A5088636673- Catalytic Cross-Coupling Reactions
- N-Heterocyclic Carbenes in Organic and Inorganic Chemistry
- Organic Light-Emitting Diodes Research
- Asymmetric Hydrogenation and Catalysis
- Catalytic C–H Functionalization Methods
- CO2 Reduction Techniques and Catalysts
- Synthesis and biological activity
- Organometallic Complex Synthesis and Catalysis
- Metal complexes synthesis and properties
- Crystallography and molecular interactions
- Synthesis and Characterization of Heterocyclic Compounds
- Crystallization and Solubility Studies
- Magnetism in coordination complexes
- Metal-Catalyzed Oxygenation Mechanisms
- Radical Photochemical Reactions
- Multicomponent Synthesis of Heterocycles
- Molecular Junctions and Nanostructures
- X-ray Diffraction in Crystallography
- Cyclopropane Reaction Mechanisms
- Chemical Synthesis and Analysis
- Organoselenium and organotellurium chemistry
- Chemical Synthesis and Reactions
- Porphyrin and Phthalocyanine Chemistry
- Nanocluster Synthesis and Applications
- Oxidative Organic Chemistry Reactions
Lund University
2016-2025
Central Institute of Medicinal and Aromatic Plants
2024
Ministry of AYUSH
2022-2023
Teerthanker Mahaveer University
2023
Vivekananda Global University
2023
Galgotias University
2023
Central Council for Research in Ayurvedic Science
2022
Chonnam National University
2021
Chemical Synthesis Lab
2020
Skåne University Hospital
2016
Iron's abundance and rich coordination chemistry are potentially appealing features for photochemical applications. However, the photoexcitable charge-transfer states of most iron complexes limited by picosecond or subpicosecond deactivation through low-lying metal-centered states, resulting in inefficient electron-transfer reactivity complete lack photoluminescence. In this study, we show that octahedral iron(III) two mono-anionic facial tris-carbene ligands can markedly suppress such...
The iron carbene complex [FeII(btz)3](PF6)2 (where btz = 3,3′-dimethyl-1,1′-bis(p-tolyl)-4,4′-bis(1,2,3-triazol-5-ylidene)) has been synthesized, isolated, and characterized as a low-spin ferrous complex. It exhibits strong metal-to-ligand charge transfer (MLCT) absorption bands throughout the visible spectrum, excitation of these gives rise to 3MLCT state with 528 ps excited-state lifetime in CH3CN solution that is more than one order magnitude longer compared MLCT any previously reported...
Three new N-alkyl-N′-(2-ethyl-1-selenophenyl)imidazolium salts, L1–L3 (differing in the chain length of alkyl substituent N), which are precursors to (Se, CNHC) ligands and their N-heterocyclic carbene (NHC) complexes [Pd(L-HX)Cl2] (1–3) [L = L1–L3, X I/Br], have been synthesized characterized by multinuclear NMR HR-MS. For synthesis Pd 1–3 from appropriate imidazolium salts (L1–L3), route silver transfer reaction has adopted. Single-crystal structures 1 2 established with X-ray diffraction....
Despite a few reports of photoluminescent and strongly photo-oxidizing transition metal complexes with d5 electronic configuration, the photophysics photochemistry this class have largely remained unexplored. Recent investigations earth-abundant iron(III) N-heterocyclic carbene (NHC) demonstrated promising photophysical photochemical properties associated low-spin (doublet) ligand-to-metal charge transfer (2LMCT) excitations, including nanosecond photoluminescence (PL) capabilities to drive...
The Pd17Se15 nanoparticles, synthesized for the first time from a single source precursor [Pd(L)Cl2] {L = 1,3-bis(phenylselenyl)propan-2-ol} and grafted onto graphene oxide, show high catalytic activity in C-O coupling between aryl/heteroaryl chlorides/bromides phenol at room temperature (Pd loading 1 mol%; yield up to 94%).
Iron N-heterocyclic carbene (NHC) complexes have received a great deal of attention recently because their growing potential as light sensitizers or photocatalysts. We present sub-ps X-ray spectroscopy study an FeII NHC complex that identifies and quantifies the states involved in deactivation cascade after absorption. Excited molecules relax back to ground state along two pathways: After population hot 3 MLCT state, from initially excited 1 30 % undergo ultrafast (150 fs) relaxation MC...
