Roberto Purrello | Università di Catania (original) (raw)

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Papers by Roberto Purrello

Research paper thumbnail of Spectroscopic and self-association behavior of a porphyrin-β-cyclodextrin conjugate

New J. Chem., Jan 1, 2007

... Antonino Puglisi, Roberto Purrello, Enrico Rizzarelli, Salvatore Sortino* and Graziella Vecch... more ... Antonino Puglisi, Roberto Purrello, Enrico Rizzarelli, Salvatore Sortino* and Graziella Vecchio*. Dipartimento di Scienze Chimiche, Università di Catania ... and G. Vecchio, Polyhedron, 2002, 21, 1531 Article ChemPort ; (c) V. Cucinotta, A. Giuffrida, D. La Mendola, G. Maccarrone, A ...

Research paper thumbnail of Comparison of three fungal laccases from Rigidoporus lignosus and Pleurotus ostreatus: correlation between conformation changes and catalytic activity

Journal of Inorganic Biochemistry, 2001

Research paper thumbnail of Re-examination of the formation of dinitrosyl–iron complexes during reaction of S-nitrosothiols with Fe(II)

Inorganica Chimica Acta, 2001

The reaction of S-nitrosothiol compounds with ferrous ions in solution has been investigated and ... more The reaction of S-nitrosothiol compounds with ferrous ions in solution has been investigated and the generated dinitrosyl-iron complexes have been characterized. During the reaction of S-nitrosocysteamine with Fe(II) in water solution in the presence of a twofold excess (with respect to iron) of cysteamine hydrochloride (CSH), an EPR-silent dinuclear iron complex (complex A of formula [Fe 2 (RS) 2 (NO) 4 ]) was formed as the major species and was characterized by FAB MS + , UV-Vis, NMR and IR spectroscopies. In the presence of a large excess of CSH (CSH/Fe(II)=20:1), a green paramagnetic mononuclear complex (complex B of formula [Fe(RS) 2 (NO) 2 ] − ) was formed. From EPR and UV-Vis data, and also on the basis of the few crystallographic structures known for similar complexes, complex B is proposed to display a distorted tetrahedral geometry (C 26 ), approaching a trigonal bipyramid with a missing ligand, with the unpaired electron mainly localized on the d z 2 orbital of the iron characterized by a d 9 electronic configuration.

Research paper thumbnail of Nanoporous Crystals of Calixarene/Porphyrin Supramolecular Complex Functionalized by Diffusion and Coordination of Metal Ions

Journal of the American Chemical Society, Mar 1, 2009

A highly nanoporous material has been obtained by self-assembly of calixarene and porphyrin build... more A highly nanoporous material has been obtained by self-assembly of calixarene and porphyrin building blocks. This supramolecular zeolite-like structure was successively functionalized by diffusion and coordination of metal ions to form a new bifunctionalized nanoporous material containing a porphyrinic pigment together with a metal center.

Research paper thumbnail of Transfer, Memory and Amplification of Chirality in Porphyrin Aggregates

Http Dx Doi Org 10 1080 10610270412331328934, Aug 19, 2006

Research paper thumbnail of Design and crystallographic characterization of multi-porphyrins complexes

Research paper thumbnail of Supramolecular Aggregation/Deaggregation in Amphiphilic Dipolar Schiff-Base Zinc(II) Complexes

Inorganic Chemistry, Jun 1, 2010

The synthesis, characterization, optical, and fluorescent properties of an amphiphilic Schiff-bas... more The synthesis, characterization, optical, and fluorescent properties of an amphiphilic Schiff-base bis(salicylaldiminato)zinc(II) complex are reported. Detailed 1 H nuclear magnetic resonance (NMR), diffusion-ordered spectroscopy (DOSY) NMR, optical absorption, and fluorescence spectroscopy studies indicate the existence of aggregate species in noncoordinating solvents. The degree and type of aggregation are related to the concentration and the polarity of the noncoordinating solvent. Dilute solutions are likely characterized by the presence of defined dimers, whereas larger oligomeric aggregates are conceivably formed at higher concentrations. The concentration needed to observe the formation of larger species depends upon solvent polarity. In coordinating solvents or in the presence of coordinating species, a complete deaggregation of the system occurs, because of the axial coordination to the Zn II ion, accompanied by considerable changes of 1 H NMR and optical absorption spectra. A dramatic enhancement of fluorescence emission is observed in dichloromethane solutions upon deaggregation with a coordinating agent. The formation of a defined 2:1 supramolecular structure is demonstrated in the case of a ditopic ligand as coordinating species. Overall, these complexes are promising systems for the development of new supramolecular architectures and supramolecular fluorescent probes.

