45. “Infrared spectroscopy of isomers of C3H4+ in superfluid helium droplets" Amandeep Singh, Alexandra J. Feinberg, Cheol Joo Moon, Swetha Erukala, Piyush Kumar, Myong Yong Choi, Sugumar Venkataramani, Andrey F. Vilesov* J. Chem. Phys. , 2024, 160, 214306, Accepted article. DOI (A collaborative work with Prof Andrey F. Vilesov and Mr Amandeep Singh, a former master's student from our group, USC, USA)
Radical (Ion) chemistry
44. “Arylazo-3,5-diphenylpyrazole Derivatives: Molecular Probes Exhibiting Reversible Light-induced Phase Transitions for Energy Storage and Direct Photolithographic Patterning" Himanshu Kumar, Gayathri Parthiban, Archana Velloth, Jyoti Saini, Ritobrata De, Santanu Kumar Pal,* Kiran Shankar Hazra,* and Sugumar Venkataramani* Chem. Eur. J., 2024, Accepted article. DOI (Thanks to Prof. Santanu Kumar Pal, IISER Mohali and Dr Kiran Shankar Hazra, INST Mohali, for a wonderful collaboration)
Photoswitching and photoswitchable functional molecules
43. “Azopyridinium Ionic Photoswitches: Tuning Half-lives of Z Isomers from Seconds to Days in Water" Ankit Kumar Gaur, Debapriya Gupta, Dhanyaj Narayanan Nampoothiry, Archana Velloth, Ramanpreet Kaur, Navneet Kaur, and Sugumar Venkataramani* Chem. Eur. J., 2024, Accepted article. DOI
Photoswitching and photoswitchable functional molecules
42. “Photo-Induced Generation of Oxygenated Quaternary Centers via EnT Enabled Singlet O2 Addition to C3-Maleimidated Quinoxaline: A Reagent-Less Approach" Subhendu Ghosh, Tamanna Khandelia, Anjali Mahadevan, Pritishree Panigrahi, Piyush Kumar, Raju Mandal, Deepjyoti Boruah, Sugumar Venkataramani,* and Bhisma K. Patel* Chem. Eur. J., 2024, Accepted article. DOI (A collaborative work with Prof. Bhisma K. Patel, IIT Guwahati)
Radical chemistry
41. “Unravelling the factors affecting the stability and reactivity of dehydro- pyrazole, isothiazole and isoxazole radical isomers: A computational study" Anjali Mahadevan, Piyush Kumar, Shabana Butt, Archana Velloth and Sugumar Venkataramani* New J. Chem., 2024, 48, 10239-10252. DOI
Radical chemistry
40. “ Photocontrol of catalysis in CuAAC reactions by air stable Cu(I) complexes of phenylazopyrazole-incorporated ligands" Debapriya Gupta, Ankit Kumar Gaur, Deepanshu Chauhan, Sandeep Kumar Thakur, Ashish Ashish, Sanjay Singh,* Gopalan Rajaraman,* and Sugumar Venkataramani* Inorg. Chem. Front., 2024, 11, 3555 - 3565. DOI
Photoswitching and photoswitchable functional molecules
39. “Structure–property relationship in functionalized azobenzene photoswitches and their supramolecular behavior" Surbhi Grewal, Anjali Srivastava, Sapna Singh, Sugumar Venkataramani* Photochem. PhotoBiol., 2024, Early view. DOI
This invited article is part of a Special Issue dedicated to "Photosciences in India".
