Calorimetric Determination of the Equilibrium Constant and the Heat of Formation of Hydrogen Bonded Complexes

Basicity. Comparison of hydrogen bonding and proton transfer to some Lewis bases

“…This can be a particularly difficult problem when AHt and K¡ are to be obtained from the same set of thermometric titration data. [36][37][38][39][40] In the present study [AH] and [B] were generally varied between (2 and 15) X 10-3 M. In no case did either concentration exceed 0.025 M. Detailed tabulations and calculations for determination of AHt of compounds listed in Table II by the high dilution method are given in E. J. M.'s thesis (obtainable through University microfilms).…”

“…AH¡ measurements are readily obtained for the protonation of most bases in this single medium in which the protonation process is complete and well defined, as is shown by freezing point depressions, electrical conductivities, nmr observations, and ultraviolet spectroscopy.27•28 •81 Several years ago we noted that a surprisingly good linear correlation is found between AH, and pK& for many compounds including a variety of weak bases whose pAVs have been determined by acidity function methods. In view of the errors in many previous p^fB estimates17 and the availability of a number of new nitrobenzene, (3) 2,4,6-trinitroaniline, (4) acetonitrile, (5) 2-bromo-4,6-dinitroaniline, (6) 2,6-dinitroaniline, (7) diethyl sulfide, (8) 2,4-dinitroaniline, (9) diethyl ether, (10) 2,6-dichloro-4-nitroaniline, (11) 1,4-dioxane, (12) diphenylcyclopropenone, (13) triphenylphosphine oxide, (14) tetrahydrofuran, (15) 2,5-dichloro-4-nitroaniline, (16) Ar,,V-dimethylbenzamide, (17) 4-chloro-2-nitroaniline, (18) 2-nitroaniline, (19) A/.V-dimethylacetamide, (20) A7-methylformamide, (21) AyV-dimethylformamide, (22) dimethyl sulfoxide, (23) 2-chloropyridine, (24) pyridine Ar-oxide, (25) 2-bromopyridine, (26) 2,4,6-tribromoaniline, (27) 4-nitroaniline, (28) 2,4-dichloroaniline, (29) 3-nitroaniline, (30) 2-iodoaniline, (31) 2-chloroaniline, (32) triphenylphosphine, (33) 3-bromopyridine, (34) 2-fluoroaniline, (35) 3-chloroaniline, (36) 4-iodoaniline, (37) 4-bromoaniline, (38) 4-chloroaniline, (39) 2-methylaniline, (40) aniline, (41) 4-fluoroaniline, (42) quinoline, (43) V,A'-dimethylaniline, (44) 4-methylaniline, (45) pyridine, (46) 4-methylpyridine, (47) 2,6-dimethylpyridine, (48) 2,4,6-trimethylpyridine, (49) tri-zi-butylamine, (50) triethylamine, (51) quinolidine, (52) diethylamine, (53) di-zz-butylamine, (54) phenyl methyl sulfoxide, (55) 2,6-dimethyl-7-pyrone, (56) A'-methyl-2-pyrrolidone.…”

Hydrogen-bonded complex formation. III. Thermodynamics of complexing by infrared spectroscopy and calorimetry

“…(5) 2-butanone; (6) N,N-dimethylaminopropionitrile; (7) enthrone; (8) tetrahydrofuran; (9) 3-bromopyridine; (10) cyclohexanone; (11) quinoline; (12) pyridine; (13) triethylamine; (14) N-methylformamide; (15) diphenyl sulfoxide; (16) 4-picoline, (17) , -dimethylformamide; (18) , -dimethylacetamide; (19) dimethyl sulfoxide; (20) triphenylphosphine oxide; (21) hexamethylphosphoramide; (22) cyclopropylamine; (23) 4-dimethylaminopyridine. Compounds 1,2, and 6 have two acceptor sites as shown by infrared.…”

Symmetry Breaking during the Formation of β-Cyclodextrin−Imidazole Inclusion Compounds: Capillary Electrophoresis Study

“…Third, there must be sufficient concentrations of both free ligand and ligand-solute complex present. [8][9][10][11] It is usually assumed in general studies that the stoichiometry of the complex is 1:1. [12][13][14][15] Several inconsistencies in the assignment of binding stoichiometries appear in the literature.…”