@article {48959, title = {Ligand-free one-pot synthesis of Ru/W18O49 self-assembled hierarchical coral-like nanostructures for selective conversion of glucose into glycols}, journal = {ACS Applied Nano Materials }, volume = {6}, year = {2023}, month = {DEC }, pages = {22635-22642}, type = {Journal Article}, abstract = {

In this study, we report a simple inorganic route for the synthesis of Ru/W18O49 self-assembled coral-like nanostructures, with the following advantages: It is one step and requires no surfactant or stabilizing agent; Ru loading is easily tuned, and the as-synthesized nanomaterials can be used as a catalyst without any further processing. The preliminary investigations of the catalytic performance of these as-synthesized Ru/W18O49 nanomaterials appear quite promising for converting glucose to glycols. The total glycol selectivity of 82.6\% with 100\% conversion of glucose was obtained over 0.03 wt \% Ru loading on tungsten nanostructures, which turns out to be the lowest Ru loading\% on support reported to date to achieve the highest total glycol selectivity among the previously reported catalyst based on Ru-nano/composite materials. Additionally, preliminary results show that the concentration of Ru on W18O49 significantly affects the selectivity of the glycol production. Thus, our methodology will open up a wide range of opportunities regarding the choice of metals, stoichiometric/nonstoichiometric WOx (x=1-3) as support, and the viability of further catalytic manipulations. A probable catalytic mechanism for this catalytic process is also proposed.

}, keywords = {glycols, Nanostructure, One-pot synthesis, ruthenium (Ru), selective conversion of glucose, tungsten oxide (W18O49)}, doi = {10.1021/acsanm.3c04200}, author = {Patil, Manoj Krishnat and Gaikwad, Supriya Hanmant and Kirali, Arun Arunima Balachandran and Marimuthu, Banu and Mukherjee, Shatabdi Porel} } @article {49405, title = {Lead-free low-dimensional tetraalkylammonium manganese- and copper-based hybrid organic{\textendash}inorganic perovskites for visual fluorometric Pb2+ ion detection}, journal = {ACS Applied Optical Materials}, volume = {2}, year = {2024}, month = {JUL}, pages = {1533{\textendash}1545}, type = {Article}, abstract = {

For the first time, we have synthesized lead (Pb)-free manganese (Mn)- and copper (Cu)-based hybrid organic{\textendash}inorganic perovskite (HOIP) compounds, compound\ 1, (TEA)2MnBr4, compound\ 2, (TBA)2MnBr4, compound\ 3, (TEA)2CuBr4, and compound\ 4, (TBA)CuBr2\ (where TEA is tetraethylammonium and TBA is tetrabutylammonium), under ambient conditions via mechanochemical synthesis methodology using a Kakuhunter-made planetary mixer. The compounds are characterized as 2D except for (TBA)CuBr2, which has crystallized in the 0D lattice. The synthesized compounds are phase pure and show a stable solid-state emission at room temperature. The Mn-based perovskite compound\ 1\ showed excellent environmental photostability for over a month and reasonable stability under a relative humidity of 70{\textendash}80\%. The nanoparticle (NP) dispersions of compounds\ 1\ and\ 2\ were used further for fluorescence titration studies using various heavy metal cations, including transition metals and lanthanides (e.g., Y3+, Nb3+, Co2+, Ni2+, Ag+, Zn2+, Cd2+, Pb2+, Gd3+, and Dy3+), where they showed good fluorescence switching by the Pb2+\ ion. Compound\ 1\ demonstrated excellent fluorescence switching performance with Pb2+\ titration with a Pb2+\ detection limit of 2.43 {\texttimes} 10{\textendash}8\ M and hence can be used to fabricate a Pb2+\ calorimetric sensor. A preliminary visual thin film-based sensor using NPs of compound\ 1\ was fabricated to test the change in emission from blue to green in correlation with the results obtained in the NP solution during Pb2+\ ion sensing. A fascinating in situ ion-exchange-based mechanism for the sensitivity of NPs of compound\ 1\ is confirmed. This study reveals the ability of Pb-free Mn-based HOIPs to detect an oxidizing metal cation, Pb2+, efficiently and quantitatively.

}, doi = {10.1021/acsaom.4c00182}, url = {https://pubs.acs.org/doi/10.1021/acsaom.4c00182}, author = {Kour, Prachi and Sahu, Pragati and Dambhare, Neha V. and Rath, Arup Kumar and Mukherjee, Shatabdi Porel} }