Competing Na+ Solvation: Ether-Shared and Ether-Separated Triple Ions of Perylene Dianion

1995 ◽  
Vol 117 (13) ◽  
pp. 3869-3870 ◽  
Author(s):  
Hans Bock ◽  
Christian Naether ◽  
Zdenek Havlas
Keyword(s):  
Triple Ions

IR study of solutions of lithium trifluoroacetate in non-aqueous solvents. Structure of ion pairs and triple ions

1975 ◽  
Vol 32 (3) ◽  
pp. 462-465 ◽  
Author(s):  
A. Regis ◽  
J. Corset
Keyword(s):  
Ion Pairs ◽  
Triple Ions ◽  
Ir Study

scholarly journals A Study of Alkali Halide Triple Ions by Fast Atom Bombardment and Collisionally Activated Dissociation Mass Spectrometry.

2001 ◽  
Vol 49 (2) ◽  
pp. 51-60 ◽  
Author(s):  
Nora MARTINEZ ◽  
Kimio ISA ◽  
Ryuji NAKATA ◽  
Kazunaka ENDO
Keyword(s):  
Mass Spectrometry ◽  
Alkali Halide ◽  
Fast Atom Bombardment ◽  
Collisionally Activated Dissociation ◽  
Triple Ions

The trifluoroacetic acid solvent system. Part V. Cryoscopic measurements

1976 ◽  
Vol 54 (19) ◽  
pp. 3031-3037 ◽  
Author(s):  
Michael G. Harriss ◽  
John B. Milne
Keyword(s):  
Trifluoroacetic Acid ◽  
Dissociation Constants ◽  
Freezing Point ◽  
Solvent System ◽  
Ion Pair ◽  
Conductivity Measurements ◽  
Cast Doubt ◽  
System Part ◽  
Triple Ions ◽  
Cryoscopic Constant

Measurement of freezing point depressions for the non-electrolytes, CCl4. CH3SO2F, and (CF3CO)2O permit calculation of the cryoscopic constant for trifluoroacetic acid, HOTFA. Water is shown to give freezing point depressions lower than those for non-electrolytes and this is attributed to association. Freezing point depressions for NaOTFA, KOTFA, and CsOTFA have been measured and accounted for in terms of ion-pair dissociation constants previously determined from electrical conductivity measurements. The results cast doubt on the existence of triple ions in this solvent.

E. s. r. and ionic association. Formation of ion pairs and triple ions of 9,10-anthrasemiquinone

1970 ◽  
Vol 66 ◽  
pp. 2420 ◽  
Author(s):  
T. E. Gough ◽  
P. R. Hindle
Keyword(s):  
Ion Pairs ◽  
Ionic Association ◽  
Triple Ions

ChemInform Abstract: FAR-INFRARED SPECTRA OF ALKALINE EARTH FLUORENONE TRIPLE IONS IN SOLUTION

1980 ◽  
Vol 11 (34) ◽  
Author(s):  
S. KONISHI ◽  
Y. MORIOKA ◽  
I. NAKAGAWA
Keyword(s):  
Infrared Spectra ◽  
Alkaline Earth ◽  
Far Infrared ◽  
Triple Ions ◽  
Far Infrared Spectra

An ESR investigation of triple ions derived from 1,2,4,5-tetramesitoylbenzene

Tetrahedron ◽  
1981 ◽  
Vol 37 (3) ◽  
pp. 605-609 ◽  
Author(s):  
M. Celina ◽  
R.L.R. Lazana ◽  
Bernardo J. Herold ◽  
Neil M. Atherton
Keyword(s):  
Triple Ions

Bicyclo[3.2.1]octa-2,6-dienyllithium and -potassium Chemistry Solvation, Aggregation, and 119Sn-7Li Coupling of Stannylated Derivatives

1990 ◽  
Vol 45 (6) ◽  
pp. 848-856 ◽  
Author(s):  
Norbert Hertkorn ◽  
Frank H. Köhler
Keyword(s):  
Nmr Spectra ◽  
Ion Pair ◽  
Lithium Cation ◽  
H Nmr ◽  
Triple Ions ◽  
Nmr Signals ◽  
Independent Confirmation ◽  
Triple Ion ◽  
C Nmr ◽  
Very Low Temperature

The 13C NMR spectra of bicyclo[3.2.1]octa-2,6-dienyl anion (1) as the lithium (1 Li) and the potassium salt (1 K) were recorded at various temperatures and in different solvents. The results show 1K to exist as a contact ion pair (CIP), whereas for 1 Li solvent separated ions (SSIP) are also found as the temperature is lowered and when the solvating power of the solvent is increased. In the 7Li NMR spectra at very low temperature the signals of the SSIP disappear and only those of a monomeric CIP and a triple ion (1 Li 1) consisting of two carbanions and one lithium cation are present. For independent confirmation, the hitherto unknown 6-, 7-, and 3-trimethylstannyl substituted bicyclo[3.2.1]octa-2,6-dienyllithium derivatives 2 a Li, 2 b Li, and 3 Li were synthesized and also studied by 119Sn, 13C, and 1H NMR. According to the temperature dependence of the δ(13C)-values the CIP/SSIP-equilibrium of 2 a Li in THF/TMEDA is shifted to the CIP side. The observation of a unique 119Sn-7Li coupling (6.2 Hz) shows that at –90 °C a species containing 2 a and lithium exists under slow exchange conditions. A similar coupling of 3.5 Hz can be estimated for 3Li. A mixture of the epimeric carbanions 2a and 2 b yields two sets of 13C NMR signals which are due to the diastereomeric triple ions 2 aLi 2 a and 2 aLi 2 b.

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