Also, please see the "Highlights" by Prof. Subhajit Badhyopadhyay (IISER Kolkata) in the article "Tuning properties of functionalized azobenzene photoswitches through variation of substitution and their position" about this work. DOI
Photoswitching and photoswitchable functional molecules
38. “Photoswitchable Azoheteroarene-Based Chelating Ligands: Light Modulation of Properties, Aqueous Solubility and Catalysis" Debapriya Gupta, Ankit Kumar Gaur, Ramanpreet Kaur, Ashish, Navneet Kaur, Sugumar Venkataramani* Chem. Eur. J., 2023, 29, 60, e202301906. DOI
Photoswitching and photoswitchable functional molecules
37. “Photochemistry of 2-Iodobenzothiazole and Iodine-Triggered 2-Isocyanophenylthiyl Radical Cyclization in Argon Matrices" Anjali Mahadevan, Piyush Kumar, Sapna Singh, and Sugumar Venkataramani* J. Org. Chem.., 2023, 88, 15, 10574–10585. DOI
Radical Chemistry
36. “Light Switchable Metal Complexes: Introducing Photoresponsive Behaviour Through Azoheteroarenes" Debapriya Gupta,# Ankit Kumar Gaur,# Himanshu Kumar,# Sapna Singh,# Sugumar Venkataramani* ChemPhotoChem., 2023, 7, 9, e202300068. DOI (# Equally contributed)
Invited review
Frontispiece Cover Art Credits: Sapna Singh
Photoswitching and photoswitchable functional molecules
35. “Photoswitchable Rhodamine-Based Multi-analyte Sensors for Metal Ions Detection" Anjali Srivastava, Surbhi Grewal, Sapna Singh, Rajani, Sugumar Venkataramani* ChemPhotoChem., 2023, 7, 9, e202300029. DOI
Photoswitching and photoswitchable functional molecules
34. “Bistable Aryl Azopyrazolium Ionic Photoswitches in Water" Ankit Kumar Gaur, Debapriya Gupta, Anjali Mahadevan, Pravesh Kumar, Himanshu Kumar, Dhanyaj Narayanan Nampoothiry, Navneet Kaur, Sandeep Kumar Thakur, Sanjay Singh*, Tomáš Slanina*, and Sugumar Venkataramani* J. Am. Chem. Soc., 2023, 145, 19, 10584–10594. DOI
Photoswitching and photoswitchable functional molecules
33. “Photoswitchable Cu(II) and Cu(I) Complexes of Phenylazo-3,5-dimethylpyrazole Incorporated Ligands" Debapriya Gupta,‡ Ankit Kumar Gaur,‡ Sandeep Kumar Thakur,‡ Sanjay Singh* and Sugumar Venkataramani* ChemPhotoChem., 2023, 7, 6, e202200338. DOI
Photoswitching and photoswitchable functional molecules
32. “Pd(ii)-catalyzed coupling of C–H bonds of carboxamides with iodoazobenzenes toward modified azobenzenes" Sonam Suwasia,† Sugumar Venkataramani* and Srinivasarao Arulananda Babu* Org. Biomol. Chem., 2023, 21, 1793-1813. DOI (A collaborative work with Prof. S. A. Babu, IISER Mohali)
Photoswitching and photoswitchable functional molecules
30. “Light modulated reversible “On-Off” transformation of arylazoheteroarene based discotics in nematic organization” Pravesh Kumar#, Indu Bala#, Ritobrata De, Santanu Kumar Pal*, Sugumar Venkataramani* Chem. Eur. J., 2023, 29, e202202876. DOI (#Equally contributed)
Photoswitching and photoswitchable functional molecules
31. “Azobenzene-based unnatural amino acid scaffolds via Pd(II)-catalyzed C(sp3)-H arylation strategy" Radha Tomar,† Sonam Suwasia,† Angshuman Roy Choudhury, Sugumar Venkataramani* and Srinivasarao Arulananda Babu* Chem. Commun., 2022, 58, 12967-12970. DOI (†Equally contributed) (A collaborative work with Prof. S. A. Babu, IISER Mohali)
Photoswitching and photoswitchable functional molecules
29. “Multiple Azoarenes Based Systems – Photoswitching, Supramolecular Chemistry and Application Prospects” Pravesh Kumar, Debapriya Gupta, Surbhi Grewal, Anjali Srivastava, Ankit Kumar Gaur and Sugumar Venkataramani* The Chemical Record, 2022, 22, e202200074. DOI
