Self-assembly of 1,4-cis-polybutadiene and an aromatic host to fabricate nanostructured crystals by CH⋯π interactions

Bracco, Silvia; Comotti, Angiolina; Valsesia, Patrizia; Beretta, Mario; Sozzani, Piero

doi:10.1039/c002931a

Cited by 25 publications

(11 citation statements)

References 40 publications

(1 reference statement)

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“…Besides differentiating between monoclinic and hexagonal TPP, solid-state NMR is also able to determine which parts of a proton-containing guest molecule are inserted into TPP channels and which parts remain outside, because the chemical shifts of NMR-active atoms are exquisitely sensitive to their environment. The ring currents produced by the benzene rings in TPP are known to modify chemical shifts by several ppm, thus allowing the inclusion to be easily recognized Reproduced with permission from [43] 180 K. Zhao et al [50][51][52][53][54][55][56][57]. For a detailed analysis it is necessary to first secure a full assignment for all NMR-active nuclei of the guest rotor molecule from a study of its solution or solid NMR spectrum.…”

Section: Solid-state Nuclear Magnetic Resonance (Ssnmr)mentioning

confidence: 99%

Arrays of Dipolar Molecular Rotors in Tris(o-phenylenedioxy)cyclotriphosphazene

Zhao

Dron

Kaleta

et al. 2014

Molecular Machines and Motors

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Regular two-dimensional or three-dimensional arrays of mutually interacting dipolar molecular rotors represent a worthy synthetic objective. Their dielectric properties, including possible collective behavior, will be a sensitive function of the location of the rotors, the orientation of their axes, and the size of their dipoles. Host-guest chemistry is one possible approach to gaining fine control over these factors. We describe the progress that has been achieved in recent years using tris (o-phenylenedioxy)cyclotriphosphazene as a host and a series of rod-shaped dipolar molecular rotors as guests. Structures of both surface and bulk inclusion compounds have been established primarily by solid-state nuclear magnetic resonance (NMR) and powder X-ray diffraction (XRD) techniques. Low-temperature dielectric spectroscopy revealed rotational barriers as low as 1.5 kcal/mol, but no definitive evidence for collective behavior has been obtained so far.

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Section: Solid-state Nuclear Magnetic Resonance (Ssnmr)mentioning

confidence: 99%

Arrays of Dipolar Molecular Rotors in Tris(o-phenylenedioxy)cyclotriphosphazene

Zhao

Dron

Kaleta

et al. 2014

Molecular Machines and Motors

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“…The lattice constant is 11.5–12 Å, depending on the guest. The internal channel diameter is 4.5–5 Å, permitting easy entry of linear alkanes, benzene, etc 35–44. The crystal consists of layers ≈5 Å thick.…”

Section: Methodsmentioning

confidence: 99%

Inclusion Compound Based Approach to Forming Arrays of Artificial Dipolar Molecular Rotors: A Search for Optimal Rotor Structures

et al. 2012

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Hexagonal tris(o-phenylenedioxy)cyclotriphosphazene (TPP) is used as ahost for organizing dipolar molecular rotor guests into regular trigonal arrays. Inclusion of molecular rotors with transversely dipolar rotators into TPP channels is followed by solid-state nuclear magnetic resonance, diifferential scanning calorimetry, X-ray diffraction, and dielectric spectroscopy. The more polar of the two rotors does not form an inclusion. The second rotor forms two different inclusions differing in crystallite size and the rotational barriers.

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“…Finally, on the basis of the obtained results, the interfacial structure of the investigated nanocomposite was proposed. Similar approach, utilizing 1 H MAS, 1 H-13 C and 1 H-31 P PMLG-HETCOR recorded under fast MAS condition (PMLG = Phase Modulated LeeGoldburg), was applied by Bracco et al [22] for investigation of the self-assembly of the new composite consisting of 1,4-cis-polybutadiene and tris-(o-phenylenedioxy)spirocyclotriphosphazene. Advanced SSNMR techniques allowed description in detail the role of the weak CH … π interactions cooperating to fabricate polymer nanostructured materials: those interactions stabilize the crystalline host and a rubbery polymer supramolecular crystals.…”

Section: Very Fast Magic Angle Spinning Solid State Nuclear Magnetic mentioning

confidence: 99%

Modern solid state NMR techniques and concepts in structural studies of synthetic polymers

Kaźmierski

Pawlak

Jeziorna

et al. 2016

Polym. Adv. Technol.

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In this mini-review, we present the solid state nuclear magnetic resonance (NMR) methods which trace the new tendency in structural studies of synthetic polymers. The review is organized into three sections. In the first part, short theoretical background and introduction to very fast magic angle spinning NMR technique with sample rotation 60 kHz are shown. The second part presents method for enhancing the sensitivity of NMR experiments by application of dynamic nuclear polarization magic angle spinning technique. In the third section, the power of the NMR crystallography approach which can be used for fine refinement of polymers structure on the atomic level is discussed.

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Self-assembly of 1,4-cis-polybutadiene and an aromatic host to fabricate nanostructured crystals by CH⋯π interactions

Cited by 25 publications

References 40 publications

Arrays of Dipolar Molecular Rotors in Tris(o-phenylenedioxy)cyclotriphosphazene

Arrays of Dipolar Molecular Rotors in Tris(o-phenylenedioxy)cyclotriphosphazene

Inclusion Compound Based Approach to Forming Arrays of Artificial Dipolar Molecular Rotors: A Search for Optimal Rotor Structures

Modern solid state NMR techniques and concepts in structural studies of synthetic polymers

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