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Papers by Abbas Naziruddin

Research paper thumbnail of Sunlight-assisted photocatalytic degradation of azo-dye using zinc-sulfide embedded reduced graphene oxide

Solar Energy, Feb 1, 2023

Research paper thumbnail of Regulation of Nitric Oxide (NO) Release by Membrane Fluidity in Ruthenium Nitrosyl Complex-Embedded Phospholipid Vesicles

Research paper thumbnail of Magnetic Graphene Nanosheets from Expired Iron-Supplemented Tablets for Hydroxyl-Mediated Photocatalytic Oxidation of Azo Dyes

ACS Applied Nano Materials

Research paper thumbnail of Ruthenium Complexes Bearing Bis‐N‐heterocyclic Carbene Donors in TiO2 Sensitization for Dye‐Sensitized Solar Cells

European Journal of Inorganic Chemistry

This report presents ruthenium (II) complexes featuring bis‐imidazole‐2‐ylidene donors and carbox... more This report presents ruthenium (II) complexes featuring bis‐imidazole‐2‐ylidene donors and carboxylic acid‐functionalized terpyridine ligands (tpy−COOH or tpy4′−phenyl−COOH). We introduced the monodentate −NCS or pyridine carboxylate ligands into the coordination sphere to render sizeable changes in photo‐functional attributes. The coordination of the thiocyanate ligands to these ruthenium centers extends their absorption tails up to 800 nm. In contrast, the absorption bands of complexes featuring isonicotinic acid last only until 600 nm. Even though phenyl spacers at the acceptor end rendered a bathochromic shift in the λmax, in their absence, complexes exhibited a longer electron lifetime at the TiO2 photoanode. The complexes devoid of phenyl spacers show lower charge transfer resistance at the TiO2/electrolyte interface giving improved photon conversion efficiency (PCE) in Dye‐Sensitized Solar Cells (DSSCs). Herein, we analyze the relationship between the structure and the light‐...

Research paper thumbnail of CCDC 1507776: Experimental Crystal Structure Determination

An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Research paper thumbnail of Photo controlled release of nitric oxide (NO) from amphiphilic and nanoscale vesicles based ruthenium nitrosyl complex: NO release and cytotoxicity studies

Journal of Photochemistry and Photobiology A: Chemistry, 2022

Research paper thumbnail of Terpyridine Based Heteroleptic Ruthenium Complexes: Influence of Donor and Acceptor Ligands in Photosensitization

European Journal of Inorganic Chemistry

We report heteroleptic ruthenium complexes of terpyridine (tpy) ligands with directly linked carb... more We report heteroleptic ruthenium complexes of terpyridine (tpy) ligands with directly linked carboxylic acid anchors. These complexes feature methyl or methoxy‐substituted 4′−Phtpy as donor ligands. We prepared these heteroleptic complexes from the ruthenium (II) precursor via a milder route to preclude the homoleptic complex formation. The donor−acceptor arrangement of tpy ligands in these ruthenium complexes renders visible light absorption giving metal and ligand‐to‐ligand charge transfer excitations at c.a. 490 nm. We evaluate the effect of the tpy donor substituents on the light‐harvesting ability in Dye‐Sensitized Solar Cells (DSSCs) and compare their photosensitizing ability with heteroleptic complexes bearing phenyl spacer at the acceptor end. Further, scrutinizing their photovoltaic performance, we studied their electron transfer kinetics in DSSCs using electrochemical impedance spectroscopy. This paper presents the structure‐photosensitization relationship of these heterol...

Research paper thumbnail of Heteroleptic ruthenium(ii) complexes featuring N-heterocyclic carbene-based C^N donor sets for solar energy conversion

New Journal of Chemistry

Single isomers of heteroleptic ruthenium(ii) complexes with an N-heterocyclic carbene (NHC)-based... more Single isomers of heteroleptic ruthenium(ii) complexes with an N-heterocyclic carbene (NHC)-based C^N donor-set and NCS ligands in trans configurations are isolated. One of them depicted photovoltaic efficiency of ∼50% of the standard N3 dye under similar conditions.

Research paper thumbnail of Synthesis of Rhodium(I) Complexes Bearing Bidentate NH,NR-NHC/Phosphine Ligands

Research paper thumbnail of Ruthenium (II) Complexes Bearing Heteroleptic Terpyridine Ligands: Syntheses, Photophysics and Solar Energy Conversion

European Journal of Inorganic Chemistry

Research paper thumbnail of Direct C-metallation of N-substituted triazoles promoted by mercury acetate. An alternative route to N-heterocyclic carbene complexes

RSC Adv.

One-pot synthesis of C-bound triazolate complexes of mercury(ii) from N-substituted triazoles wit... more One-pot synthesis of C-bound triazolate complexes of mercury(ii) from N-substituted triazoles with Hg(OAc)2 have been achieved. Further methylation of one of these complexes yielded a monomeric N-heterocyclic carbene complex.

