Green synthesis of silver nanoparticles from whole plant extract analyzed for characterization, antioxidant, and antibacterial properties

In this analysis, A green synthesis method utilizing a plant extract derived from Rumex nepalensis (spreng) was employed to synthesize silver nanoparticles. The synthesized nanoparticles were thoroughly characterized for their structural, surface morphological, optical, antioxidant, and antibacterial properties. Structural analysis revealed a face-centered cubic structure, while FTIR analysis confirmed the presence of biosurfactant molecules in the leaf extract that acted as reducing agents. SEM and TEM analyses further confirmed the spherical shape of the nanoparticles, with a size range of 19-28 nm. The evaluation of the silver nanoparticles demonstrated their antioxidant and antibacterial properties. These nanoparticles exhibited activities in both antioxidant and antimicrobial realms, showcasing their potential as dual-functional agents. This study highlights the effectiveness of the green synthesis method using Rumex nepalensis (spreng) extract for the production of silver nanoparticles with desirable properties for various applications

Reactivity of titanium imidazolin-2-iminato complexes with 2,6-diisopropylaniline and 2-{(2,6-diisopropylphenyl)-iminomethyl}pyrrole

We report the reactions of imidazolin-2-iminato titanium complexes [(ImRN)Ti(NMe2)3] (R = Mes, 2b; R = Dipp, 2c; Mes = mesityl, Dipp = 2,6-diisopropylphenyl) with 2,6-diisopropylaniline in a 1:3 molar ratio to yield the titanium imido complexes of composition [(ImRNH)Ti = N(Dipp)(HNDipp)2] (R = Mes, 3b; R = Dipp, 3c) in good yield by the Ti-Niminato bond cleavage at 60 °C. In contrast, the reaction of [(ImRN)Ti(NMe2)3] with 2,6-diisopropylaniline in a 1:1 molar ratio afforded mono-substituted products [(ImRN)Ti(NMe2)2(HNDipp)] (R = Mes, 4b; R = Dipp, 4c) in good yield. The reaction of [(ImRN)Ti(NMe2)3] with the iminopyrrole ligand [2-(2,6-iPr2C6H3-N = CH)C4H3NH] (NDippPyH) in a 1:1 ratio afforded mixed ligands, titanium complexes [(ImRN)Ti(NMe2)2(NDipp-Py)] (R = tBu, 5a; R = Dipp, 5c) with imidazolin-2-iminato and iminopyrrolide ligands. Molecular structures of 3b, 3c, 4c, 5a, and 5c were determined by single-crystal X-ray analysis. The solid-state structures of 3b and 3c clearly indicate the formation of true Ti = N double bonds, measuring 1.730(2) Å and 1.727(1) Å, respectively. The solid-state structures of 5a and 5c reveal the formation of five-coordinate titanium complexes

Reaction of sterically congested NHC–Zn(CH₂CH₃)₂ with substituted phenols leading to zincate complexes

<div><p>We report the reaction of a sterically congested NHC–Zn(CH₂CH₃)₂ Lewis adduct (<b>1</b>) prepared through reaction of an equimolar ratio of 1,3-di-tert-butylimidazol-2-ylidene and diethyl zinc, with various substituted phenols (4-tert-butyl-phenol, 2,6-di-tert-butyl-4-methyl phenol, and 1-bromo-4,6-di-tert-butyl phenol). The NHC–Zn dative bond was cleaved in each of the reactions with the substituted phenols to afford the corresponding ionic complexes of imidazolium cation and aryloxo-zincate, [{(4-CMe₃C₆H₄O)₂Zn(<i>μ</i>-OC₆H₄-4-CMe₃)}₂{(1,3-(CMe₃)_2-ImCH}₂] (<b>2</b>), [{(2,6-(CMe₃)₂-4-Me-C₆H₃O)₂}Zn{(1,3-(CMe₃)_2-ImCH}] (<b>3</b>), and [{(1-Br-3,5-(CMe₃)₂C₆H₂O)₂}_2-Zn{(1,3-(CMe₃)_2-ImCH}] (<b>4</b>), where 1,3-(CMe₃)_2-ImCH) is imidazolium carbocation. The molecular structures of <b>1–4</b> were established by X-ray diffraction analyses and from the solid-state structures of <b>2–4</b>, it was confirmed that, in all the compounds, zinc ions are coordinated through substituted phenolate groups.</p></div

Amidophosphine–Borane Complexes of Alkali Metals and the Heavier Alkaline-Earth Metals: Syntheses and Structural Studies