Invited review
Graphics Credit: Ankit Kumar Gaur
Photoswitching and photoswitchable functional molecules
28. “Light controlled shape-changing azomacrocycles exhibiting reversible modulation of pyrene fluorescence emission” Anjali Srivastava, Surbhi Grewal, Naimat K Bari, Sharmistha Sinha,* and Sugumar Venkataramani* Org. Biomol. Chem., 2022, 20, 5284-5292. DOI
Photoswitching and photoswitchable functional molecules
27. “Structure-Property Relationship for Visible Light Bidirectional Photoswitchable Azoheteroarenes and Thermal Stability of Z-isomers” Ankit Kumar Gaur,‡ Himanshu Kumar,‡ Debapriya Gupta,‡ Irin P. Tom,‡ Dhanyaj Nampoothiry, Sandeep Kumar Thakur, Anjali Mahadevan, Sanjay Singh,* and Sugumar Venkataramani* J. Org. Chem., 2022, 87, 10, 6541–6551, DOI (‡Equally contributed)
Photoswitching and photoswitchable functional molecules
26. “Solid-state photochromic arylazopyrazole based transition metal complexes” Debapriya Gupta,‡ Ankit Kumar Gaur,‡ Deepanshu Chauhan, Sandeep Kumar Thakur, Vaitheesh Jeyapalan, Sanjay Singh,* Gopalan Rajaraman,* and Sugumar Venkataramani* Inorg. Chem. Front., 2022, 9, 2315-2327, DOI (‡Equally contributed)
Photoswitching and photoswitchable functional molecules
25. “The curious case of the photochemistry of 2-hydroxyphenylazo-3,5-dimethylisoxazole: Unravelling the process among tautomerization, photoisomerization, and conformational changes” Chitranjan Sah#, Anjali Mahadevan#, Pravesh Kumar, Sugumar Venkataramani* Phys. Chem. Chem. Phys., 2022, 24, 7848-7855, DOI (#Equally contributed)
Photoswitching and photoswitchable functional molecules
24. “Deciphering internal and external π-conjugation in C3-symmetric multiple azobenzene connected systems in self-assembly” Surbhi Grewal#, Pravesh Kumar#, Saonli Roy, Indu Bala, Chitranjan Sah, Santanu Kumar Pal*, Sugumar Venkataramani* Chem. Eur. J., 2022, 28, e202104602 . DOI (#Equally contributed)
Photoswitching and photoswitchable functional molecules
22. “Pd-Catalyzed Formal [3 + 3] Heteroannulation of Allylic gem-Diacetates: Synthesis of Chromene-Based Natural Products and Exploration of Photochromic Properties" Prashant Kumar, Pravesh Kumar, Sugumar Venkataramani*, S. S. V. Ramasastry* ACS Catal. 2022, 12, 963–970. DOI (A collaborative work with Dr. Ramasastry Sripada, IISER Mohali)
Photoswitching and photoswitchable functional molecules
21. “Intermolecular CDC Amination of Remote and Proximal Unactivated Csp3–H Bonds Through Intrinsic Substrate Reactivity – Expanding Towards a Traceless Directing Group" Suresh Rajamanickam, Mayank Saraswat and Sugumar Venkataramani*, Bhisma K Patel* Chem. Sci., 2021, 12, 15318-15328. DOI (A collaborative work with Prof. Bhisma K. Patel, IIT Guwahati)
Radical Chemistry
20. “Tuning of Bistability, Thermal Stability of the Metastable States and Application Prospects in the C3 Symmetric Designs of Multiple Azo(hetero)arenes Systems” Debapriya Gupta#, Ankit Kumar Gaur#, Pravesh Kumar#, Himanshu Kumar#, Anjali Mahadevan#, Sudha Devi , Saonli Roy and Sugumar Venkataramani* Chem. Eur. J., 2021, 27, 3463-3472 . DOI (#Equally contributed)
Photoswitching and photoswitchable functional molecules
19. “Thermal Unimolecular Reactivity Pathways in Dehydro-diazines Radicals" Mayank Saraswat, Sugumar Venkataramani* J. Phys. Org. Chem. 2021, https://doi.org/10.1002/poc.4152 . DOI
