Lactic acid in solution: Investigations of lactic acid self-aggregation and hydrogen bonding interactions with water and methanol using vibrational absorption and vibrational circular dichroism spectroscopies

2008 ◽  
Vol 128 (1) ◽  
pp. 014508 ◽  
Author(s):  
Martin Losada ◽  
Ha Tran ◽  
Yunjie Xu
Keyword(s):  
Hydrogen Bonding ◽  
Lactic Acid ◽  
Circular Dichroism ◽  
Vibrational Circular Dichroism ◽  
Vibrational Absorption ◽  
Hydrogen Bonding Interactions ◽  
Circular Dichroïsm ◽  
Self Aggregation

Aggregation of lactic acid in cold rare-gas matrices and the link to solution: a matrix isolation-vibrational circular dichroism study

2019 ◽  
Vol 21 (7) ◽  
pp. 3574-3584 ◽  
Author(s):  
Angelo Shehan Perera ◽  
Joseph Cheramy ◽  
Mohammad Reza Poopari ◽  
Yunjie Xu
Keyword(s):  
Lactic Acid ◽  
Circular Dichroism ◽  
Matrix Isolation ◽  
Vibrational Circular Dichroism ◽  
Rare Gas ◽  
Spectral Features ◽  
Circular Dichroïsm ◽  
Self Aggregation ◽  
Insight Into

Crucial insight into lactic acid self-aggregation in solution is obtained by following its unique VCD spectral features in cold matrices.

The important role of non-covalent interactions for the vibrational circular dichroism of lactic acid in aqueous solution

2021 ◽  
Author(s):  
Sascha Jähnigen ◽  
Daniel Sebastiani ◽  
Rodolphe Vuilleumier
Keyword(s):  
Lactic Acid ◽  
Circular Dichroism ◽  
Computational Study ◽  
Bulk Water ◽  
Vibrational Circular Dichroism ◽  
Ab Initio Molecular Dynamics ◽  
Non Covalent Interactions ◽  
Circular Dichroïsm ◽  
Covalent Interactions

We present a computational study of vibrational circular dichroism (VCD) in solutions of (S)-lactic acid, relying on ab initio molecular dynamics (AIMD) and full solvation with bulk water. We discuss...

Lateral, Chiral Tin(IV) Porphyrin Assemblies

1998 ◽  
Vol 02 (03) ◽  
pp. 273-284 ◽  
Author(s):  
BIANCA ROSENGARTEN ◽  
CHRISTOPH BÖTTCHER ◽  
ANDREA SCHULZ ◽  
J.-H. FUHRHOP ◽  
ULRICH SIGGEL
Keyword(s):  
Hydrogen Bonding ◽  
Lactic Acid ◽  
Circular Dichroism ◽  
Hydrochloric Acid ◽  
Protoporphyrin Ix ◽  
Mirror Image ◽  
Chloride Ions ◽  
Hydrogen Atoms ◽  
Circular Dichroism Spectra ◽  
Circular Dichroïsm

The μ-Oxo stacks of tin(IV) porphyrins rearrange to staircase-type and lateral aggregates upon replacement of the oxygen ligands by chloride ions. The lateral aggregation of tin(IV) 2,18-dipropionate porphyrins in hydrochloric acid at pH 0–0.5 is favoured by 8,13-ethyl groups instead of the natural 8,13-vinyl groups of protoporphyrin IX and is impeded by hydrogen atoms at these positions. Replacement of axial chloride counterions to the tin(IV) central ions by cyanate counterions at pH 4.5 leads to similar aggregates if the cyanate ions are connected by hydrogen bonding to acetic or lactic acid. In this case, aggregation is not necessarily impeded by hydrogen atoms at positions 8 and 13. D- and L-lactic acid enforce chiral assemblies of the tin(IV) deuteroporphyrin 1a with mirror image CD (circular dichroism) spectra (θ ≈ 8 × 105 deg cm 2 dmol −1), whereas the gluconoyl hydrazide-substituted tin(IV) deuteroporphyrin 1d does not form aggregates at all.

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