Photoinduced bimolecular charge transfer processes involving the iron(III) N-heterocyclic carbene (FeNHC) photosensitizer [Fe(phtmeimb)2]+ (phtmeimb = phenyltris(3-methyl-imidazolin-2-ylidene)borate) and triethylamine as well N,N-dimethylaniline donors have been studied using optical spectroscopy. The full photocycle of separation recombination down to ultrashort time scales was by investigating excited-state dynamics up high quencher concentrations. unconventional doublet ligand-to-metal...
Fe(III) complexes with N-heterocyclic carbene (NHC) ligands belong to the rare examples of Earth-abundant transition metal long-lived luminescent charge-transfer excited states that enable applications as photosensitizers for charge separation reactions. We report three new hexa-NHC this class: [Fe(brphtmeimb)2]PF6 (brphtmeimb = [(4-bromophenyl)tris(3-methylimidazol-2-ylidene)borate]–, [Fe(meophtmeimb)2]PF6 (meophtmeimb [(4-methoxyphenyl)tris(3-methylimidazol-2-ylidene)borate]–, and...
Iron N-heterocyclic carbene (FeNHC) complexes with long-lived charge transfer states are emerging as a promising class of photoactive materials. We have synthesized [FeII(ImP)2] (ImP = bis(2,6-bis(3-methylimidazol-2-ylidene-1-yl)phenylene)) that combines ligands cyclometalation for additionally improved ligand field strength. The 9 ps lifetime its 3MLCT (metal-to-ligand transfer) state however reveals no benefit from compared to Fe(ii) NHC/pyridine or pure NHC sets. In acetonitrile solution,...
An Fe( ii ) complex bearing tris(carbene)borate ligands with imidazol-2-ylidene donors shows marked destabilization of metal centered states by the strongly σ-donating ligands. Yet, its high-energy 3 MLCT state is rapidly deactivated via a MC state.
The in situ generated ArE¯ (E = S or Se) reacts with (2-chloromethyl)pyridine N2 atmosphere, resulting half-pincer (N, S/Se) ligands (2-arylchalcogenomethyl)pyridine (L1–L3; aryl Ph/2-pyridyl for S, Ph Se). Half-sandwich complexes [(η5-Cp*)Rh(L)Cl][PF6] (1, 2), [(η5-Cp*)Rh(L2)CH3CN][PF6]2 (3), and [(η5-Cp*)Ir(L)Cl][PF6] (4–6), where L L1–L3, have been synthesized by reacting [(η5-Cp*)RhCl(μ-Cl)]2 [(η5-Cp*)IrCl(μ-Cl)]2 respectively. characterized IR, HR-MS, 1H, 13C{1H}, 77Se{1H} NMR spectra....
The reactions of 2-(pyridine-2-ylmethylsulfanyl)benzoic acid (L) with [(η5-Cp*/η6-benzene)MCl(μ-Cl)]2, (benzene, M = Ru; Cp*, Rh, Ir) at room temperature followed by treatment NH4PF6 result in a new class water-soluble half-sandwich complexes [(η5Cp*/η6-benzene)M(L)Cl][PF6] (1–3, respectively, for Ru, Ir). Their characteristic HR-MS and 1H 13C{1H} NMR spectra have been found. single-crystal structures 1–3 established X-ray crystallography. Ru–S, Rh–S, Ir–S bond lengths are 2.4079(6),...
The reactions of 1,2-bis(phenylthiomethyl)benzene(L1) and 1,2-bis(phenylselenomethyl)benzene(L2) with [(η5-Cp*)MCl(μ-Cl)]2 (M = Rh or Ir) at room temperature, followed by treatment NH4PF6 have resulted in air moisture insensitive half-sandwich complexes composition [(η5-Cp*)M(L)Cl][PF6] (Rh, 1–2; Ir, 3–4; L L1 L2). Their HR-MS, 1H, 13C{1H}, 77Se{1H} NMR spectra were found to be characteristic. single crystal structures 1–4 been established X-ray crystallography. efficient for catalytic...
