The Structure and Symmetry of Crystalline Solid Solutions: A General Revision

Vaida, M.; Shimon, Linda J. W.; Weisinger-Lewin, Y.; Frolow, Felix; Lahav, M.; Leiserowitz, Leslie; McMullan, R. K.

doi:10.1126/science.241.4872.1475

Cited by 100 publications

(97 citation statements)

References 9 publications

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“…The CdS molecules with a smaller atomic radius, formed during the reaction, may serve as ªtailor-madeº crystal growth inhibitors to form a mixed solid solution with PbS. [18,34,35] Consequently, the smaller NPs are richer in cadmium, and thus richer in defect sites. Charge carriers are presumably trapped at these sites, and thus prolong the emission lifetime of the NPs, as demonstrated by the photoluminescence experiments.…”

Section: Discussionmentioning

confidence: 99%

(Pb1xCdx)S Nanoparticles Embedded in a Conjugated Organic Matrix, as Studied by Photoluminescence and Light-Induced X-ray Photoelectron Spectroscopy

Buller

Cohen²,

Minkin

et al. 2002

Adv. Funct. Mater.

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Elliptically shaped (Pb1–xCdx)S nanoparticles (NPs) of average size 2.3 × 2.9 nm (minor axis × major axis) have been prepared via reaction of a solid [oligo(p‐phenylene‐ethynylene) dicarboxylate]Pb0.9Cd0.1 salt matrix, with gaseous H2S. A significantly long emission lifetime, with multi‐exponential behavior, is detected in time‐resolved photoluminescence measurements, substantially different from the decay patterns of pure PbS and CdS NPs within the same organic matrix. Evidence for the co‐existence of Cd and Pb within the same particle is provided by light‐induced X‐ray photoelectron spectroscopy.

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Section: Discussionmentioning

confidence: 99%

(Pb1xCdx)S Nanoparticles Embedded in a Conjugated Organic Matrix, as Studied by Photoluminescence and Light-Induced X-ray Photoelectron Spectroscopy

Buller

Cohen²,

Minkin

et al. 2002

Adv. Funct. Mater.

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“…However, reactivity in crystals can be further exploited for the preparation of enantiopure oligopeptides, generated either by the polymerization of appropriate racemic monomers in the presence of small amounts of enantioselective initiators and inhibitors, [24] or by the amplification of chirality originating from nonracemic mixtures [8,25] of monomers of low enantiomeric imbalance that undergo phase separation.…”

Section: Angewandte Chemiementioning

confidence: 99%

Generation of Oligopeptides with Homochiral Sequences by Topochemical Reactions within Racemic Crystals of Phenylalanine‐N‐carboxyanhydride

et al. 2003

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Theories on the origin of life suggest that homochiral biopolymers were already being generated in prebiotic times from racemic mixtures of activated monomeric precursors; [1][2][3] various scenarios for their formation have been proposed. [4][5][6][7] In our current program we promote a conceivable scheme for the formation of primitive homochiral polymers from mixtures of racemates or nonracemic mixtures of low enantiomeric imbalance, by their self-assembly within twodimensional (2D) or 3D crystalline architectures of distinct packing motifs, followed by lattice-controlled polymerization reactions.[8-10] The overall process entails two different aspects: a) Generation of racemic mixtures of homochiral polymers from racemates, and b) only one of the two enantiomeric polymers are formed by spontaneous symmetry breaking or by asymmetric induction.Polymerization reactions within rigid 3D crystals, initiated either thermally or by irradiation, are controlled by the crystal lattice, to the greatest extent, at the onset of the reaction, since the polymeric phase produced is generally much denser than the crystalline monomer reactant. Changes in density and heat release that occur at sites of chain propagation induce local disorder, which brings about the formation of nonstereospecific polymers. Consequently, after years of research, only a limited number of systems including dieth-

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“…Reduction in crystal symmetry was demonstrated by photodimerization, X-ray and neutron diffraction for the host-guest crystal structure of E-cinnamamide-2-E-thienylacrylamide (Vaida et al, 1988;Shimon et al, 1993). The host structure [ Fig.…”

Section: Probing Intermolecular Forces Through Reduced Crystal Symmetrymentioning

confidence: 99%

Understanding and control of nucleation, growth, habit, dissolution and structure of two- and three-dimensional crystals using `tailor-made' auxiliaries

Weissbuch¹,

Popovitz‐Biro²,

Lahav³

et al. 1995

Acta Crystallogr B Struct Sci

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332

288

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Tailor-made auxiliaries for the control of nucleation and growth of molecular crystals may be classified into two broad categories: inhibitors and promoters. Tailor-made inhibitors of crystal growth can be used for a variety of purposes, which include morphological engineering and etching, reduction of crystal symmetry, assignment of absolute structure of chiral molecules and polar crystals, elucidation of the effect of solvent on crystal growth, and crystallization of a desired polymorph. As for crystal growth promoters, monolayers of amphiphilic molecules on water have been used to induce the growth of a variety of three-dimensional crystals at the monolayer-solution interface by means of structural match, molecular complementarity or electrostatic interaction. A particular focus is made on the induced nucleation of ice by mono- © 1995 International Union of Crystallography Printed in Great Britain -all fights reserved layers of water-insoluble aliphatic alcohols. The twodimensional crystalline structures of such monolayers have been studied by grazing incidence X-ray diffraction. It has become possible to monitor, by this method, the growth, dissolution and structure of self-aggregated crystalline monolayers, and indeed multilayers, affected by the interaction of solvent molecules in the aqueous subphase with the amphiphilic headgroups, and by the use of tailor-made amphiphilic additives.

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The Structure and Symmetry of Crystalline Solid Solutions: A General Revision

Cited by 100 publications

References 9 publications

(Pb1xCdx)S Nanoparticles Embedded in a Conjugated Organic Matrix, as Studied by Photoluminescence and Light-Induced X-ray Photoelectron Spectroscopy

(Pb1xCdx)S Nanoparticles Embedded in a Conjugated Organic Matrix, as Studied by Photoluminescence and Light-Induced X-ray Photoelectron Spectroscopy

Generation of Oligopeptides with Homochiral Sequences by Topochemical Reactions within Racemic Crystals of Phenylalanine‐N‐carboxyanhydride

Understanding and control of nucleation, growth, habit, dissolution and structure of two- and three-dimensional crystals using `tailor-made' auxiliaries

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