Professor of Physical Chemistry at the Indian Institute of Science. Teaching and research, primary and higher education. Science.
Joined September 2012
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Exactly five weeks after my elder brother passed away, a younger sister of me, Meenakshi Bharathi, passed away. Some memories and tribute to her. She was indeed a hero who became a matriarch at a very young age. earunan.org/2026/11/07/my-si…
My elder brother Thambidhurai passed away on Saturday 26 September 2026, the full moon day in Purattasi, Tamil month. I recollect what I remember of him and our ancestors in this blog for anyone interested. earunan.org/2026/10/28/aalad…
I am indeed happy to complete my formal service at the Indian Institute of Science effective 31 July 2026. I could not have found a better place to live and work. I do plan to continue as an honorary professor. I need to spend some time for other important things in life.
I used to write Letters to the Hindu during 2005-15, some of which were published and more which were not. In 2015, I started blogging . I noted that the online links to some of the letters do not work anymore. earunan.org/2026/06/02/lette…
I am pleased to share this article on hydrogen bond potential for HCN/HNC complexes. To the best of my knowledge, this is the first time a hydrogen bond potential has been proposed. link.springer.com/article/10…
This paper is from our Computational and Data Sciences and uses molecular dynamics simulation. As we showed in our recent papers on hydrogen bonds, this paper also shows that one should not use distance between the two atoms to conclude that it is bonded. pubs.acs.org/doi/10.1021/acs…
Elangannan Arunan retweeted
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/ar…
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.70313
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=k3jErtyF…
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-y…
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/birth…
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/gandh…
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/scien…
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.awstrac…
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-r…
2024 PCCP (Physical Chemistry Chemical Physics) outstanding peer reviewers. Pleased to be in this list. rsc.org/journals-books-datab… via @RoySocChem