Iron-based photosensitizers for dye-sensitized solar cells with a rod-like push–pull design. Solar cell performance was limited by ultrafast (sub-ps) recombination, but yielded better than the homoleptic parent photosensitizer.
The half sandwich complexes [(η6-C6H6)Ru(L)Cl][PF6] (1–5) have been synthesized by the reactions of (2-arylchalcogenomethyl)pyridine [L = L1–L3] and bis(2-pyridylmethyl)chalcogenide L4–L5] (chalcogen S, Se; Ar Ph/2-pyridyl for Ph Se) with [(η6-C6H6)RuCl2]2, at room temperature followed treatment NH4PF6. Their HR-MS, 1H, 13C{1H} 77Se{1H} NMR spectra found characteristic. single crystal structures 1–5 established X-ray crystallography. Ru has pseudo-octahedral "piano-stool" geometry. efficient...
Complexes [AgL(NO3)CH3CN](1) and [AgLNO3] (2) were formed on reacting AgNO3 with L in acetonitrile for 12 h (at room temperature) 24 90 °C), respectively, where is a (S,N,S) pincer ligand, 4,5-bis(phenylthiomethyl)acridine, synthesized by the reaction of situ generated PhS(-) 4,5-bis(bromomethyl)acridine under N2 atmosphere. (1)H (13)C{(1)H} NMR mass spectra its two Ag-complexes characterized. The structures complexes 1 2 established single crystal X-ray crystallography. Ag-S bond distances...
A homoleptic organometallic FeIV complex that is stable in both solution and the solid state at ambient conditions has been synthesized isolated as [Fe(phtmeimb)2 ](PF6 )2 (phtmeimb=[phenyl(tris(3-methylimidazolin-2-ylidene))borate]- ). This N-heterocyclic carbene (NHC) was characterized by 1 H NMR, HR-MS, elemental analysis, scXRD electrochemistry, Mößbauer spectroscopy, magnetic susceptibility. The two latter techniques unequivocally demonstrate a triplet low-spin S=1 ground state,...
The nanostructured magnetic oxide Fe3O4 has been coated with silica and then reacted phenylselenyl chloride under a N2 atmosphere RuCl3·xH2O successively in an aqueous medium to prepare Fe3O4@SiO2@SePh@Ru(OH)x nanoparticles (NPs) for the first time. These magnetically retrievable NPs have authenticated using TEM, SEM-EDX powder-XRD found be efficient catalyst one pot conversion (organic solvent not required) of aldehydes, nitriles benzyl amine primary amides water. For aldehydes nitriles,...
The PdTe NPs (hexagonal) and nanorods (first example) have been synthesized for the first time from single source precursors (SSPs), [Pd(L1)Cl2] (1) [Pd(L2)Cl]BF4 (2) [L1, 4-bromo-1-[2-(4-methoxyphenyltellanyl)ethyl]-1H-pyrazole; L2, bis-[2-(4-bromopyrazol-1-yl)ethyl]telluride], by their thermolysis in an OA–ODE mixture (1:1) TOP respectively. composition of phase does not change with SSP/solvent. Complex 2 gives small size nanostructures.
Abstract Activation of Suzuki coupling with a complex palladium varies the mode coordination its ligand. The moisture‐/air‐insensitive palladacycles and complexes designed using same ligand (Schiff base, coordinating as an N,C – N,O ligand, respectively) have been found to follow different pathways. Palladacycles are more efficient, their 0.001 mol‐% loading gives good conversion (yield > 90 %) in several cases. Higher than this is required for Pd obtain similar yield. involves role...
The air- and moisture-insensitive half-sandwich complexes [(η5-Cp*)Rh(L)Cl][PF6] (1–3) [(η5-Cp*)Ir(L)Cl][PF6] (4–6) have been prepared by reacting L = L1–L3 (1,2-bis(phenylthio)ethane (L1), 1-(phenylseleno)-2-(phenylthio)ethane (L2) 1,2-bis(phenylseleno)ethane (L3)) with [(η5-Cp*)RhCl(μ-Cl)]2 [(η5-Cp*)IrCl(μ-Cl)]2, respectively, at room temperature followed treatment NH4PF6. Their HR-MS 1H, 13C{1H}, 77Se{1H} NMR spectra authenticated them. single-crystal structures of 1–6 established X-ray...