller, F -- Jacquemain, D -- Lahav, M -- Leiserowitz, L -- Deutsch, M -- Kjaer, K -- Als-Nielsen, J -- New York, N.Y. -- Science. 1991 Jun 14;252(5012):1532-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17834878" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
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    Impact of molecular order in langmuir-blodgett films on catalysis (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-01-04
    Description: Catalytically active Langmuir-Blodgett films of a rhodium complex were prepared and characterized to determine the possible effect of the molecular order of metal complexes on catalytic activity. The hydrogenation of carbon-oxygen double bonds was used as a model reaction. The complex in solution exhibited low catalytic activity, whereas it was highly active in the film. The catalytic activity was found to be highly dependent on the orientation of the complex within the film. The reactions were also highly selective with regard to the substrate. These observations and the observed rate dependence on temperature strongly implicate the molecular order of a metal complex as an important dimension in catalysis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tollner -- Popovitz-Biro -- Lahav -- Milstein -- New York, N.Y. -- Science. 1997 Dec 19;278(5346):2100-2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉K. Tollner and D. Milstein, Department of Organic Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel. R. Popovitz-Biro and M. Lahav, Department of Materials and Interfaces, The Weizmann Institute of Science, Rehovot 761.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9405341" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 7
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    Formation of Chiral Interdigitated Multilayers at the Air-Liquid Interface Through Acid-Base Interactions (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-12-20
    Description: Thin interdigitated films composed of a long-chain, water-insoluble chiral acid (p-pentadecylmandelic acid of absolute configuration R) and a water-soluble chiral base (phenylethylamine, R') were constructed at the air-solution interface. The (R, R') structure was characterized to near-atomic resolution by grazing-incidence x-ray diffraction (GIXD). The two diastereomeric systems, (R, R') and (R, S'), demonstrate similar surface pressure-molecular area isotherms, but their structures are completely different on the molecular level, as monitored by GIXD. Complementary data on these two architectures were provided by atomic force microscopy.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kuzmenko I -- Buller -- Bouwman -- Kjaer -- Als-Nielsen -- Lahav -- Leiserowitz -- New York, N.Y. -- Science. 1996 Dec 20;274(5295):2046-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉I. Kuzmenko, R. Buller, M. Lahav, L. Leiserowitz, Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot 76100, Israel. W. G. Bouwman and K. Kjaer, Department of Solid State Physics, Riso National Laboratory, DK-4000 Roskilde, Denmark. J. Als-Nielsen, Niels Bohr Institute, H. C. Orsted Laboratory, DK-2100 Copenhagen, Denmark.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8953028" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
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  • 8
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    Control of structure and growth of polymorphic crystalline thin films of amphiphilic molecules on liquid surfaces (1994)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1994-06-10
    Description: The spontaneous formation and coexistence of crystalline polymorphic trilayer domains in amphiphilic films at air-liquid interfaces is demonstrated by grazing incidence synchrotron x-ray diffraction. These polymorphic crystallites may serve as models for the early stages of crystal nucleation and growth, helping to elucidate the manner in which additives influence the progress of crystal nucleation, growth, and polymorphism and suggesting ways of selectively generating and controlling multilayers on liquid surfaces. Auxiliary molecules have been designed to selectively inhibit development of the polymorphs, leading primarily to a single phase monolayer.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Weinbach, S P -- Kjaer, K -- Bouwman, W G -- Grubel, G -- Legrand, J F -- Als-Nielsen, J -- Lahav, M -- Leiserowitz, L -- New York, N.Y. -- Science. 1994 Jun 10;264(5165):1566-70.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17769599" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 9
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    Electron diffraction and imaging of uncompressed monolayers of amphiphilic molecules on vitreous and hexagonal ice (1993)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1993-08-13
    Description: A new approach is described for probing domains of ordered self-assemblies of amphiphilic monolayers at the aqueous solution interface. The method has potential importance for the study of membrane structure, Langmuir-Blodgett films, and nucleation processes of two-and three-dimensional crystals. Electron diffraction (ED) patterns indicative of two-dimensional crystalline self-assembly were obtained from samples, which were examined by cryo-electron microscopy, of monolayers of water-insoluble amphiphiles on vitrified aqueour substrates. The apparent hexagonal symmetry of an ED pattern from a C(16)H(33)OH monolayer was interpreted in terms of multiple twinning. Monolayers of the CL(31)H(63)OH and cadmium salt of C(19)H(39)CO(2)H that were studied by dark-field techniques displayed faceted two-dimensional crystallites with a maximal size of 1 to 2 micrometers. Epitaxial nucleation of hexagonal ice by the C(31)H(63)OH monolayer has also been demonstrated by ED.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Majewski, J -- Margulis, L -- Jacquemain, D -- Leveiller, F -- Bohm, C -- Arad, T -- Talmon, Y -- Lahav, M -- Leiserowitz, L -- New York, N.Y. -- Science. 1993 Aug 13;261(5123):899-902.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17783738" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
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    The role of crystal polarity in alpha-amino acid crystals for induced nucleation of ice (1992)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1992-05-08
    Description: The hydrophobic faces of single crystals of a series of pairs of racemic and chiral-resolved hydrophobic alpha-amino acids were used as a substrate, onto which water vapor has been cooled to freezing. The morphologies and molecular packing arrangements within each crystal pair are similar but only one of each pair exhibits a polar axis, parallel to the hydrophobic face exposed to water. Those crystals that have a polar axis induce a freezing point higher by 4 degrees to 5 degrees C than the corresponding crystals that do not have a polar axis. The results are interpreted in terms of an electric field mechanism that helps align the water molecules into ice-like clusters en route to crystallization.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gavish, M -- Wang, J L -- Eisenstein, M -- Lahav, M -- Leiserowitz, L -- New York, N.Y. -- Science. 1992 May 8;256(5058):815-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Materials and Inferfaces, Weizmann Institute of Science, Rehovot, Israel.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1589763" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acids/*chemistry ; Animals ; Crystallization ; *Ice ; Isomerism ; Models, Molecular
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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