Complex hydrogen bonded cations

Clements, R.; Wood, John L.; Singh, T. R.; Dean, R. L.

doi:10.1016/0022-2860(73)85170-1

Cited by 56 publications

(12 citation statements)

References 21 publications

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“…1611, and 1634 cm -1 ), which are not observable in 1 and may be attributed with great probability to the vibrations of pyH + cation [18]. These values are all close to those observed for pyHCl [19]. The unidentate coordination of OOC group removes the equivalence of the two oxygen atoms.…”

supporting

confidence: 72%

Synthesis and crystal structure of novel mononuclear Mo(IV) and Mo(III) complexes containing bis(3,5-dimethylpyrazol-1-yl)acetate anion as ligand

Kitanovski

Golobič

Čeh

2011

Inorganic Chemistry Communications

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supporting

confidence: 72%

Synthesis and crystal structure of novel mononuclear Mo(IV) and Mo(III) complexes containing bis(3,5-dimethylpyrazol-1-yl)acetate anion as ligand

Kitanovski

Golobič

Čeh

2011

Inorganic Chemistry Communications

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“…(5) 3,5-dimethylpyridinium picrate; (6) 3,4-dimethylpyridinium picrate; (7) 2,6-dimethylpyridinium picrate; (8) 2,4,6-trimethylpyridinium picrate; (9) 4-aminopyridinium picrate; (10) 4-(dimethylamino)pyridinium picrate. On plotting values of F(z)/A against those of AC/±2/F(z), we obtain linear relations but the intercepts of the F(z)/A axis yield limiting conductances A0 which are abnormally low.…”

Section: Resultsmentioning

confidence: 99%

Specific interactions of pyridinium ions and pyridine molecules in nitrobenzene. Substituent effects

Haulait-Pirson¹,

Pauw²

1980

J. Phys. Chem.

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“…[3] Upon heating between 308 and 310 K, the [H 5 ]PyD + n(CÀH) stretch at 3025 cm À1 [22] and the [H 5 ]Py n(CÀH) stretch at 3083 cm À1 decrease in absorbance, whereas the DPPC acyl chain n as (CH 2 ) stretch at 2920 cm À1 increases. The DPPC n(CÀO) stretch increases in absorbance whereas the [H 5 ]PyD + skeleton n(CÀC) stretch at 1585 cm À1 [21] and the DOD stretch decrease. As discussed below, the transformation of micelles implies mainly a transformation of the DPPC monolayer.…”

Section: Isotope Effects Of the Composition Of Micellesmentioning

confidence: 95%

“…[21] In our case, since the proportion of water and thereby of pyridinium in micelles is small, such complexes are in a very small proportion. Different changes in absorbance of the vibrations of the three components of the 1.1:…”

Section: Isotope Effects Of the Composition Of Micellesmentioning

confidence: 97%

Deuteration of Water Enables Self‐Organization of Phospholipid‐Based Reverse Micelles

et al. 2010

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Phospholipid-based reverse micelles are composed of branched cylinders. Their branching points are known to attract themselves and to slide along branches. The rate of this sliding is governed by the lifetime of H(D)-bonded water bridges between phospholipid molecules. This lifetime is increased when the water is deuterated. On condition that the water contains at least 40 D atoms%, water/dipalmitoylphosphatidylcholine (DPPC)/deuterated pyridine reverse micelles with the composition 1.1:1:250 (v/v) have been shown to self-organize into a liquid crystal in the 310-316 K temperature range. The mechanism of this self-organization is unraveled by following the FTIR and (1)H NMR spectra of more concentrated micelles upon heating. During the preparation of micelles, pyridine-(D(+))H(+) ions are formed. They give rise to hydron transfers, under the influence of the DPPC electric charges, evidenced by two broad FTIR absorptions above (BB1) and below (BB2) the nu(C-O) stretch. These hydron transfers occur along strong (D(+))H(+) bonds of pyridinium ions with pyridine (BB1) and DPPC C=O groups (BB2). The proton transfers at the interface of micelles, relayed in the continuous pyridine medium, create a tenuous link between separated micelles, thus facilitating their organization. Upon heating, DPPC heads shrink and DPPC chains expand to make wedge-shaped DPPC molecules. The micelles then change in shape: cylinders constrict and enclosed water drifts towards branching points, which swell. Branching points of neighboring micelles come into contact. Due to the deuteration of water these contacts are prolonged and H bonds are formed between DPPC molecules located in each branching point. Upon storage at 39 degrees C, these branching points fuse. The lateral diffusion of DPPC molecules becomes free, as evidenced by a narrowing of all (1)H NMR resonances. Upon further heating, reorganization into a liquid crystal occurs.

show abstract

Complex hydrogen bonded cations

Cited by 56 publications

References 21 publications

Synthesis and crystal structure of novel mononuclear Mo(IV) and Mo(III) complexes containing bis(3,5-dimethylpyrazol-1-yl)acetate anion as ligand

Synthesis and crystal structure of novel mononuclear Mo(IV) and Mo(III) complexes containing bis(3,5-dimethylpyrazol-1-yl)acetate anion as ligand

Specific interactions of pyridinium ions and pyridine molecules in nitrobenzene. Substituent effects

Deuteration of Water Enables Self‐Organization of Phospholipid‐Based Reverse Micelles

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