Research paper thumbnail of Formation of NH,NR N-Heterocyclic Carbene Complexes through Mercuration of Mono-N-substituted Benzimidazoles

European Journal of Inorganic Chemistry, 2016

Research paper thumbnail of Platinum Complexes Bearing Normal and Mesoionic N-Heterocyclic Carbene Based Pincer Ligands: Syntheses, Structures, and Photo-Functional Attributes

Dalton Trans., 2016

Platinum complexes featuring pyridine bis-N-heterocyclic imidazol-2-ylidene/triazol-5-ylidene don... more Platinum complexes featuring pyridine bis-N-heterocyclic imidazol-2-ylidene/triazol-5-ylidene donors are prepared and screened for vapo/mechanochromic attributes.

Research paper thumbnail of Correlating the Structural and Photo­physical Features of Pincer Luminophores and Monodentate Ancillary Ligands in Pt II Phosphors

European Journal of Inorganic Chemistry, 2015

Research paper thumbnail of Photofunctional Platinum Complexes Featuring N-heterocyclic Carbene-Based Pincer Ligands

Chemistry, an Asian journal, 2015

Photoactive platinum complexes of stoichiometry [Pt((R) CCC(R) )L](0/+) (R=Me, nBu and L=CN, C≡... more Photoactive platinum complexes of stoichiometry [Pt((R) CCC(R) )L](0/+) (R=Me, nBu and L=CN, C≡CPh, N≡CCH3 , Py, CO) featuring pincer-type bis N-heterocyclic carbene (NHC) ligands ((R) CCC(R) ) were synthesized. Organometallic syntheses of these complexes are facile and achievable through standard laboratory procedures. Control of intermolecular Pt⋅⋅⋅Pt interaction, π-π stacking, and emission tuning is achieved through suitable choice of the NHC-wingtip substituent (R) and the auxiliary ligand (L). Exposure to specific volatile organic compounds (VOCs) or mechanical grinding triggers changes in emission colors, which render these complexes photofunctional. Solid-state structures and photoluminescence results are described herein.

Research paper thumbnail of Bidentate NHC^pyrozolate ligands in luminescent platinum( ii ) complexes

Dalton Trans., 2015

The tuning of luminescence from blue to yellow was achieved with platinum complexes containing NH... more The tuning of luminescence from blue to yellow was achieved with platinum complexes containing NHC^pyrozolate and functionalized-phenyl-pyridine or triazole-pyridine ligands.

Research paper thumbnail of Bis-chelate N-heterocyclic tetracarbene Ru(II) complexes: Synthesis, structure, and catalytic activity toward transfer hydrogenation of ketones

Polyhedron, 2013

ABSTRACT Abstract Ru(II) complexes with two chelating di-N-heterocyclic carbenes (NHC) and two ac... more ABSTRACT Abstract Ru(II) complexes with two chelating di-N-heterocyclic carbenes (NHC) and two acetonitrile ligands (NHC = 1,1′-dialkyl-3,3′-methylene-diimidazol-2,2′-diylidene, and alkyl = methyl and n-butyl) were synthesized and structurally characterized. The crystal structures of the complexes determined by X-ray diffraction analyses show that the Ru(II) center is bound to two bidentate carbene ligands and two acetonitrile molecules, forming a distorted octahedron. The complexes prove to be an efficient catalyst having exceedingly high turnover frequencies and good reusability in transfer hydrogenation of ketones.

Research paper thumbnail of Synthesis, Characterization, and H-Bonding Abilities of Ruthenium(II) Complexes Bearing Bidentate NR,NH-Carbene/Phosphine Ligands †

Organometallics, 2010

N-(Diphenylphosphinoalkyl) benzimidazoles react with [RuCp*(μ3-Cl)] 4 under formation of complexe... more N-(Diphenylphosphinoalkyl) benzimidazoles react with [RuCp*(μ3-Cl)] 4 under formation of complexes bearing chelating NR, NH-functionalized NHC/phosphine ligands like in [7]. The N− H group of the NHC ligands in [6] and [7] can function as a hydrogen bond donor and ...

Research paper thumbnail of Ruthenium Complexes Bearing Unsymmetric CNC′ Pincer Ligands: Molecular Structures and Electronic Properties

Research paper thumbnail of Donor functionalized ruthenium N-heterocyclic carbene complexes in alcohol oxidation reactions

Dalton Transactions, 2014

Ruthenium chelates bearing N^C^O-donors in bidentate or pincer coordination modes have been prepa... more Ruthenium chelates bearing N^C^O-donors in bidentate or pincer coordination modes have been prepared. The ruthenium pincer complex catalyses the oxidation of alcohols to the corresponding aldehydes with yields as high as 99%.

