Vibrational study of (CH3)4NSbCl6 and [(CH3)4N]2SiF6

Ouasri, Ali; Rhandour, A.; Dhamelincourt, Marie Claire; Dhamelincourt, P.; Mazzah, Ahmed

doi:10.1016/s1386-1425(02)00019-7

Cited by 57 publications

(25 citation statements)

References 15 publications

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“…(Namduri and Nasrazadani 2008). Typical band for TMAOH at 944 cm -1 (Fig 2A-a), characteristic of the asymmetric methyl deformation mode of C-N on TMAOH (Ouasri et al 2002), was found to shift to 975 cm -1 ( Fig. 2A-c), indicating the existence of TMAOH on T-SPIONs.…”

Section: Synthesis and Characterization Of C-spions And T-spionsmentioning

confidence: 93%

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Enhanced stability of superparamagnetic iron oxide nanoparticles in biological media using a pH adjusted-BSA adsorption protocol

Laromaine

Roig

2014

J Nanopart Res

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Superparamagnetic iron oxide nanoparticles (SPIONs) are widely used for biological applications due to their unique properties compared to their bulk counterparts, simplified SPIONs stabilization protocols applicable for a wide spectra of biological media remains a challenging issue. In this work, SPIONs with different surface coatings, tetramethylammonium hydroxide coated SPIONs (T-SPIONs) and citrate coated SPIONs (C-SPIONs), were synthesized by a facile, rapid and cost effective microwave assisted method. CSPIONs show robust stability in biological media of PBS and RPMI, while destabilize in DMEM. T-SPIONs were found to aggregate rapidly and significantly in all tested media. Then, a modified pH adjusted-BSA adsorption protocol and an addition of excess trisodium citrate dihydrate (Na 3 Cit) were used to enhance their stability in the media. The BSA adsorption protocol showed great efficiency in stabilizing the dispersed state of both SPIONs in the tested media, while the addition of excess Na 3 Cit showed limit effect, and it was only applicable for C-SPIONs. The formed BSA layer on SPIONs could be imaged by negative staining TEM, and revealed by Cryo-TEM, FTIR, DLS and the zeta potential measurements. Results indicated that BSA forms a monolayer of a thickness of about 3 ± 1 nm and BSA interacts with C-SPIONs and T-SPIONs through the coating of the SPIONs, rather than by replacing them and interacting directly with the SPIONs surface. This synthetic method and stabilization protocol offer a general methodology to obtain SPIONs with a variety of surfactants, stable in different biological media in few minutes.

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Section: Synthesis and Characterization Of C-spions And T-spionsmentioning

confidence: 93%

“…Fig. 2A-d) shows an adsorption band at 975 cm -1 , this band is assigned to the asymmetric methyl deformation mode C-N on TMAOH (Ouasri et al 2002), though with 30 nm shift from 944 cm -1 . Another band also appears at 1394 cm -1 ( Fig.…”

Section: Characterization Of Bsa Layer On C-spions and T-spionsmentioning

confidence: 98%

Enhanced stability of superparamagnetic iron oxide nanoparticles in biological media using a pH adjusted-BSA adsorption protocol

Laromaine

Roig

2014

J Nanopart Res

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“…The broadening and the shift to high wavenumbers of these bands could be indicative of the formation of hydrogen bonds inside the compound, as has been reported for several halometallate compounds. 21 In the 2800-3000 cm 1 region, four bands were observed which were assigned to the CH 3 and CH 2 asymmetric stretching modes. Two weak and broad bands observed at 2739 and 2786 cm 1 were assigned to nonfundamental modes, likely to be overtones and harmonics of the CH 3 and CH 2 bending modes.…”

Section: N-c 4 H 9 Nh 3 + Internal Vibrational Modesmentioning

confidence: 98%

“…Nevertheless, these last bands have higher intensity, certainly due to hydrogen bonding within other compounds. 21,22 The broad band of medium intensity located near 1605 cm 1 was assigned to the NH 3 asymmetric bending mode, whereas the asymmetric bands observed between 1477 and 1400 cm 1 were assigned Figure 2. Temperature evolution of the n-C 4 H 9 NH 3 2 SiF 6 Raman spectra 200-950 cm 1 between ambient temperature and 223 K. In the low-wavenumber range, the bands located near 125 cm 1 were assigned to the CH 3 and CH 2 torsional modes, although they could also be assigned to lattice modes.…”

