Inorganic molecular wires: Physical and functional properties of transition metal chalco-halide polymers

Mihailović, D.

doi:10.1016/j.pmatsci.2008.09.001

Cited by 69 publications

(62 citation statements)

References 69 publications

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“…[43] Recently, the "Mo 6 S 9-x -I x " (4 Ͻ x Ͻ 6) composition was proposed for such fibres, preferentially with x = 6 and 4.5, assuming the absence of the L i-i ligand (see ref. [42] ) that is not consistent with the general rules of M 6 cluster chemistry stating that each molybdenum atom of the M 6 cluster is always located in a square-pyramidal environment. Notice, that in contrast to a "Mo 6 S 4.5 I 4.5 " or "Mo 6 I 6 S 3 " composition, only the Mo 6 I 8 S 2 stoichiometry provides a pure compound when used in the starting mixture.…”

Section: D M 6 Chalcohalidesmentioning

confidence: 70%

“…Indeed, they can be dispersed in 2-propanol after ultrasonic debundling and sedimentation [41] for use as an alternative to carbon nanotubes for applications in nanotechnology (see ref. [42] and references cited within). An original use of these fibres was reported by M. Remskar et al who sulfurised the Mo 6 I 8 S 2 precursor under an H 2 /H 2 S flow in order to obtain MoS 2 nanotubes with encapsulation of MoS 2 fullerenes inside these nanotubes.…”

Section: D M 6 Chalcohalidesmentioning

confidence: 99%

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Low‐Dimensional Frameworks in Solid State Chemistry of Mo₆ and Re₆ Cluster Chalcohalides

Перрин

Perrin

2011

Eur J Inorg Chem

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International audienceA review. The low-dimensional Mo6 and Re6 cluster chalcohalides synthesized from solid-state reactions at high temp. are reviewed. Their crystal structures are described in terms of interunit connectivities involving inner and apical ligands shared between adjacent cluster units. Such architectures are controlled by the geometry of the M6L14 cluster units, the steric hindrance of the ligands linked to the M6 cluster, the specific location imposed on the halogen or chalcogen ligand and the most favorable electron count on the cluster core, considering halogen and chalcogen stoichiometries. [on SciFinder(R)

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Section: D M 6 Chalcohalidesmentioning

confidence: 70%

Section: D M 6 Chalcohalidesmentioning

confidence: 99%

Low‐Dimensional Frameworks in Solid State Chemistry of Mo₆ and Re₆ Cluster Chalcohalides

Перрин

Perrin

2011

Eur J Inorg Chem

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“…A driving motivation for this research is the perspective of designing nano-metric devices with desired optoelectronic properties, such as organic semiconductors [2][3][4], molecular wires and junctions [5][6][7]. Important applications of these studies in biophysics concern the understanding of exciton energy transfer in protein photosynthetic complexes [8][9][10][11] and the related perspective of designing biomimetic organic antennas.…”

Section: Introductionmentioning

confidence: 99%

Quantum propagation of electronic excitations in macromolecules: A computationally efficient multiscale approach

et al. 2016

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We introduce a theoretical approach to study the quantum-dissipative dynamics of electronic excitations in macromolecules, which enables to perform calculations in large systems and cover long time intervals. All the parameters of the underlying microscopic Hamiltonian are obtained from ab-initio electronic structure calculations, ensuring chemical detail. In the short-time regime, the theory is solvable using a diagrammatic perturbation theory, enabling analytic insight. To compute the time evolution of the density matrix at intermediate times, typically < ∼ ps, we develop a Monte Carlo algorithm free from any sign or phase problem, hence computationally efficient. Finally, the dynamics in the long-time and large-distance limit can be studied combining the microscopic calculations with renormalization group techniques to define a rigorous low-resolution effective theory. We benchmark our Monte Carlo algorithm against the results obtained in perturbation theory and using a semi-classical non-perturbative scheme. Then we apply it to compute the intra-chain charge mobility in a realistic conjugate polymer.