Research paper thumbnail of Sunlight-assisted photocatalytic degradation of azo-dye using zinc-sulfide embedded reduced graphene oxide

Solar Energy, Feb 1, 2023

Research paper thumbnail of Regulation of Nitric Oxide (NO) Release by Membrane Fluidity in Ruthenium Nitrosyl Complex-Embedded Phospholipid Vesicles

Research paper thumbnail of Magnetic Graphene Nanosheets from Expired Iron-Supplemented Tablets for Hydroxyl-Mediated Photocatalytic Oxidation of Azo Dyes

ACS Applied Nano Materials

Research paper thumbnail of Ruthenium Complexes Bearing Bis‐N‐heterocyclic Carbene Donors in TiO2 Sensitization for Dye‐Sensitized Solar Cells

European Journal of Inorganic Chemistry

This report presents ruthenium (II) complexes featuring bis‐imidazole‐2‐ylidene donors and carbox... more This report presents ruthenium (II) complexes featuring bis‐imidazole‐2‐ylidene donors and carboxylic acid‐functionalized terpyridine ligands (tpy−COOH or tpy4′−phenyl−COOH). We introduced the monodentate −NCS or pyridine carboxylate ligands into the coordination sphere to render sizeable changes in photo‐functional attributes. The coordination of the thiocyanate ligands to these ruthenium centers extends their absorption tails up to 800 nm. In contrast, the absorption bands of complexes featuring isonicotinic acid last only until 600 nm. Even though phenyl spacers at the acceptor end rendered a bathochromic shift in the λmax, in their absence, complexes exhibited a longer electron lifetime at the TiO2 photoanode. The complexes devoid of phenyl spacers show lower charge transfer resistance at the TiO2/electrolyte interface giving improved photon conversion efficiency (PCE) in Dye‐Sensitized Solar Cells (DSSCs). Herein, we analyze the relationship between the structure and the light‐...

Research paper thumbnail of CCDC 1507776: Experimental Crystal Structure Determination

An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Research paper thumbnail of Photo controlled release of nitric oxide (NO) from amphiphilic and nanoscale vesicles based ruthenium nitrosyl complex: NO release and cytotoxicity studies

Journal of Photochemistry and Photobiology A: Chemistry, 2022

Research paper thumbnail of Terpyridine Based Heteroleptic Ruthenium Complexes: Influence of Donor and Acceptor Ligands in Photosensitization

European Journal of Inorganic Chemistry

We report heteroleptic ruthenium complexes of terpyridine (tpy) ligands with directly linked carb... more We report heteroleptic ruthenium complexes of terpyridine (tpy) ligands with directly linked carboxylic acid anchors. These complexes feature methyl or methoxy‐substituted 4′−Phtpy as donor ligands. We prepared these heteroleptic complexes from the ruthenium (II) precursor via a milder route to preclude the homoleptic complex formation. The donor−acceptor arrangement of tpy ligands in these ruthenium complexes renders visible light absorption giving metal and ligand‐to‐ligand charge transfer excitations at c.a. 490 nm. We evaluate the effect of the tpy donor substituents on the light‐harvesting ability in Dye‐Sensitized Solar Cells (DSSCs) and compare their photosensitizing ability with heteroleptic complexes bearing phenyl spacer at the acceptor end. Further, scrutinizing their photovoltaic performance, we studied their electron transfer kinetics in DSSCs using electrochemical impedance spectroscopy. This paper presents the structure‐photosensitization relationship of these heterol...

Research paper thumbnail of Heteroleptic ruthenium(ii) complexes featuring N-heterocyclic carbene-based C^N donor sets for solar energy conversion

New Journal of Chemistry

Single isomers of heteroleptic ruthenium(ii) complexes with an N-heterocyclic carbene (NHC)-based... more Single isomers of heteroleptic ruthenium(ii) complexes with an N-heterocyclic carbene (NHC)-based C^N donor-set and NCS ligands in trans configurations are isolated. One of them depicted photovoltaic efficiency of ∼50% of the standard N3 dye under similar conditions.

Research paper thumbnail of Synthesis of Rhodium(I) Complexes Bearing Bidentate NH,NR-NHC/Phosphine Ligands

Research paper thumbnail of Ruthenium (II) Complexes Bearing Heteroleptic Terpyridine Ligands: Syntheses, Photophysics and Solar Energy Conversion

European Journal of Inorganic Chemistry

Research paper thumbnail of Direct C-metallation of N-substituted triazoles promoted by mercury acetate. An alternative route to N-heterocyclic carbene complexes

RSC Adv.

One-pot synthesis of C-bound triazolate complexes of mercury(ii) from N-substituted triazoles wit... more One-pot synthesis of C-bound triazolate complexes of mercury(ii) from N-substituted triazoles with Hg(OAc)2 have been achieved. Further methylation of one of these complexes yielded a monomeric N-heterocyclic carbene complex.

