Author
Vladislav Tomišić
Other affiliations: Centre national de la recherche scientifique
Bio: Vladislav Tomišić is an academic researcher from University of Zagreb. The author has contributed to research in topics: Solvation & Acetonitrile. The author has an hindex of 20, co-authored 71 publications receiving 1274 citations. Previous affiliations of Vladislav Tomišić include Centre national de la recherche scientifique.
Topics: Solvation, Acetonitrile, Protonation, Calixarene, Hydrogen bond
Papers published on a yearly basis
Papers
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TL;DR: Crystal structures of 2a and rac-5a show the presence of organisational motifs and intermolecular interactions in agreement with those in gel fibres elucidated by spectroscopic methods.
Abstract: Bis(LeuOH) (1a), bis-(ValOH) (2a) and bis(PhgOH) (5a) (Phg denotes (R)-phenylglycine) oxalyl amides are efficient low molecular weight organic gelators of various organic solvents and their mixtures as well as water, water/DMSO, and water/DMF mixtures. The organisational motifs in aqueous gels are dominated primarily by lipophilic interactions while those in organic solvents are formed by intermolecular hydrogen bonding. Most of the gels are thermoreversible and stable for many months. However, 2a forms unstable gels with organic solvents which upon ageing transform into variety of crystalline shapes. For some 1a/alcohol gels, a linear correlation between alcohol dielectric constants (epsilon) and gel melting temperatures (Tg) was found. The 1H NMR and FTIR spectroscopic investigations of selected gels reveal the existence of temperature dependent network assembly/dissolution equilibrium. In the 1H NMR spectra of gels only the molecules dissolved in entrapped solvent could be observed. By using an internal standard, the concentration of dissolved gelator molecules could be determined. In FTIR spectra, the bands corresponding to network assembled and dissolved gelator molecules are simultaneously present. This enabled determination of the Kgel values by using both methods. From the plots of InKgel versus 1/T, the deltaHgel values of selected gels have been determined (-deltaHgel in 10-36 kJ mol(-1) range) and found to be strongly solvent dependent. The deltaHgel values determined by 1H NMR and FTIR spectroscopy are in excellent agreement. Crystal structures of 2a and rac-5a show the presence of organisational motifs and intermolecular interactions in agreement with those in gel fibres elucidated by spectroscopic methods.
183 citations
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TL;DR: In this paper, the authors summarized methods for determining proton surface charge at mineral/water inter-faces and proposed a reference titration procedure that would allow direct, unbiased comparisons of experimental data.
Abstract: This article summarizes methods for determining proton surface charge at mineral/water inter- faces. It covers conventional experimental procedures and discusses problems with the techniques. Also it involves recommendations for obtaining reasonable and comparable results. The term "comparable re- sults" refers to comparison between results for the same solid as obtained in different laboratories. The most important parameters for the surface titrations are discussed. We also propose a reference titration procedure that would allow direct, unbiased comparisons of experimental data. The article finally includes a check-list for researchers and reviewers which should allow limiting the amount of titration data that are not useful for future uses. (doi: 10.5562/cca2062)
104 citations
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TL;DR: A statistically good agreement was found between the amounts of paracetamol determined using PLS and GA-PLS algorithms, and that obtained by UHPLC analysis, whereas for tramadol results were proven to be more reliable compared to those of PLS.
81 citations
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TL;DR: The bis(phenanthridinium) receptor molecules 3–5 bind nucleotides in aqueous media by stacking interactions between cis-oriented receptor units and the intercalated nucleic base part of a nucleotide with stability constants in the range 105–106 dm3 mol–1, the highest measured to date for these type of receptors and substrates.
Abstract: The bis(phenanthridinium) receptor molecules 3–5 bind nucleotides in aqueous media by stacking interactions between cis-oriented receptor units and the intercalated nucleic base part of a nucleotide with stability constants in the range 105–106 dm3 mol–1, the highest measured to date for these type of receptors and substrates.
63 citations
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TL;DR: In this paper, the equilibria of the Schiff bases of salicylaldehyde with 2-aminopyridine, 2,3-diaminopyridylmethylimi-nomethyl)phenol, and 3-aminomethodylpyridine were studied by means of spectroscopic methods.
51 citations
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2,820 citations
01 Dec 1991
TL;DR: In this article, self-assembly is defined as the spontaneous association of molecules under equilibrium conditions into stable, structurally well-defined aggregates joined by noncovalent bonds.
Abstract: Molecular self-assembly is the spontaneous association of molecules under equilibrium conditions into stable, structurally well-defined aggregates joined by noncovalent bonds. Molecular self-assembly is ubiquitous in biological systems and underlies the formation of a wide variety of complex biological structures. Understanding self-assembly and the associated noncovalent interactions that connect complementary interacting molecular surfaces in biological aggregates is a central concern in structural biochemistry. Self-assembly is also emerging as a new strategy in chemical synthesis, with the potential of generating nonbiological structures with dimensions of 1 to 10(2) nanometers (with molecular weights of 10(4) to 10(10) daltons). Structures in the upper part of this range of sizes are presently inaccessible through chemical synthesis, and the ability to prepare them would open a route to structures comparable in size (and perhaps complementary in function) to those that can be prepared by microlithography and other techniques of microfabrication.
2,591 citations
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1,828 citations
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1,659 citations
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TL;DR: This review focuses on various potential applications of supramolecular hydrogels as molecular biomaterials, classified by their applications in cell cultures, tissue engineering, cell behavior, imaging, and unique applications of hydrogelators.
Abstract: In this review we intend to provide a relatively comprehensive summary of the work of supramolecular hydrogelators after 2004 and to put emphasis particularly on the applications of supramolecular hydrogels/hydrogelators as molecular biomaterials. After a brief introduction of methods for generating supramolecular hydrogels, we discuss supramolecular hydrogelators on the basis of their categories, such as small organic molecules, coordination complexes, peptides, nucleobases, and saccharides. Following molecular design, we focus on various potential applications of supramolecular hydrogels as molecular biomaterials, classified by their applications in cell cultures, tissue engineering, cell behavior, imaging, and unique applications of hydrogelators. Particularly, we discuss the applications of supramolecular hydrogelators after they form supramolecular assemblies but prior to reaching the critical gelation concentration because this subject is less explored but may hold equally great promise for helping ...
1,395 citations