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“…Anionic bridges which bind Mo-clusters together into one-dimensional chains are extraordinarily strong, yet highly deformable, giving rise to exceptionally high Young's moduli and nonlinear mechanical properties, respectively. The very weak interaction between individual polymer chains within crystalline bundles leads to observation of extreme onedimensional electronic and magnetic character on one hand, and also to easy dispersion in common polar solvents and ultralow shear moduli on the other [3].…”

mentioning

confidence: 99%

“…Indeed a nanowire-like material with the chemical formula Mo 6 S 4.5 I 4.5 was studied as additive in the synthetic base oil, a poly-alpha-olefin (PAO), showing ultralow friction coefficient of 0.03. The remarkably low friction coefficients, which are comparable to inorganic fullerenes, are believed to be the result of debundling and transformation to MoS 2 [3,5]. MoS 2 nanotubes have only recently been synthesized in sufficient quantities for tribological studies [6], after which it was showed that they, mixed with the PAO oil, very effectively reduce the friction in the boundary-lubrication of steel surfaces with different roughness [7].…”

mentioning

confidence: 99%

Tribological properties of composites of polyamide-6 and nanotubes of MoS₂, and nanowires of MoO_(3−x)and Mo₆S₂I₈

Meier

Mrzel

Canales

et al. 2013

Phys. Status Solidi A

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Phone: þ34 976 01 1875, Fax: þ34 976 01 1888Composites of Mo 6 S 2 I 8 -nanowires, MoO (3 À x) -nanowires and MoS 2 -nanotubes with polyamide 6 (PA6) have been prepared in different concentrations up to 4% via melt-mixing using a laboratory twin screw extruder in order to investigate their tribological, mechanical and thermal properties. Chemical and structural composition of these nanowires and nanotubes with similar morphologies seem to play an important role in properties of fabricated polymer composites. Tribological tests were performed on the macroscale using a pin-on-disc (POD) tribometer and the thermal properties of the polymer nanocomposites were measured by differential scanning calorimetry to determine their glass transition temperatures and the levels of crystallinity. The behaviour of the nanowires (Mo 6 S 2 I 8 and MoO (3 À x) ) is different from the nanotubes (MoS 2 ) with respect to the induced effects on the friction coefficient and wear rate in function of concentration. The composites with the nanowires show a significant increase of the E-module of up to 38% at a nanowire concentration of 4 wt% in the glassy state of PA6, estimated from hardness measurements. The reduced friction coefficient and wear rates are related to the increased bulk shear strength of the nanowire polymer composites. In contrasts, nanotubes of MoS 2 did not show this strong reinforcement. The reduced friction coefficients and wear rates of the polymer composites with MoS 2 -nanotubes are predominantly related to the lubricating effect of the MoS 2 -nanotubes at the contact points.

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Inorganic molecular wires: Physical and functional properties of transition metal chalco-halide polymers

Cited by 69 publications

References 69 publications

Low‐Dimensional Frameworks in Solid State Chemistry of Mo₆ and Re₆ Cluster Chalcohalides

Low‐Dimensional Frameworks in Solid State Chemistry of Mo₆ and Re₆ Cluster Chalcohalides

Quantum propagation of electronic excitations in macromolecules: A computationally efficient multiscale approach

Tribological properties of composites of polyamide-6 and nanotubes of MoS₂, and nanowires of MoO_(3−x)and Mo₆S₂I₈

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Inorganic molecular wires: Physical and functional properties of transition metal chalco-halide polymers

Cited by 69 publications

References 69 publications

Low‐Dimensional Frameworks in Solid State Chemistry of Mo6 and Re6 Cluster Chalcohalides

Low‐Dimensional Frameworks in Solid State Chemistry of Mo6 and Re6 Cluster Chalcohalides

Quantum propagation of electronic excitations in macromolecules: A computationally efficient multiscale approach

Tribological properties of composites of polyamide-6 and nanotubes of MoS2, and nanowires of MoO(3−x)and Mo6S2I8

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Product

Resources

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Low‐Dimensional Frameworks in Solid State Chemistry of Mo₆ and Re₆ Cluster Chalcohalides

Low‐Dimensional Frameworks in Solid State Chemistry of Mo₆ and Re₆ Cluster Chalcohalides

Tribological properties of composites of polyamide-6 and nanotubes of MoS₂, and nanowires of MoO_(3−x)and Mo₆S₂I₈