Étude, par spectroscopie de vibration, de deux solvants de la cellulose: La <i>N</i>-méthyl morpholine <i>N</i>-oxyde et son monohydrate

Maï, Pham Thi; Herzog-Cance, M.H.; Potier, A.; Potier, J.

doi:10.1139/v82-399

Cited by 15 publications

(1 citation statement)

References 6 publications

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“…This was confirmed through an analysis of calculated vibrational modes with DFT, pointing toward 6 as containing a noticeably weaker N−O stretch. NMMO features two N−O stretching modes as discussed previously, 46 and the spectra of 7−9 show that the lower energy N−O stretch has been weakened by ca. 30 cm −1 (Table 4).…”

Section: ■ Results and Discussionsupporting

confidence: 68%

Synthesis and Characterization of Tellurium Catecholates and Their N-Oxide Adducts

et al. 2021

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Tellurium catecholate complexes were investigated to probe the redox chemistry of tellurium, whose oxidation state can span from −2 to +6. Treating TeO 2 with catechols resulted in tellurium coordination complexes in high yields within minutes to hours at room temperature or with extended heating, depending on the ligand substituents, giving Te(IV) complexes of the form Te(C) 2 , where C = 3,5-di-tert-butylcatecholate, ocatecholate, or tetrachlorocatecholate. The redox behavior of these complexes was investigated through addition of organic oxidants, giving nearly quantitative adducts of pyridine N-oxide or N-methylmorpholine Noxide with each tellurium complex, the latter set leading to ligand oxidation upon heating. Each compound was characterized crystallographically and computationally, providing data consistent with a mostly electrostatic interaction and very little covalent character between the N-oxide and Te complex. The Te N-oxide bond orders are consistently lower than those with the catechol derivatives, as characterized with the Mayer, Gopinathan−Jug (G-J), and first Nalewajski−Mrozek (N-M1) bond indices. The tellurium lone pair is energetically buried by 1.93−2.81 eV, correlating with the observation that the ligands are more reactive than the tellurium center toward oxidation. This combined experimental and theoretical study finds structure−property relationships between ligand design and reactivity that will aid in future efforts for the recovery of tellurium.

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Section: ■ Results and Discussionsupporting

confidence: 68%

Synthesis and Characterization of Tellurium Catecholates and Their N-Oxide Adducts

et al. 2021

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Untersuchungen zur Auflösung der Cellulose in binären aprotischen Systemen. 3. Mitt. Untersuchungen über Wechselwirkungen zwischen einzelen Lösungsmittelkomponenten für Cellulose und Überlegungen zum Lösemechanismus

et al. 1990

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Professor Dr. Josef Schurz zum 65. Geburtstag gewidmet Es werden Aussagen zu den Wechselwirkungen zwischen N-Methylmorpholin-N-oxid und einer zweiten protischen oder aprotischen Losungsmittelkomponente fur Cellulose getroffen. Als Untcrsuchungsmethoden dienten DSC-, 'H-NMR-, FTIR-und RWWS-Messungen. Um den Celluloselosemechanismus zu erklaren, wurden einige Modellsubstanzen rnit OH-Gruppen in binaren Systemen rnit NMMNO untersucht. Die hier und in fruheren Mitteilungen erhaltenen experimentellen Ergebnisse werden hinsichtlich der Losewirkung von Mischungen aus NMMNO .I H,O und unterschiedlichen Zweitkomponenten gegenuber Cellulose zusammenfassend diskutiert. mccneaoeanu pacmeopenus ~e~znwn03b~ 8 6unapnaix anpomuuecmx cucmeaax. 3 . C00624. Nccnedoeanm eaaumoaefic m e u mmcay ornaefibnacau komnonenmuu pacmeopumeneii an8 yennwnoaac u 06 yaicaenm o mexanuaae pacmeopenm PaCCMaTpHBaeTCH B3aWMOAe&CTBHe MeHtAY N -M e T H J I M O p~O J I H H -N -O K C~A O M (NMMNO) H BTOPHM IIPOTHYeCKHM HJIH aIIpOTHYeCKHM KOMIIOHeHTOM PaCTBOpllTeJIH AJIH UeJIJIIoJI03E.I. MCCJIeAOBaHHH IIpOBOAHJIHCb C lXOMOLQbI0 ACH, 'H-HMP, @T~~-CIIeKTpOCKOIIHH I4 MeTOAOM PaCCeHHElH PeHTreHOBCHHX JIyYei H a 6 o n b r u~x YrJIaX. q~0 6 b 1 BPHCHHTb MeXaHH3M PaCTBOPeHHH qeJIJIIOJI03bI HCCJIeAOBaJIH HeKOTOpbIe MOAeJIbHbIe BeLQeCTBa C OH-rpynnaME B ~IIHIPHUX CHCTeMaX C NMMNO. nOJIyYeHHbIe B A a H H O i W B IIpeAbIAyQHX patjo~ax pe3yJIbTaTbI 0 6 c y x f l a 1 0~c~ OTHOCHTeJIbHO paCTBOpFIIOQe2f CnOCO6HOCTH AJIH qeJIJIIoJI03bI CMeCefi NMMNO * 1 HzO C paaJIH'4HbIMki KOMIIOHeHTaMH. Investigation of the solution of cellulose in binary aprotic systems. 3rd Comm. Study of the interaction between the individual solvent components and discussion of the solution mechanismInteractions between N-methylmorpholine-N-oxide and a second protic or aprotic solvent component for cellulose are considered. For the experimental investigations DSC, lH-NMR spectroscopy, FTIR spectroscopy, and WAXS were employed. To obtain informations on the mechanism of cellulose dissolution, some model compounds containing OHgroups were investigated in the appropriate binary solvent systems. The results obtained here and in our previous publications are discussed with regard to the solvent action of binary systems with NMMNO.1 H,O on cellulose.

