Macrocyclic Oligo-ethers Related to Ethylene Oxide.

Dale, Johannes; Kristiansen, Per Olav; Henriksen, Lars; Liaaen‐Jensen, S.; Svensson, Sigfrid

doi:10.3891/acta.chem.scand.26-1471

Cited by 197 publications

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“…The measured density and the absence of residual peaks in the final (Fo-Fc) synthesis show that the crystals described here are anhydrous, in contrast to the monohydrate described by Dale & Kristiansen (1972). …”

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confidence: 70%

Rubidium thiocyanate complex of 1,4,7,10,13,16-hexaoxacyclooctadecane

Dobler¹,

Phizackerley²

1974

Acta Crystallogr Sect B

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confidence: 70%

Rubidium thiocyanate complex of 1,4,7,10,13,16-hexaoxacyclooctadecane

Dobler¹,

Phizackerley²

1974

Acta Crystallogr Sect B

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“…IR spectra of symmetric complexes such as M+-18-crown-6.~r-contain two singlets in the 800-1000 cm-' region: CH2 rocking at 960 cm-' and C-C stretching at 835 cm-' (17,18) …”

Section: Spectroscopymentioning

confidence: 99%

The crystal and molecular structures of two isostructural complexes: [(H₃O•18-crown-6)₂(ZnCl₄)] and [(H₃O•18-crown-6)₂(MnCl₄)]

Chênevert¹,

Chamberland²,

Simard³

et al. 1990

Can. J. Chem.

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. Can. J. Chem. 68, 797 (1990) New macrocycle polyether 18-crown-6 complexes of stoichiometry [(H30+. 1 8 -~r o w n -6 )~(~C l~~-) ] have been synthesized for M = Zn and Mn. The two complexes are isostructural and crystallize in the monoclinic system, space group C2/c. The unit cell dimensions are as follows: a = 16.229(9), b = 11.535(3), c = 20.134(8) A, P = 97.55(4)" and a = 16.255(6), b = 11.625(3), c = 20.122(8) A, P = 96.54(3)" for the Zn and Mn complexes respectively. In both crystal structures (final R,, = 0.048 with 1817 reflections for Zn and R, = 0.074 with 728 reflections for Mn), the crown ether molecule and the H30+ cation to which it is hydrogen-bonded are disordered over two sites. The M C~~~-anions, which have tetrahedral toordination, are on crystallographic twofold axes of rotation. The Mn-Cl and Zn-C1 distances average 2.270 and 2.361 A respectively. The hydronium cation, H30+, has pyramidal coordination. Of the two disordered crown ether molecules in the Zn and the Mn complexes, one has a slightly deformed (ttg)6 conformation while the other one may be described as having the distorted (ttg)5(ttc) conformation. These observations are in agreement with the infrared analyses of the complexes.Key words: 18-crown-6 complexes, hydronium ion, ~n C l~~-, M~c I~~-, crystal structure. pyramidale. Des deux molCcules dlCthers couronnes dtsordonnCes qui sont prksentes dans les complexes du Zn et du Mn, l'une posskde une conformation 1Cgkrement dCformCe (ttg)6 alors que l'on peut dtcrire la conformation dCformCe de l'autre par ( t~)~( t t c ) .Ces observations sont en accord avec les analyses infrarouges de ces complexes. Mots clis : complexes 18-couronne-6, ion hydronium, znC14'-, MnC142-, structure cristalline.[Traduit par la revue]

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“…sponding nitrosonium con~plex, some weak extra features are present, for example at 964 cm-' and in the 835 cnl-' region. The infrared spectra of both complexes also show weak bands, such as those at 1482 and 826 cm-', which do not appear to be present in the spectra of the KBr and alkaline thiocyanate complexes (10,20,21). (A stronger peak at 743 cnl-' in the spec& of both complexes is left-unexplained as it does not belong to any of the known vibrations of the species present in these compounds.)…”

Section: Resultsmentioning

confidence: 99%

“…This is also the case with the KBr complex, whose infrared ( 10,20,21) and Raman ( 10) spectra have been extensively studied, and with the nitromethane. 18C6 complex whose single crystal spectrum has been reported (22).…”

Section: Resultsmentioning

confidence: 99%

Synthesis and vibrational spectra of 1:1 stoichiometric complexes of nitronium and nitrosonium tetrafluoroborate with 18-crown-6

Savoie¹,

Pigeon-Gosselin²,

Rodrigue³

et al. 1983

Can. J. Chem.

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The macrocyclic ether 18-crown-6 can form 1: 1 stoichiometric complexes with NOBF4 and NO2BF4. These complexes, which are soluble in organic media, have been isolated and studied by infrared and Raman spectroscopy. The spectra suggest that the conformation of the ether in these complexes is essentially that of the highly regular crown of D3d symmetry, the NO+ and NO2+ ions being stuck into the ether cavity.

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Macrocyclic Oligo-ethers Related to Ethylene Oxide.

Cited by 197 publications

References 0 publications

Rubidium thiocyanate complex of 1,4,7,10,13,16-hexaoxacyclooctadecane

Rubidium thiocyanate complex of 1,4,7,10,13,16-hexaoxacyclooctadecane

The crystal and molecular structures of two isostructural complexes: [(H₃O•18-crown-6)₂(ZnCl₄)] and [(H₃O•18-crown-6)₂(MnCl₄)]

Synthesis and vibrational spectra of 1:1 stoichiometric complexes of nitronium and nitrosonium tetrafluoroborate with 18-crown-6

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Macrocyclic Oligo-ethers Related to Ethylene Oxide.

Cited by 197 publications

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Rubidium thiocyanate complex of 1,4,7,10,13,16-hexaoxacyclooctadecane

Rubidium thiocyanate complex of 1,4,7,10,13,16-hexaoxacyclooctadecane

The crystal and molecular structures of two isostructural complexes: [(H3O•18-crown-6)2(ZnCl4)] and [(H3O•18-crown-6)2(MnCl4)]

Synthesis and vibrational spectra of 1:1 stoichiometric complexes of nitronium and nitrosonium tetrafluoroborate with 18-crown-6

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The crystal and molecular structures of two isostructural complexes: [(H₃O•18-crown-6)₂(ZnCl₄)] and [(H₃O•18-crown-6)₂(MnCl₄)]