Research paper thumbnail of Formation of NH,NR N-Heterocyclic Carbene Complexes through Mercuration of Mono-N-substituted Benzimidazoles

European Journal of Inorganic Chemistry, 2016

Research paper thumbnail of Platinum Complexes Bearing Normal and Mesoionic N-Heterocyclic Carbene Based Pincer Ligands: Syntheses, Structures, and Photo-Functional Attributes

Dalton Trans., 2016

Platinum complexes featuring pyridine bis-N-heterocyclic imidazol-2-ylidene/triazol-5-ylidene don... more Platinum complexes featuring pyridine bis-N-heterocyclic imidazol-2-ylidene/triazol-5-ylidene donors are prepared and screened for vapo/mechanochromic attributes.

Research paper thumbnail of Correlating the Structural and Photo­physical Features of Pincer Luminophores and Monodentate Ancillary Ligands in Pt II Phosphors

European Journal of Inorganic Chemistry, 2015

Research paper thumbnail of Photofunctional Platinum Complexes Featuring N-heterocyclic Carbene-Based Pincer Ligands

Chemistry, an Asian journal, 2015

Photoactive platinum complexes of stoichiometry [Pt((R) CCC(R) )L](0/+) (R=Me, nBu and L=CN, C≡... more Photoactive platinum complexes of stoichiometry [Pt((R) CCC(R) )L](0/+) (R=Me, nBu and L=CN, C≡CPh, N≡CCH3 , Py, CO) featuring pincer-type bis N-heterocyclic carbene (NHC) ligands ((R) CCC(R) ) were synthesized. Organometallic syntheses of these complexes are facile and achievable through standard laboratory procedures. Control of intermolecular Pt⋅⋅⋅Pt interaction, π-π stacking, and emission tuning is achieved through suitable choice of the NHC-wingtip substituent (R) and the auxiliary ligand (L). Exposure to specific volatile organic compounds (VOCs) or mechanical grinding triggers changes in emission colors, which render these complexes photofunctional. Solid-state structures and photoluminescence results are described herein.

Research paper thumbnail of Bidentate NHC^pyrozolate ligands in luminescent platinum( ii ) complexes

Dalton Trans., 2015

The tuning of luminescence from blue to yellow was achieved with platinum complexes containing NH... more The tuning of luminescence from blue to yellow was achieved with platinum complexes containing NHC^pyrozolate and functionalized-phenyl-pyridine or triazole-pyridine ligands.

Research paper thumbnail of Bis-chelate N-heterocyclic tetracarbene Ru(II) complexes: Synthesis, structure, and catalytic activity toward transfer hydrogenation of ketones

Polyhedron, 2013

ABSTRACT Abstract Ru(II) complexes with two chelating di-N-heterocyclic carbenes (NHC) and two ac... more ABSTRACT Abstract Ru(II) complexes with two chelating di-N-heterocyclic carbenes (NHC) and two acetonitrile ligands (NHC = 1,1′-dialkyl-3,3′-methylene-diimidazol-2,2′-diylidene, and alkyl = methyl and n-butyl) were synthesized and structurally characterized. The crystal structures of the complexes determined by X-ray diffraction analyses show that the Ru(II) center is bound to two bidentate carbene ligands and two acetonitrile molecules, forming a distorted octahedron. The complexes prove to be an efficient catalyst having exceedingly high turnover frequencies and good reusability in transfer hydrogenation of ketones.

Research paper thumbnail of Synthesis, Characterization, and H-Bonding Abilities of Ruthenium(II) Complexes Bearing Bidentate NR,NH-Carbene/Phosphine Ligands †

Organometallics, 2010

N-(Diphenylphosphinoalkyl) benzimidazoles react with [RuCp*(μ3-Cl)] 4 under formation of complexe... more N-(Diphenylphosphinoalkyl) benzimidazoles react with [RuCp*(μ3-Cl)] 4 under formation of complexes bearing chelating NR, NH-functionalized NHC/phosphine ligands like in [7]. The N− H group of the NHC ligands in [6] and [7] can function as a hydrogen bond donor and ...

Research paper thumbnail of Ruthenium Complexes Bearing Unsymmetric CNC′ Pincer Ligands: Molecular Structures and Electronic Properties

Research paper thumbnail of Donor functionalized ruthenium N-heterocyclic carbene complexes in alcohol oxidation reactions

Dalton Transactions, 2014

Ruthenium chelates bearing N^C^O-donors in bidentate or pincer coordination modes have been prepa... more Ruthenium chelates bearing N^C^O-donors in bidentate or pincer coordination modes have been prepared. The ruthenium pincer complex catalyses the oxidation of alcohols to the corresponding aldehydes with yields as high as 99%.