Related Experiment Video
Updated: May 28, 2025

In Situ High Pressure Hydrogen Tribological Testing of Common Polymer Materials Used in the Hydrogen Delivery Infrastructure
Published on: March 31, 2018
Hydrogen Sulfide Induced Unique Twisted-Rod Assemblies from Norbornene-Based Polymer in Aqueous Environment as
Moumita Gupta1, Narayan Das1, Srujana Mohanty1
1Polymer Research Center, Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER), Kolkata, West Bengal, 741246, India.
Abstract:
Hydrogen sulfide, being a poisonous pollutant, (H2S) is known for its pungent smell. Although it is having significant role in the biological and physiological processes as a potential biomarker in the present day. The over-expression of H2S leads to several biological disorders and diseases, therefore, monitoring the level of H2S in the biological pH is important. Optical sensors to detect hydrogen sulfide have gained popularity due to their cost-effectiveness, portability, fast response, etc. Here, we are designing a norbornene-based polymeric bio-sensor for detecting hydrogen sulfide in physiological pH. Hydrophilic and hydrophobic monomers are strategically crafted to permeate polymeric sensors with water solubility and the ability to detect hydrogen sulfide, respectively. These monomers are polymerized by ring-opening metathesis polymerization (ROMP). The probe is characterized by nuclear magnetic resonance (NMR) spectroscopy, fluorescence, and UV-visible absorbance spectra. The polymeric sensor can selectively detect hydrogen sulfide with high sensitivity by turn-on fluorescence responses. Moreover, this probe efficiently conducts the morphological changes associated with sensing phenomena. The collapsed vesicles are nicely converted into twisted rods. One dimentional structures (such as twisted rods, etc.) are becoming very interesting as they have fascinating structural and functional properties. Having application in biomedical fields such as targeted drug delivery, imaging, and scaffolds for tissue engineering, it also can exhibits improved mechanical strength, flexibility, unique optical properties, increased surface area, etc. This probe is biocompatible and has the scopes for bio-imaging. Therefore, this water-soluble polymeric probe can open new bio-medical applications for detecting analytes.
More Related Videos
Related Concept Videos
Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation...
Preparation and Reactions of Sulfides
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
Radical Substitution: Allylic Bromination
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Reduction of Alkenes: Catalytic Hydrogenation
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...