Section: N-c 4 H 9 Nh 3 + Internal Vibrational Modesmentioning

confidence: 99%

“…The Raman band assignments, presented in Table 1, were essentially made by comparison with work carried out previously on other alkylammonium compounds 15 -19 and on hexafluorosilicate salts. 20,21 The Raman spectra are divided into three wavenumber regions (200-950, 1000-1700 and 2800-3200 cm 1 ) and are given in Figs 2, 3 and 4, respectively.…”

Section: Raman Spectrum Of (N-c 4 H 9 Nh 3 / 2 Sif 6 At Room Temperaturementioning

confidence: 99%

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Structural phase transition in (n‐C₄H₉NH₃)₂SiF₆: DSC and Raman studies

Jeghnou

Ouasri

Rhandour

et al. 2003

J Raman Spectroscopy

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Butylammonium hexafluorosilicate, (n-C 4 H 9 NH 3 ) 2 SiF 6 , crystallizes at room temperature in the trigonal system with a probable space group P321. A new structural phase transition was detected at low temperatures for this compound by means of differential scanning calorimetry (DSC) and the basic thermodynamic data for this transition were determined. The internal vibrational modes of (n-C 4 H 9 NH 3 ) 2 SiF 6 were studied at ambient temperature and as a function of the temperature, through the phase transition, by means of Raman spectroscopy. The observed phase transition is associated with the dynamics of the system and is of the order-disorder type.

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Thermal stability, low gap energy and high Temperature order–disorder Phase Transition in Hybrid Material: [N (CH₃)₄]₂PdCl₄

Dakhlaoui

Karoui

Jomni

2020

Applied Organom Chemis

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The crystal compound [N (CH3)4]2PdCl4 was crystallized in the orthogonal system and the space group is P4/mmm and the refined unit cell parameters are a = b = 8.831 Å, c = 11.415 Å. The structure, vibrational spectra and optical properties have been investigated. DSC studies indicate the presence of two phase transitions at higher temperature which confirm the thermal stability of the palladium‐based compound. These transitions have been studied by Raman scattering on single crystals as a function of temperature which confirmed their nature. The assignment of the observed bands is discussed based in the theoretical calculated frequencies by the density functional theory (DFT) method using B3LYP/LanL2DZ basis in the GAUSSIAN‐09 package of programs. The optical properties in the UV–visible region have been deduced and the energy gap has been determined which is equal to 3.11 eV.

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Vibrational study of (CH3)4NSbCl6 and [(CH3)4N]2SiF6

Cited by 57 publications

References 15 publications

Enhanced stability of superparamagnetic iron oxide nanoparticles in biological media using a pH adjusted-BSA adsorption protocol

Enhanced stability of superparamagnetic iron oxide nanoparticles in biological media using a pH adjusted-BSA adsorption protocol

Structural phase transition in (n‐C₄H₉NH₃)₂SiF₆: DSC and Raman studies

Thermal stability, low gap energy and high Temperature order–disorder Phase Transition in Hybrid Material: [N (CH₃)₄]₂PdCl₄

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Vibrational study of (CH3)4NSbCl6 and [(CH3)4N]2SiF6

Cited by 57 publications

References 15 publications

Enhanced stability of superparamagnetic iron oxide nanoparticles in biological media using a pH adjusted-BSA adsorption protocol

Enhanced stability of superparamagnetic iron oxide nanoparticles in biological media using a pH adjusted-BSA adsorption protocol

Structural phase transition in (n‐C4H9NH3)2SiF6: DSC and Raman studies

Thermal stability, low gap energy and high Temperature order–disorder Phase Transition in Hybrid Material: [N (CH3)4]2PdCl4

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Structural phase transition in (n‐C₄H₉NH₃)₂SiF₆: DSC and Raman studies

Thermal stability, low gap energy and high Temperature order–disorder Phase Transition in Hybrid Material: [N (CH₃)₄]₂PdCl₄