Functional organogelators

His research interests deal with the chemistry of cyclopropane derivatives, 1,3-dipolar cycloadditions, synthesis of natural compounds and biologically active analogues. Recently, the research activity is also dedicated to synthetic studies for the production of new materials light-harvesting antenna systems and functionalized organogelators. 

Zhang, L. et ah. Pyrene-functionalized organogel and spacer effect From emissive nanofiber to nanotube and inversion of supramolecular chirality. Soft Matter, 2013. 9(33) 7966—7973. 

Other examples of functional organogel systems include for instance mesogenic derivatives of cyclohexyl bis-amide 23 which form novel liquid crystaline materials with nematic liquids [66], and the tetraoctadecylammonium bromide (like 3) and the metal-containing gluconamides 12 which were able to gelate monomers as styrene and methacrylates and were used to prepare nanoporOus membranes and for polymer imprinting [67,20]. 

Li, X.Q., Stepanenko, V, Chen, Z., Prins, P., Siebbeles, L.D.A., Wurthner, E Functional organogels from highly efficient organogelator based on perylene bisimide semiconductor. Chem. Commun. 2006, 3871-3873 (2006)... 

Ajayagosh, A. and Praveen, V.K. (2007) rt-Organogels of self-assembled p-phenylenevinylenes soft materials with distinct size, shape, and functions. Accounts of Chemical Research, 2007,40 (8), 644-656. 

In a similar way, other derivatives of diamines (S,S)-28 and (R,R)-29 were evaluated for their gelation properties. As an example, trans-(R,R) 1,2-bis(dodecy-lureido)cyclohexane and trans-(R,R)-1,2-bis(octadecylureido)cyclohexane can cause physical gelation in a wide variety of organic solvents [76]. As an extension of these studies, novel polymerizable organogelators based on tra s-(7 ,7 )-l,2-bis(ur-eido)cyclohexane derivatives have been reported [77]. In these molecules, the presence of methacrylate-functionalized carboxylic acid groups determines the... 

Ajayaghosh, A., Praveen, V.K., tt Organogels of Self assembled p Phenylenevinylenes Soft Materials with Distinct Size, Shape, and Functions, Acc. Chem. Res. 2007, 40, 644 656. 

Bile acid derivatives as organogelators were first reported by Hanabusa [94]. However, recently, Maitra has reported bile acid derivatives functionalized at C3 with aromatic groups that gel organic solvents in the presence of trinitrofluorenone 67. The intensity in the color of the gels formed by 68 and 69 increases substantially during gelation in the presence of 67 due to donor-acceptor interactions between the aromatic rings (see Fig. 33) [95]. 

Many of the hydrogen-bonding motifs that have been used in the field of self-assembly have been employed to design new organogelators. The interactions that in earlier studies were directed towards the formation of small, well-defined aggregates can by careful design be diverted for the formation of extensive networks within a gel matrix. In some cases interesting function-... 

The exceptional physical, functional, and nutritional properties of organogels have attracted the attention of the food and pharmaceutical industries. Organogels are used for delivery of drugs, foods, nutraceutical and many other pharmaceutical ingredients through various routes such as oral, parenteral, transdermal, topical, etc. 

Jang K, Ranasinghe AD, Heske C, Lee DC. Organogels from functionalized T-shaped pi-conjugated bisphenazines. Langmuir. 26(16) (2010) 13630-13636. 

Baddeley C, Yan Z, King G, Woodward PM, Badjic JD. Structure-function studies of modular aromatics that form molecular organogels. J Org Chem. 72(19) (2007) 7270-7278. 

Zou, J. et ah. Responsive organogels formed by supramolecular self assembly of PEG-block-allyl-functionalized racemic polypeptides into P-sheet-driven polymeric ribbons. Soft Matter, 2013.9 5951—5958. 

Lupi, F.R. et al., Olive oil/policosanol organogels for nutraceutical and drug delivery purposes. Food and Function, 2013.4(10) 1512-1520. 

Van Esch. J.H. Feringa, B.L. New functional materials based on self-assembling organogels, from serendipity towards design. Angew. Chem.. Int. Ed. 2000. 39. 2263-2266. 

H.P.M. Rowan. A.E. Feiters, M.C. Nolle. R.J.M. Organogel formation and molecular imprinting by functionalized gluconamides and their metal complexes. Chem. Comniun. 1997. 545-546. 

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