Variable-temperature Raman and infrared spectra of the copper acetate dimer Cu2(O2CCH3)4(H2O)2 and its derivatives

Mathey, Y.; Greig, D.; Shriver, D. F.

doi:10.1021/ic00139a028

Cited by 65 publications

(54 citation statements)

References 3 publications

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“…[14] For all of the functionalized materials, the presence of the acetate ligands is clearly evidenced by the characteristic n C=O (1550-1600 cm À1 ) of the metal-bound acetate ligand. [15] Significantly, in the functionalized materials, the n C=O associated with the acetate ligands were shifted by between 20 and 60 cm À1 when compared to the parent M(OAc) 2 salts. This shift provides a strong indication of a change in the coordination environment at the metal center of the acetate salt, presumably as a result of ligation by the S donors of the 2H-MoS 2 to the metal ion.…”

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confidence: 89%

Functionalization of Liquid‐Exfoliated Two‐Dimensional 2H‐MoS₂

et al. 2015

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Exfoliation of lamellar materials into their corresponding layers represented a breakthrough, due to the outstanding properties arising from the nanometric thickness confinement. Among the cleavage techniques, liquid-phase exfoliation is now on the rise because it is scalable and leads to easy-to-manipulate colloids. However, all appropriate exfoliating solvents exhibit strong polarity, which restrains a lot the scope of feasible functionalization or processing of the resulting flakes. Here we propose to extend this scope, demonstrating that nanosheets exfoliated in a polar medium can be properly dispersed in a non-polar solvent. To that purpose, we prepared suspensions of molybdenum disulfide flakes in isopropanol/water and developed a phase transfer of the nanosheets to chloroform via precipitation and redispersion/centrifugation sequences, without any assisting surfactant. The colloidal stability of the nanosheets in chloroform was found to be governed by their lateral dimensions and, although lower than in polar media, proved to be high enough to open the way to subsequent functionalization or processing of the flakes in non-polar medium.

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confidence: 89%

Functionalization of Liquid‐Exfoliated Two‐Dimensional 2H‐MoS₂

et al. 2015

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“…These changes in the carboxylic band range at the mesophase transition are common to all the Cu(II) carboxylates (with only the exception of the propanoate member for which no mesophase exists) and have been The far-infrared spectrum of Cu(C4) 2 is very sensitive to temperature, figure 12 (b). At the first solid-solid transition (395 K), the bands assigned to Cu-O stretches at 368 and 313 cm 21 [28] decrease in intensity while Cu-Cu-O deformation modes increase and OCu-O deformations remain. This implies that the geometry of the central core is also involved in this solid-solid transition.…”

Section: Infrared and Raman Spectramentioning

confidence: 99%

Short chain copper(II)n-alkanoate liquid crystals

et al. 2004

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Four short chain members of the copper(II) n-alkanoate series Cu(Cn) 2 , from propanoate to hexanoate, have been synthesized, purified and characterized by means of optical microscopy, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), FTIR and Raman spectroscopy. The TGA study shows that decomposition starts on heating above 420-470 K (depending on the sample) in a nitrogen atmosphere. In addition, thermal decomposition was investigated by DSC using special high pressure pans and endo-and excthermic processes were found which have not been reported previously. All but one of the compounds melt to a liquid crystal phase, which decomposes before the clearing point. The exception is the propanoate homologue, which decomposes directly from the solid state. Despite this problem of sample decomposition, the identification by optical microscopy of the tetragonal (butanoate) and hexagonal (pentanoate and hexanoate) discotic columnar phases was, for first time, possible by the addition of small amounts of the corresponding acid to the samples. These results are in agreement with the X-ray diffraction study performed using swelled mixtures of these salts with hydrocarbon solvents. Two solid-solid transitions, not previously reported in the literature, were found for the butanoate homologue at 395.9 and 422.9 K with DH~8.27 and 1.37 kJ mol 21 , respectively. The solid and liquid crystalline phases were investigated using variable temperature FTIR spectroscopy.

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“…Due to a demanding procedure, only a small proportion of the compounds are analyzed this way, e.g. some general examples as copper acetate hydrate [6,7]. Alternatively, a group of relatively similar species may be isolated instead and their spectra compared, enabling thus an easier path to the IR band assignment.…”

Section: Introductionmentioning

confidence: 99%