The <i>N</i>-benzhydrylamido-1,1-diphenylphosphine–borane ligand [Ph₂P­(BH₃)­NH­(CHPh₂)] (<b>1-H</b>) has been prepared via the reaction of an equimolar ratio of the phosphine amine [Ph₂PNH­(CHPh₂)] and the borane adduct [BH₃·SMe₂] at an ambient temperature. The reaction of <b>1-H</b> with ((trimethylsilyl)­methyl)­lithium (neosilyllithium), [LiCH₂SiMe₃], afforded a three-membered lithium amidophosphine–borane complex with the composition ([η²-Ph₂CHNP­(BH₃)­Ph₂)­Li­(THF)₂] (<b>2</b>). Analogous reactions with sodium and potassium bis­(trimethylsilyl)­amides at ambient temperature yielded the respective alkali-metal amidophosphine–borane complexes [{(Ph₂CHNP­(BH₃)­Ph₂)­Na­(THF)₂}₂] (<b>3</b>) and [{(Ph₂CHNP­(BH₃)­Ph₂)­K­(THF)₂}₂] (<b>4</b>), with the loss of hexamethyldisilazane, [(Me₃Si)₂NH]. The corresponding heavier alkaline-earth-metal complexes [M­(THF)₂{Ph₂P­(BH₃)­N­(CHPh₂)}₂] (M = Ca (<b>5</b>), Sr (<b>6</b>), Ba (<b>7</b>)) can be obtained via the reaction of [M­{N­(SiMe₃)₂}₂(THF)_<i>n</i>] (M = Ca, Sr, Ba) and <b>1-H</b>. The metal complexes <b>5</b>–<b>7</b> can also be prepared via a salt metathesis route, where the alkali-metal salts <b>3</b> and <b>4</b> were reacted with the respective metal diiodides in THF at ambient temperature. The molecular structures of <b>1-H</b> and <b>2</b>–<b>7</b> have been established by X-ray diffraction analyses, and from the solid-state structures of <b>3</b>–<b>7</b>, it was confirmed that, in all of the compounds, the metal ions are chelated through the nitrogen atom and the hydrogen atoms of the borane group of ligand <b>1-H</b>

Amidophosphine–Borane Complexes of Alkali Metals and the Heavier Alkaline-Earth Metals: Syntheses and Structural Studies

The <i>N</i>-benzhydrylamido-1,1-diphenylphosphine–borane ligand [Ph₂P­(BH₃)­NH­(CHPh₂)] (<b>1-H</b>) has been prepared via the reaction of an equimolar ratio of the phosphine amine [Ph₂PNH­(CHPh₂)] and the borane adduct [BH₃·SMe₂] at an ambient temperature. The reaction of <b>1-H</b> with ((trimethylsilyl)­methyl)­lithium (neosilyllithium), [LiCH₂SiMe₃], afforded a three-membered lithium amidophosphine–borane complex with the composition ([η²-Ph₂CHNP­(BH₃)­Ph₂)­Li­(THF)₂] (<b>2</b>). Analogous reactions with sodium and potassium bis­(trimethylsilyl)­amides at ambient temperature yielded the respective alkali-metal amidophosphine–borane complexes [{(Ph₂CHNP­(BH₃)­Ph₂)­Na­(THF)₂}₂] (<b>3</b>) and [{(Ph₂CHNP­(BH₃)­Ph₂)­K­(THF)₂}₂] (<b>4</b>), with the loss of hexamethyldisilazane, [(Me₃Si)₂NH]. The corresponding heavier alkaline-earth-metal complexes [M­(THF)₂{Ph₂P­(BH₃)­N­(CHPh₂)}₂] (M = Ca (<b>5</b>), Sr (<b>6</b>), Ba (<b>7</b>)) can be obtained via the reaction of [M­{N­(SiMe₃)₂}₂(THF)_<i>n</i>] (M = Ca, Sr, Ba) and <b>1-H</b>. The metal complexes <b>5</b>–<b>7</b> can also be prepared via a salt metathesis route, where the alkali-metal salts <b>3</b> and <b>4</b> were reacted with the respective metal diiodides in THF at ambient temperature. The molecular structures of <b>1-H</b> and <b>2</b>–<b>7</b> have been established by X-ray diffraction analyses, and from the solid-state structures of <b>3</b>–<b>7</b>, it was confirmed that, in all of the compounds, the metal ions are chelated through the nitrogen atom and the hydrogen atoms of the borane group of ligand <b>1-H</b>