00535nas a2200145 4500008004100000022001400041245008800055210006900143260000800212300000900220490000700229653002000236100001800256856011500274 2014 eng d a2053-273300aAnion-induced transition from supramolecular metallogel to metal organic frameworks0 aAnioninduced transition from supramolecular metallogel to metal  cMAY aC4620 v7010ametallohydrogel1 aKumar, Sushil uhttps://library.ncl.res.in/content/anion-induced-transition-supramolecular-metallogel-metal-organic-frameworks01171nas a2200205 4500008004100000245009300041210006900134260000800203300001400211490000700225520047500232100001900707700001800726700001700744700002200761700002500783700001700808700002000825856012000845 2017 eng d00aInterplaying anions in a supramolecular metallohydrogel to form metal organic frameworks0 aInterplaying anions in a supramolecular metallohydrogel to form  cAPR a3705-37080 v533 aThe remarkable effect of anions on the transition from supramolecular gels to crystalline phases has been described. An amino acid-based metallohydrogel was transformed into different metal-organic frameworks through the selective picking of anions. The metallohydrogel and the resulting metal-organic frameworks (MOFs) were thoroughly characterized. The results demonstrated controlled access over the binding of a particular anion to selectively form a particular MOF.1 aKarak, Suvendu1 aKumar, Sushil1 aBera, Saibal1 aDiaz, David, Diaz1 aBanerjee, Subhrashis1 aVanka, Kumar1 aBanerjee, Rahul uhttps://library.ncl.res.in/content/interplaying-anions-supramolecular-metallohydrogel-form-metal-organic-frameworks02353nas a2200169 4500008004100000245008000041210006900121260000800190300001400198490000800212520177300220100001901993700001802012700002102030700002002051856011202071 2018 eng d00aPorosity prediction through hydrogen bonding in covalent organic frameworks0 aPorosity prediction through hydrogen bonding in covalent organic cAPR a5138-51450 v1403 aEasy and bulk-scale syntheses of two-dimensional (2D) covalent organic frameworks (COFs) represent an enduring challenge in material science. Concomitantly, the most critical aspect is to precisely control the porosity and crystallinity of these robust structures. Disparate complementary approaches such as solvothermal synthesis have emerged recently and are fueled in part by the usage of different modulators and acids that have enriched the COF library. Yet, the fundamental understanding of the integral processes of 2D COF assembly, induding their growth from nucleating sites and the origin of periodicity, is an intriguing chemical question that needs to be answered. To address these cardinal questions, a green and easy-to-perform approach of COF formation has been delineated involving acid-diamine salt precursors. The role of hydrogen bonding [d(av)(N-amine-H center dot center dot center dot O-acid); d(av) signifies the average N-amine-H center dot center dot center dot O-acid distances, i.e., the average distance from the H atom of the amine to the O atom of the acid] present in the acid-diamine salts in improving the COFs' crystallinity and porosity has further been decoded by thorough crystallographic analyses of the salt molecules. What is particularly noteworthy is that we have established the hydrogen-bonding distances d(av)(N-amine-H center dot center dot center dot O-acid) in the acid-diamine salts that are pivotal in maintaining the reversibility of the reaction, which mainly facilitates highly crystalline and porous COF formation. Moreover, this reactant-structure to the product-quality relationship has further been utilized for the synthesis of highly crystalline and porous COFs that are unattainable by other synthetic means.1 aKarak, Suvendu1 aKumar, Sushil1 aPachfule, Pradip1 aBanerjee, Rahul uhttps://library.ncl.res.in/content/porosity-prediction-through-hydrogen-bonding-covalent-organic-frameworks06784nas a2200205 4500008004100000245010500041210006900146260000800215520603400223100002806257700001706285700002706302700001806329700002006347700001806367700002206385700002406407700002006431856012706451 2019 eng d00aZinc ion interactions in a two-dimensional covalent organic framework based aqueous zinc ion battery0 aZinc ion interactions in a twodimensional covalent organic frame cAUG3 a

The two-dimensional structural features of covalent organic frameworks (COFs) can promote the electrochemical storage of cations like H+, Li+, and Na+ through both faradaic and non-faradaic processes. However, the electrochemical storage of cations like Zn2+ ion is still unexplored although it bears a promising divalent charge. Herein, for the first time, we have utilized hydroquinone linked β-ketoenamine COF acting as a Zn2+ anchor in an aqueous rechargeable zinc ion battery. The charge-storage mechanism comprises of an efficient reversible interlayer interaction of Zn2+ ions with the functional moieties in the adjacent layers of COF (−182.0 kcal mol−1). Notably, due to the well-defined nanopores and structural organization, a constructed full cell, displays a discharge capacity as high as 276 mA h g−1 at a current rate of 125 mA g−1.