Radical Chemistry
18. “Insights on Unimolecular and Bimolecular Reactivity Patterns of Pyridyl, Pyridyl-N-oxide, and Pyridinyl Radicals Through Spin Density” Chitranjan Sah#, Mayank Saraswat#, Lilit Jacob, Sugumar Venkataramani* Comput. Theor. Chem., 2020, DOI: https://doi.org/10.1016/j.comptc.2020.113025. (#Equally contributed)
Radical Chemistry
17. “Temporal control in tritylation reactions through light-driven variation in chloride ion binding catalysis – A proof of concept” Surbhi Grewal, Saonli Roy, Himanshu Kumar, Mayank Saraswat, Naimat K Bari , Sharmistha Sinha*, Sugumar Venkataramani* Catal. Sci. Technol., 2020, 10, 7027 - 7033 DOI: 10.1039/D0CY01090A . DOI
Photoswitching and photoswitchable functional molecules
16. “Bu4NI Catalyzed Radical Induced Regioselective N-Alkylations and Arylations of Tetrazoles Using Organic Peroxides/Peresters” Suresh Rajamanickam,† Chitranjan Sah,‡ Bilal Ahmad Mir,† Subhendu Ghosh,† Garima Sethi,§ Vinita Yadav,† Sugumar Venkataramani,‡* and Bhisma K. Patel†* J. Org. Chem., 2020, 85, 2118−2141 . DOI (A collaborative work with Prof. Bhisma K. Patel, IIT Guwahati)
Radical Chemistry
15. “Arylazo-3,5-dimethylisoxazoles – Azoheteroarene photoswitches exhibiting high Z-isomer stability, solid state photochromism and reversible light-induced phase transition” Pravesh Kumar, Anjali Srivastava, Chitranjan Sah, Sudha Devi and Sugumar Venkataramani* Chem. Eur. J., 2019, 25, 11924 – 11932. DOI
Photoswitching and photoswitchable functional molecules
14. "Azoheteroarene photoswitches – Synthesis, Photoswitching and Utility" Surbhi Grewal#, Debapriya Gupta#, Ankit Kumar Gaur#, Mayank Saraswat#, and Sugumar Venkataramani* book chapter in “Photoisomerization: Causes, Behavior and Effects” Ed.; Diego Sampedro, Nova Publishers, USA, 2019. (#Equally contributed) Link
Invited book chapter
Photoswitching and photoswitchable functional molecules
13. “Reversibly photoswitchable alkoxy azobenzenes connected benzenetricarboxamide discotic liquid crystals with perpetual long range columnar assembly” Sudha Devi‡, Indu Bala‡, Santosh Prasad Gupta, Pravesh Kumar, Santanu Kumar Pal* and Sugumar Venkataramani* Org. Biomol. Chem., 2019, 17, 1947-1954. DOI (‡Equally contributed)
Invited article for the themed collection: New Talent 2019
Photoswitching and photoswitchable functional molecules
12. “Tripodal N‐Functionalized Arylazo‐3,5‐dimethylpyrazole Derivatives of Trimesic Acid: Photochromic Materials for Rewritable Imaging Applications” Sudha Devi‡ , Ankit Kumar Gaur‡ , Debapriya Gupta‡ , Mayank Saraswat‡ , Sugumar Venkataramani* ChemPhotoChem, 2018, 2, 806-810. DOI (‡Equally contributed)
Photoswitching and photoswitchable functional molecules
11. “Deciphering Stability of Five-Membered Heterocyclic Radicals: Balancing Act Between Delocalization and Ring Strain” Chitranjan Sah#, Ajit Kumar Yadav#, Sugumar Venkataramani* J. Phys. Chem. A, 2018, 122 (24), 5464–5476. DOI: (#Equally contributed)
Radical Chemistry
10. “Evaluation of Substituent Effect in Z-Isomer Stability of Arylazo-1H-3,5-dimethylpyrazoles – Interplay of Steric, Electronic Effects and Hydrogen Bonding” Sudha Devi, Mayank Saraswat, Surbhi Grewal, Sugumar Venkataramani* J. Org. Chem., 2018, 83, 8, 4307-4322. DOI
Photoswitching and photoswitchable functional molecules
9. “Through bond and through space interactions in dehydro-diazine radicals: A case study of 3c-5e interactions” Mayank Saraswat#, Sugumar Venkataramani* Phys. Chem. Chem. Phys. 2018, 20, 4386-4395. DOI
