Tuning second-order NLO responses through halogen bonding

Cariati, Elena; Forni, Alessandra; Biella, S.; Metrangolo, Pierangelo; Meyer, Franck; Resnati, Giuseppe; Righetto, Stefania; Tordin, Elisa; Ugo, R.

doi:10.1039/b702724a

Cited by 111 publications

(71 citation statements)

References 24 publications

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“…Calculations showed that the HOMO and LUMO, both -orbitals, are extended throughout the molecules, confirming an extended conjugation. The transition is associated with a chargetransfer interaction from a more polar ground state to a less polar excited state [19]. In agreement with the two state model mentioned above, positive values of hyperpolarizability in CHCl 3 were observed (μ for 10, 11, 12 are +124, +192, +173 x 10 -48 esu, respectively).…”

Section: Noncovalent Assembly As a Tool For Enhancing Eo Response In supporting

confidence: 69%

Acentric Nanostructured Assembly as a Strategy for the Design of Organic Electrooptic Materials

Coluccini¹,

Pasini

2008

TOCMPJ

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Abstract:The rational utilization of the paradigms of self-assembly and self-organization, essential requisites for the building up of the architectural complexity found in natural systems, is becoming an unavoidable strategy in the world of nanosciences. Recent developments in the field of organic materials for second-order nonlinear optics have focused in the recent past not only towards the optimization of the molecular engineering translating into ultrahigh molecular hyperpolarizabilities, but also, and more fundamentally, towards the realization of acentric assemblies of such chromophores into nanomaterials with high electrooptic responses. Selected, recent examples dealing with these concepts are discussed.

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Section: Noncovalent Assembly As a Tool For Enhancing Eo Response In supporting

confidence: 69%

Acentric Nanostructured Assembly as a Strategy for the Design of Organic Electrooptic Materials

Coluccini¹,

Pasini

2008

TOCMPJ

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“…It is increasingly recognised that this interaction plays an important role in molecular recognition, biochemical processes and supramolecular chemistry. The applications include liquid crystals [2] and materials with specific non-linear optical [3,4] or magnetic [5,6] properties. In addition, halogen bonding plays a key role in the field of drug design [7,8] and protein-ligand complexation [9,10].…”

Section: Introductionmentioning

confidence: 99%

A 19F NMR study of C–I⋯π halogen bonding

et al. 2011

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“…The presence of the electron-withdrawing fluorines strongly enhances the electron acceptor ability of the organic iodine and in addition minimizes the interferences from the other weak interactions, the C-F groups being very insensitive to the interaction with other functional groups. This has permitted their application to dictate the arrangement of molecules for topological reactions in the solid state [30], for the creation of binding sites in crosslinked polymers [31], for layer-by-layer assembly of two polymers [32], for the design nonlinear optical materials [33] and liquid crystals [34], as anion receptors [35], for chiral resolution [36], for complex radicals to tune the magnetic interactions [37], and also for the controlled growth of thin films [38]. Nevertheless, the effectiveness of halogen bonds are not restricted to the use of haloperfluorocarbons; activation of the halogens can also be achieved by other means, such as sp hybridization of the carbon atom attached to the halogen or use of positively charged molecules, leading to novel materials with interesting properties.…”

Section: Halogens As Electrophilesmentioning

confidence: 99%

Supramolecular Interactions and Smart Materials: C–X…X′–M Halogen Bonds and Gas Sorption in Molecular Solids

Espallargas

2010

Ideas in Chemistry and Molecular Sciences

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The ultimate goal of a solid-state chemist is the rational design and synthesis of crystalline materials with the presence of specific and tunable chemical or physical properties, the so-called ''smart materials.'' Porosity, magnetism, chirality, conductivity, superconductivity, spin-transition, optical, and photophysical properties can be exploited for a wide variety of applications including gas storage, separations, electronic, catalysis, nonlinear optics, or drug delivery, and are therefore the objectives of intense research activity. The occurrence of these properties in crystalline materials 1) results from the combination of two aspects: (i) the molecular units (building blocks) that compose the crystal and (ii) the arrangement of these building blocks in the crystal. Controlling the former is relatively simple, and essentially it is only limited to the imagination and creativity of the researcher, since molecular chemistry has, over about two centuries, developed a wide range of very powerful procedures for creating even more sophisticated molecules from atoms linked by covalent bonds. On the contrary, organizing the molecules, or building blocks, in a predetermined manner is difficult to accomplish given that the structure of crystalline solids results from a delicate balance between all the intermolecular interactions present in the crystal, maximizing the attractive ones and minimizing the repulsive ones while, although not always, adopting the densest packing [1]. When a single strong interaction dominates in the system other weak intermolecular interactions normally play a secondary role in the crystal packing, providing support to the stronger interactions. In this situation, control over the molecular packing can successfully be achieved [2], although the presence of numerous weak interactions can in some cases overwhelm much stronger interactions as a result of their abundance [3]. Further difficulties can be encountered if the building blocks are 1) It should of course be acknowledged that crystalline products might not always represent the most desirable form of a material with respect to a given application.

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Tuning second-order NLO responses through halogen bonding

Cited by 111 publications

References 24 publications

Acentric Nanostructured Assembly as a Strategy for the Design of Organic Electrooptic Materials

Acentric Nanostructured Assembly as a Strategy for the Design of Organic Electrooptic Materials

A 19F NMR study of C–I⋯π halogen bonding

Supramolecular Interactions and Smart Materials: C–X…X′–M Halogen Bonds and Gas Sorption in Molecular Solids

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