Influence of the cis/trans configuration on the supramolecular aggregation of aryltriazoles

• Sara Tejera,
• Giada Caniglia,
• Rosa L. Dorta,
• Andrea Favero,
• Javier González-Platas and
• Jesús T. Vázquez

Beilstein J. Org. Chem. 2019, 15, 2881–2888, doi:10.3762/bjoc.15.282

• (in % w/w). Critical gelation concentration (CGC, in % w/w) and gel–sol transition temperature (Tgs, via dropping-ball method) for compounds 7f, 8a, 8b, 8e, 8f, 10, 12, and 14. Supporting Information Supporting Information File 616: An SEM image collection of the xerogels and X-ray data for compound

A new class of organogelators based on triphenylmethyl derivatives of primary alcohols: hydrophobic interactions alone can mediate gelation

• Wangkhem P. Singh and
• Rajkumar S. Singh

Beilstein J. Org. Chem. 2017, 13, 138–149, doi:10.3762/bjoc.13.17

• the derivatives was moderate to excellent with a minimum gelation concentration ranging between 0.5–4.0% w/v and a gel–sol transition temperature range of 31–75 °C. 1,8-Bis(trityloxy)octane, the ditrityl derivative of 1,8-octanediol was the most efficient organogelator. Detailed characterizations of

• 0.5% in both propan-1-ol and DMSO. MGC values for TPM-G5 and TPM-G4 are 2.0% (DMSO) and 4.0% (diethyleneglycol), respectively. Figure 2 shows the gel–sol transition temperature (Tgel) of the gels which were determined using the dropping ball method [31]. Tgel values (at MGC) for TPM-G12 are 73 °C

• acidic solution in contrast to its unstable solution-phase behavior. Differential scanning calorimetry Differential scanning calorimetry (DSC) of gels prepared from TPM-G12 (in propan-1-ol and DMSO) was carried out to study the gel-sol transition (Tgel) behaviour. Figure 3 shows the DSC heating curves of

Synthesis of photoresponsive cholesterol-based azobenzene organogels: dependence on different spacer lengths

• Yuchun Ren,
• Bin Wang and
• Xiuqing Zhang

Beilstein J. Org. Chem. 2015, 11, 1089–1095, doi:10.3762/bjoc.11.122

• gel–sol transition occurred by breaking and reforming of van der Waals interactions. The cholesterol-substituted diacetylenic polymerized gels exhibit enhanced stability upon thermo- or photo-stimuli [27]. Although similar compounds have been discussed, it is still not very clear about the

Self-assembly of 2,3-dihydroxycholestane steroids into supramolecular organogels as a soft template for the in-situ generation of silicate nanomaterials

• Valeria C. Edelsztein,
• Andrea S. Mac Cormack,
• Matías Ciarlantini and
• Pablo H. Di Chenna

Beilstein J. Org. Chem. 2013, 9, 1826–1836, doi:10.3762/bjoc.9.213

• at 5 °C. The critical concentration for gelation (CCG) was determined by subsequent dilution of the original organogel followed by a heating–cooling process until gel formation was not observed at room temperature (20 °C) The reversible gel–sol transition temperatures (Tg) were measured using the

A peptidic hydrogel that may behave as a “Trojan Horse”

• Nicola Castellucci,
• Giorgio Sartor,
• Natalia Calonghi,
• Carola Parolin,
• Giuseppe Falini and
• Claudia Tomasini

Beilstein J. Org. Chem. 2013, 9, 417–424, doi:10.3762/bjoc.9.44

• been reported [11]. In the gels, noncovalent, weak interactions between the individual LMWHG molecules hold the fibers together. The gel-forming characteristics of LMWHGs can be controlled by altering the strength of these interactions, as illustrated by the thermal reversibility of the gel–sol

• transition. They have a wide range of applications in biomaterials, biosensors, tissue engineering, and drug delivery [12][13][14][15]. The interest in these materials as tools for the controlled release of drugs is mainly linked to their capability to release gel-entrapped molecules in response to external

Expanding the gelation properties of valine-based 3,5-diaminobenzoate organogelators with N-alkylurea functionalities

• Hak-Fun Chow and
• Chin-Ho Cheng

Beilstein J. Org. Chem. 2010, 6, 1015–1021, doi:10.3762/bjoc.6.114

• , 12, 15, 18 and 20) on their gelation power was then compared by the determination of their minimum gelation concentration (MGC) and gel-sol transition temperature (Tg) in different solvents (Table 2). It was found that the longer the alkyl chain, the lower the MGC but the higher the Tg value. Hence

Insights into the mechanical properties of a silicone oil gel with a ‘latent’ gelator, 1-octadecylamine, and CO₂ as an ‘activator’

• Emiliano Carretti,
• Mathew George and
• Richard G. Weiss

Beilstein J. Org. Chem. 2010, 6, 984–991, doi:10.3762/bjoc.6.111

• ; gel-sol transition; rheology; viscosity; Introduction During the last two decades, research efforts have increased enormously to understand the range of structures and processes of self-assembly of ‘small’ molecules such as low-molecular-mass organogelators (LMOGs), which gelate large volume

Towards racemizable chiral organogelators

• Jian Bin Lin,
• Debarshi Dasgupta,
• Seda Cantekin and
• Albertus P. H. J. Schenning

Beilstein J. Org. Chem. 2010, 6, 960–965, doi:10.3762/bjoc.6.107

• macroscopic behavior. Most of the earliest stimuli-responsive gels undergo a UV-induced transformation, which can be reversed by visible light. For example, Shinkai and coworkers demonstrated that trans-cis isomerization of gelator compounds by UV/visible light could induce a gel-sol transition [6]. Feringa

Chiral gels derived from secondary ammonium salts of (1R,3S)-(+)-camphoric acid

• Tapas Kumar Adalder,
• N. N. Adarsh,
• Ravish Sankolli and
• Parthasarathi Dastidar

Beilstein J. Org. Chem. 2010, 6, 848–858, doi:10.3762/bjoc.6.100

• equation (Equation 1) resulted in a linear semilog plot (Figure 3), when the mole fraction of the gelator at each concentration was plotted against 1/Tgel K−1. Where ΔHm and Tgel are the enthalpy change and temperature associated with the gel-sol transition process, respectively and R is universal gas

• constant. Here it is considered that gel-sol transition is first order in nature on the assumption that the gel melts into an ideal solution wherein the exact amount of gel involved in the transition is known. The calculated ΔH value for DBAMC 6 is 60.9 kJ/mol and that of DBUAMC 3 is 56.5 kJ/mol