Radical Chemistry
8. “Does Nitrogen Lone Pair Lead to Two Centered - Three Electrons (2c-3e) Interactions in Pyridyl Radical Isomers?” Chitranjan Sah#, Lilit Jacob#, Mayank Saraswat#, Sugumar Venkataramani* J. Phys. Chem. A., 2017, 121 (19), 3781-3791. DOI (#Equally contributed)
Radical Chemistry
7. “Dehydro-oxazole, thiazole and imidazole radicals: insights into the electronic structure, stability and reactivity aspects” Anamika Mukhopadhyay, Lilit Jacob, Sugumar Venkataramani* Phys. Chem. Chem. Phys. 2017, 19, 394-407. DOI
Radical Chemistry
Contribution through doctoral and postdoctoral work
6. “Rational design of a room temperature molecular spin switch. The light-driven coordination induced spin state switch (LD-CISSS) approach” Marcel Dommaschk, Christian Schuett, Sugumar Venkataramani, Umasish Jana, Christian Naether, Frank D. Soennichsen, Rainer Herges. Dalton Trans., 2014, 43, 17395-17405. DOI
5. "Molecular Switch" Rainer Herges, Olav Jansen, Felix Tuczek, Sugumar Venkataramani US20130202538A1. (Also published as DE102010034496A1, EP2605774A1, WO2012022299A1 Patent)
4. “The Magnetic Bistability of Molecules in Homogeneous Solution at Room Temperature” Sugumar Venkataramani, Umasish Jana, Marcel Dommaschk, Frank D. Soennichsen, Felix Tuczek, Rainer Herges. Science, 2011, 331, 445. DOI
3. “The 1,2,3-tridehydrobenzene triradical: 2B or not 2B? The answer is 2A!” Lucas Koziol, Michael Winkler, K.N. Houk, Sugumar Venkataramani, Wolfram Sander, Anna I. Krylov, J. Phys. Chem. A. 2007, 111, 5071. DOI
2. “Trifluoro-1,3,5-tridehydrobenzene” Sugumar Venkataramani, Michael Winkler, Wolfram Sander, Angew. Chem. Int. Ed.Engl. 2007, 46, 4888., Angew. Chem. 2007, 119, 4974. (Frontispiece) DOI
1. “1, 2, 3-Tridehydrobenzene” Sugumar Venkataramani, Michael Winkler, Wolfram Sander, Angew. Chem. Int. Ed. Engl. 2005, 44, 6306., Angew. Chem. 2005, 117, 6464. (Frontispiece) DOI
PhD Thesis from our group:
1. Ms. Sudha Devi (PH12121) "Tuning, Controlling and Applications of Cis-Isomer Stability in Azoheteroarenes and Multiple Azoarenes Connected Systems" (Thesis defended on 22/11/2018)
2. Mr. Mayank Saraswat (MP13007) "Matrix-Isolation Infrared Spectroscopic and Computational Studies of Dehydrodiazine Radicals" (Thesis defended on 09/06/2021)
3. Mr. Chitranjan Sah (MP13012) "Computational and Matrix Isolation Studies of Heterocyclic Radicals and Azoheteroarene Photoswitches" (Thesis defended on 01/12/2021)
4. Ms. Surbhi Grewal (PH16021) "Photoswitchable Molecular Systems for Supramolecular Assembly and Reversible Modulation of Catalysis" (Thesis defended on 02/09/2022)
5. Mr. Pravesh Kumar (PH16040) "Light modulation of properties of arylazoisoxazole photoswitches and their benzene-1,3,5-tricarboxamide (BTA) functionalized derivatives" (Thesis defended on 16/09/2022)
6. Ms. Anjali Srivastava (MP15012) "Azobenzene-based Supramolecular Systems for Light Controlled and Reversible Fluorescence Modulation of Guest, Hydrogelation, and Multianalyte Probes" (Thesis defended on 28/02/2023)
7. Mr. Ankit Kumar Gaur (PH16040) "Azoheteoarene photoswitches: Structure-property relationships towards photoswitching using visible light, in the water medium, and solid-state" (Thesis defended on 01/06/2023)
8. Ms. Debapriya Gupta (MP15001) "Exploring photoisomerization behaviour of single and multiple-azo(hetero)arene units-connected organic systems, ligands, metal complexes, and their applications" (Thesis defended on 14/12/2023)