1 aMohammed, Abdul, Khayum1 aGhosh, Meena1 aVijayakumar, Vidyanand1 aHalder, Arjun1 aNurhuda, Maryam1 aKumar, Sushil1 aAddicoat, Matthew1 aKurungot, Sreekumar1 aBanerjee, Rahul uhttps://library.ncl.res.in/content/zinc-ion-interactions-two-dimensional-covalent-organic-framework-based-aqueous-zinc-ion02307nas a2200265 4500008004100000022001400041245015400055210006900209260000800278300001100286490000700297520133900304653002301643653003301666653002201699653003801721653002401759100001801783700001501801700002401816700002401840700002601864700002001890856013101910 2023 eng d a2352-940700aUnlocking the potential of proton conductivity in guanidinium-based ionic covalent organic nanosheets (iCONs) through pore interior functionalization0 aUnlocking the potential of proton conductivity in guanidiniumbas cAUG a1018660 v333 a

Recently, scientists have been exploring the incorporation of proton carriers such as water and phosphoric acid (PA) into the pores and channels of porous materials to enhance proton conduction performance. Ionic covalent organic nanosheets (iCONs) have been identified as promising functional materials due to their inbuilt ionic interfaces, which can facilitate strong interaction with counter ions present inside the pore structure and thus shorten ion transport pathways. However, there is a lack of research related to proton conductivity in iCONs loaded with PA. To address this, we prepared three functionalized guanidinium-based iCONs using a solvothermal condensation reaction between guanidinium amine (TG) and functionalized terephthaldehyde (Da, Dha, and Dma). PA was also incorporated into the iCON structure via ex situ loading to observe its effects on proton conduction performance. The results showed that both the iCONs and PA-iCONs were highly stable in water, organic solvents, acidic and basic media. Amongst these PA-iCONs, one with hydroxyl-functionalization (PA-DhaTG) displayed high proton conductivity at 90 degrees C and 95% relative humidity due to a Grotthuss mechanism for protons. These functionalized guanidinium-based iCONs could prove useful for applications in energy conversion devices.

10achemical stability10aFunctionalized pore interior10aGuanidinium group10aionic covalent organic nanosheets10aproton conductivity1 aKumar, Sushil1 aHu, Jiahui1 aPandikassala, Ajmal1 aKurungot, Sreekumar1 aAddicoat, Matthew, A.1 aSzekely, Gyorgy uhttps://library.ncl.res.in/content/unlocking-potential-proton-conductivity-guanidinium-based-ionic-covalent-organic-nanosheets02395nas a2200289 4500008004100000245015800041210006900199260000800268490000700276520133300283653002501616653003201641653002701673653001701700653002401717100003801741700003401779700001601813700002201829700001801851700001901869700002001888700001801908700003001926700001901956856013001975 2025 eng d00aHeteroatom-synergistic effect on anchoring polysulfides in chalcone-linked nanographene covalent organic frameworks for high-performance Li―S batteries0 aHeteroatomsynergistic effect on anchoring polysulfides in chalco cAPR0 v123 a

Lithium-sulfur (Li & horbar;S) batteries are an attractive option for future energy storage devices because they offer higher theoretical specific capacity, energy density, and cost-effectiveness than commercial lithium-ion batteries. However, the practical applications of Li & horbar;S batteries are significantly limited by the shuttle effect caused by intermediate lithium polysulfides (LiPSs) and slow redox kinetics. In this study, the molecular engineering of chalcone-linked, sp(2)-bonded nanographene-type covalent organic frameworks (COFs) as sulfur hosts is reported to enhance interactions with LiPSs, thereby effectively suppressing the shuttle effect. The developed sulfur-hosting cathode material demonstrated outstanding battery performance, surpassing most reported materials by achieving a specific capacity of 1228 mA h g(-1) at 0.5C, with 80% retention after 500 cycles and an average Coulombic Efficiency (C.E.) of 99%. Additionally, the mechanisms of sulfur immobilization, the subsequent conversion into lithium polysulfides (LiPSs), and their binding energies with COFs are investigated using density functional theory (DFT) calculations. These findings offer valuable insights into the structure-property relationships essential for developing more efficient sulfur-hosting cathodes.

10aanion-pi interaction10acovalent organic frameworks10alithium-sulfur battery10ananographene10apolysulfide shuttle1 aRanjeesh, Kayaramkodath, Chandran1 aJavaregowda, Bharathkumar, H.1 aGaber, Safa1 aBhauriyal, Preeti1 aKumar, Sushil1 aSkorjanc, Tina1 aFinsgar, Matjaz1 aHeine, Thomas1 aKrishnamoorthy, Kothandam1 aShetty, Dinesh uhttps://library.ncl.res.in/content/heteroatom-synergistic-effect-anchoring-polysulfides-chalcone-linked-nanographene-covalent