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Hydrogen Bonding of Anilines: Experimental and Theoretical Studies of Complexes of Various Compositions

Borisenko V. E.

Polish Journal of Chemistry

2009

Vol. 83, nr 5

1025-1059

Review of works on studies of the influence of the position, numberand a kind of substituents in phenylring of aniline on proton do or ability in hydrogen bond, spectral, geometric, electrooptic and force characteristics of amino group in complexes with different proton acceptors of 1:1 and 1:2 composition in intra- and intermolecular hydrogen bonds is presented. The influence of proton donors and proton acceptors on the kind of correlation between spectral, geometric, force and electrooptic characteristics of the amino group is analyzed. Obtained results demonstrate the possibility of quantitative description of the changes of dynamic, geometric, force and electrooptic properties of amino group in substituted anilines on passing from free molecules to bonded ones and extend the under standing of the role of various factors in the process of molecular agreegation.

Stability of Mn(II) Complexes with Acetic Acid Derivatives

Pedras M., John E.

Polish Journal of Chemistry

2007

Vol. 81, nr 10

1701-1706

Composition and stability constants of Mn(II) complexes with acetic, glycolic (hydroxyacetic), methoxyacetic and phenylacetic acids, glycine (aminoacetic acid), and sarcosine (N-methylglycine) were determined, at a constant ionic strength = 0.1 KNO3 using the potentiometric method at 20 graduate C. Values of stability constants were found by Bjerrum graphical method and also numerically using Martell and Motekaitis program. The following logK1,graph. values of Mn(II) complexes were found: 2.21 for the complex with acetic acid, 2.45with glycolic acid, 2.10 with methoxyacetic acid, 2.48 with phenylacetic acid, 3.10 with glycine and 3.05 with sarcosine.

Uptake of molecular oxygen by Co(II) chelates with peptides in aqueous solution. Part X. Diastereoisomeric dipeptides as auxiliary ligands in oxygen-free complexes

Kufelnicki A., Świątek M.

Polish Journal of Chemistry

1998

Vol. 72, nr 8

1897-1906

Co(II) complexes with group of diastereoisomeric dipeptides consisting of alanine and leucine in various chiral forms have been studied in aqueous solution. The equilibria were determined by potentiometric and spectrophometric methods, using least-squares fotting procedures. The results were compared with those for glycine dipeptides containing only one asymmetric atom.