Elangannan Arunan

Are atoms really spheres? #IISc researchers say no! Their study reveals that hydrogen atoms in bonds are actually elliptical. This new understanding of long & short radii helps scientists predict molecular structures with far greater precision #SARAL #ANRF #Shivkumarkalyanaraman

I am pleased to share this review on hydrogen bond radii for donors and acceptors. We were bold (stupid?) enough to define hydrogen bond radii. van der Waals radii may not be used for confirming / ruling out hydrogen bonds. sciencedirect.com/science/articl…

All atoms are considered spherical though it was recognized that none are. We discuss the long and short radii for hydrogen atom. dx.doi.org/10.1002/jcc.70…

On the remembrance day of Periyar and MGR. earunan.org/2025/12/24/aga…

Sashi Tharoor's comments about the meeting between Mamdani and Trump reminded me of this slide I use in explaining chemical bonds using interactions between humans. Worth thinking about it. I hole the ruling party responsible for ensuring it.

Second episode of the discussion with Prof. N. Sukumar on chemical bonding. Dr. Mausumi Goswami in front of the microwave spectrometer. youtube.com/watch?v=k3jErt…

Today happens to be the birthday of two Nobel Laureates, Marie Curie and C. V. Raman. In 1994, on this day, I decided to start my academic career in India and joined IIT Kanpur as an Assistant Professor in Chemistry. earunan.org/2015/11/07/yes…

Had a chat with Prof. N. Sukumar on Chemical bonding and in particular hydrogen bonding. It will be on you tube in 3 parts. First part here: The hydrogen bond - do we need to rethink our definition of a chemical bond? - YouTube

Today happens to be the birth anniversary of Prof. M. Ilanchezian who worked tirelessly for social reform in Tamil Nadu in the first half of 20th century. He worked in Pachaiyappa College as Faculty, Chair and Principal. earunan.org/2025/10/21/bir…

I have been thinking about Gandhi, King and Mandela. I have started reading the Skin in the game. These men had soul in the game. earunan.org/2025/10/02/gan…

It was very disappointing to read the letter by some scientists in India to PMO accusing the fellow scientists of politcal activism. I wrote my views in this blog. earunan.org/2025/09/02/sci…

1,3,5-trimethylcyclohexane, a surrogate for RP-3 fuel. A comprehensive experimental, computational and kinetic modeling of its pyrolysis. kwnsfk27.r.eu-west-1.awstrack.me/L0/https:%2F%2…

I thought of publishing this in Current Science. Apparently, they do not publish anything other than Science. Indian Academy of Sciences has two other online Journals to cater to such articles. This one has just appeared in Confluence. confluence.ias.ac.in/trust-respect-…

2024 PCCP (Physical Chemistry Chemical Physics) outstanding peer reviewers. Pleased to be in this list. rsc.org/journals-books… via @RoySocChem

Recent deportation of Indians from US and some Indian parents opting for pre-mature deliver are very disturbing indeed. earunan.org/2025/02/08/eve…

@csit_iisertvm organized a Spectra 2025 conference dedicated to "Quantum Science & Applications" on 11 Jan 2025; experts talks by Prof. E Arunan, IISc Bangalore, Prof. Balanaraya, IISER Mohali, Prof. Anindya Datta, IIT Bombay, Prof. R. Swathi for the expert's insights.

Ten years ago today, Chemical and Engineering News featured carbon bond, discovered in 2013 by us confirmed within a few months by Prof. Guru Row. cen.acs.org/articles/92/i1…

I started writing a blog on family in May 2024 and finally finished it. I am convinced that as long as family structure survives humanity will survive. Let me wish everyone a very happy, healthy, peaceful, and prosperous 2025. earunan.org/2024/12/31/fam…

I am pleased to share this paper. IUPAC Recommendations: (Un)equivocal Understanding of Hydrogen and Halogen Bonds and Their (Un)equivocal Naming! | Crystal Growth & Design (acs.org)

A blog about my parents. My mother passed away in 2014 and my father passed away last week. I have been fortunate to have them in my life. earunan.org/2024/01/23/my-…