Master Thesis from our group:
29. Dheeraj Kumar Meena (MS18015) (April 2023)
28. Kshitesh Lingala (MS17053) (April 2023)
27. Sajal Nawaria (MS17017) (April 2022)
26. Roshan Nasare (MS17031) (April 2022)
25. Hrishikesh (MS17027) (April 2022)
24. Sreelakshmi (MS16178) (May 2021)
23. Dhanyaj N Nampoothiry (MS16176) (May 2021)
22.Harjasnoor Kakkar (MS16172) (June 2021)
21. Hunarpreet Kaur (MS16162) (June 2021)
20. Lincoln (MS15076) "Computational and Matrix Isolation Infrared Spectroscopic Studies of Dehydrobenzyl-alcohol Radicals" (May 2020)
19. Anees Rahman (MS15018) "Photoswitchable Ionic Liquids" (May 2020)
18. Irin P. Tom (MS14178) "Azoheteroarene based photoswitches" (April 2019)
17. Vaitheesh Jaipal (MS14007) "Azoheteroarene based ligands for metal binding and solid state photochromism" (April 2019)
16. Amal Sam Sunny (MS14176) "Synthesis and Studies of Azoarene and Azoheteroarene Connected Benzene Carboxamides as Potential Photoresponsive Liquid Crystals" (April 2019)
15. Virinder Bhagat (MS14026) "Computational and Matrix Isolation Infrared Spectroscopic Studies of 2-Dehydroacetophenone Radical" (April 2019)
14. Divanshu Gupta (MS14013) "Computational and Matrix Isolation Infrared Spectroscopic Studies of Hydroxypyridyl and Pyridyloxy Radicals" (April 2019)
13. Amandeep Singh, (MS14001) "Computational and Spectroscopic Studies of Bimolecular Complexes of Pyridine-N-oxide with water and Attempts Towards 2-Dehydrothiazole Radical" (April 2019)
12. Ankit Somani (MS13092) "Controlling Conformational Preferences of Dehydro-2,2',6,6'-tetrafluorobiphenyl Biradicals Towards Designing High Spin Systems" (April 2018)
11. Virender Singh (MS13015) "Synthesis of Azobenzene Based Probes for Reversible Metal Ion Binding and Releasing" (April 2018)
10. Ajit Kumar Yadav (MS12024) "Computational Studies on Five Membered Heterocyclic Open-Shell Systems and Setting up of Matrix Isolation IR Spectroscopy " (April 2017)
9. Athira T. John (MS11029) "Synthesis and Photoswitching Studies of Water Soluble Azobenzene Based Molecules" (April 2016)
8. Anjali Mahadevan (MS11077) "Synthesis and Antioxidant Studies of Some Pyridine Connected α,β- unsaturated Acrylamides as Potential FAB Inhibitors" (April 2016)
7. Rashmi Sinha (MS11084) "Synthesis and photoswitching studies of azobenzene based molecular transporter and photoswitchable ligands" (April 2016)
6. Aman Kumar Bhonsle (MS11071) "Synthetic attempts in connecting multiple azobenzenes through amide and alkyne linkers" (April 2016)
5. Ravinder Singh (MS10103) "Conformational analysis of bis-triazole derivatives using computational studies in understanding aryl C-H---anion interaction" (April 2016)
4. Devender Kumar (MS09049) "Further Exploration on Reactivity of Diazonium Salts with Selective Nucleophiles and Enolates" (April 2016)
3. Ravi Ranjan (MS10102) "Attempts towards making photoswitchable molecular transporter and functionalization of 4-aminoazobenzene" (April 2015)
2. Ashish Kumar (MS10043) "Synthesis of some pyridine substituted alpha, beta unsaturated amides as potential Bacterial fatty acid biosynthesis enoyl ACP reductase inhibitors" (April 2015)
1. Lilit Jacob (MS10061) "Synthesis of some Heck Coupled Pyridine Derivatives of Acrylamide and Acrylic acid as Potential Bacterial Fatty Acid Biosynthesis Inhibitors" (April 2015)