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Untersuchungen zur Auflöusung von Cellulose in binäuren aprotischen Systemen. 4. Mitt.: Synthese neuer Aminoxide und Löuslichkeit eines Textilzellstoffs in Aminoxiden bzw. in binären Systemen mit Aminoxid als einer Komponente

1990

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Herrn Professor Dr. habil. Burkart Philipp zum 65. Geburtstag gewidmet Neue Aminoxide wurden zur Priifung ihrer Losewirkung gegeniiber Cellulose synthetisiert und mit N-Methylmorpholin-N-oxid (NMMNO . H,O) verglichen. Untersucht wurde die Auflosung der Cellulose in aprotischen, 0-basischen Losungsmittelsystemen, insbesondere in binaren Gemischen aus NMMNO. H,O rnit einer meist aprotischen Zweitkomponente. Das Celluloseausgangsmaterial und dessen Struktur wurden variiert. Hccfieaoeanua pacmeopenua qe~z~zloso3u e 6unap~bzx anponzonmx eucmeaax. 4 . C006u4.: C u~m e a noebzx ocuceii a&unoe u pacmeopu&ocmb memmumnoii ye~z~ziono3bc e ORUCRX aMui4oe w u e 6UMUpRbLX cuemeMax c oxucbw m u n a e xauecmee oanozo u3 Eofinonenmoe CHHTeTM3HPOBaJIACb HOBbIe OKMCM aMAHOB. H X paCTBOpRIoqaR c n o c o 6~o c~b HJIR qenJIIOJI03bI CpaBHMBaJIaCb C N-MeTMn-MOp~OnMH-N-OKCElAOM. BCCJleGOBaJIOCb TBHFKe PaCTBOpeHMe UeJIJIIOJIO3bI B aIIpOTOHHbIX, 0-OCHOBHbIX CMeCRX PaCTBOpHTeJIefi, s a q e BCeT'O B ABYXKOMIIOHeHTHbIX CHCTeMaX 1.13 OKMCM a M H H a M aIIpOTOHHOT'0 BTOpOrO KOMIIOHC?HTa. BapbMpOBaJIM HcxoAHbrii MaTepaan qenn1ono3b1 IT ee CTPYKTYPY. Investigation of the solution of cellulose in binary aprotic systems. 4th Comm. Synthesis of new amine oxides and the solubility of textile pulp in amine oxides and in binary systems with amine oxide as the one component Some new amine oxides have been synthesized. Their ability to dissolve cellulose was tested in comparison with Nmethylmorpholin-N-oxide (NMMNO . H,O). Further the dissolution of cellulose in aprotic O-basic solvent systems, especially in binary mixtures of NMMNO * H,O and a mainly aprotic second component, was investigated. Different cellulose materials with varying structure was used.

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Étude, par spectroscopie de vibration, de deux solvants de la cellulose: La N-méthyl morpholine N-oxyde et son monohydrate

Cited by 15 publications

References 6 publications

Synthesis and Characterization of Tellurium Catecholates and Their N-Oxide Adducts

Synthesis and Characterization of Tellurium Catecholates and Their N-Oxide Adducts

Untersuchungen zur Auflösung der Cellulose in binären aprotischen Systemen. 3. Mitt. Untersuchungen über Wechselwirkungen zwischen einzelen Lösungsmittelkomponenten für Cellulose und Überlegungen zum Lösemechanismus

Untersuchungen zur Auflöusung von Cellulose in binäuren aprotischen Systemen. 4. Mitt.: Synthese neuer Aminoxide und Löuslichkeit eines Textilzellstoffs in Aminoxiden bzw. in binären Systemen mit Aminoxid als einer Komponente

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