Research paper thumbnail of Thermodynamic and multinuclear magnetic resonance study of dimethyltin(IV) complexes with tridentate ligands in aqueous solution

Journal of the Chemical Society, Dalton Transactions, 1992

Research paper thumbnail of Non-covalent interactions in thermodynamic stereoselectivity of mixed-ligand copper(II)-D- or L-histidine complexes with L-amino acids. A possible model of metal ion-assisted molecular recognition

Journal of the Chemical Society, Dalton Transactions, 1990

ABSTRACT

Research paper thumbnail of Co-ordination properties of dialkyltin(IV) in aqueous solution. Thermodynamics of complex formation with carboxylic acids

Journal of the Chemical Society, Dalton Transactions, 1990

Research paper thumbnail of Hierarchical Effect behind the Supramolecular Chirality of Silver(I)-Cysteine Coordination Polymers

The journal of physical chemistry. B, Jan 31, 2015

Cysteine is a sulfur-containing amino acid that easily coordinates to soft metal ions and grafts ... more Cysteine is a sulfur-containing amino acid that easily coordinates to soft metal ions and grafts to noble metal surfaces. Recently, chiroptical activity of Ag(+)/cysteine coordination polymers has been widely studied, while, on the other hand, the appearance of a plasmon-enhanced circular dichroic signal (PECD) at the plasmonic spectral region (λ > 400 nm) has been observed for AgNPs capped with chiral sulfur-containing amino acids. These two events are both potentially exploited for sensing applications. However, the presence of Ag(+) ions in AgNP colloidal solution deals with the competition of cysteine grafting at the metal NP surface and/or metal ion coordination. Herein we demonstrate that the chiroptical activity observed by adding cysteine to AgNP colloids prepared by pulsed laser ablation in liquids (PLAL) is mainly related to the formation of CD-active Ag(+)/cysteine supramolecular polymers. The strict correlation between supramolecular chirality and hierarchical effects...

Research paper thumbnail of Thermodynamic study of dimethyltin(IV) complexes with nucleoside 5?-triphosphates

Journal of the Chemical Society, Dalton Transactions, 1992

Thermodynamic Study of Dimethyltin(1v) Complexes with Nucleoside 5'-Triphosp... more Thermodynamic Study of Dimethyltin(1v) Complexes with Nucleoside 5'-Triphosphates * ... Giuseppe Arena/ Rosario Cali,” Annalinda Contino,a Nunzia Loretta.b Salvatore Musumecia and Roberto Purrellob a Oipartimento di Scienze Chimiche, Universita di Catania, V. le A. Doria 6, ...

Research paper thumbnail of Formation and stability constants of dimethyltin(IV) complexes with citrate, tripolyphosphate, and nitrilotriacetate in aqueous solution

Journal of the Chemical Society, Dalton Transactions, 1990

The complex formation of [SnMe 2] 2+ with citrate, tripolyphosphate, and nitrilotriacetate has be... more The complex formation of [SnMe 2] 2+ with citrate, tripolyphosphate, and nitrilotriacetate has been investigated potentiometrically at 25 C and I= 0.1 mol dm–3 (KNO 3); the protonation constants for all three ligands have also been determined under the same experimental ...

Research paper thumbnail of www. rsc. org/chemcomm Volume 48| Number 34| 28 April 2012| Pages 4021–4128

Research paper thumbnail of Kinetic investigation of supramolecular assembling on poly (L-glutamic acid)

Research paper thumbnail of ARTICLES-PHYSICAL CHEMISTRY OF MATERIALS: FROM NANOPARTICLES TO MACROMOLECULES-Mesoscopic Structure of meso-Tetrakis (4-sulfonatophenyl) porphine J-Aggregates

Research paper thumbnail of SYMPOSIUM LECTURES-Application of neutral and cationic tetraarylporphyrins and metalloporphyrins as versatile circular dichroic reporter groups

Research paper thumbnail of CHED 1522-Molecular and supramolecular chirality: From local to long-range dissymmetry

Research paper thumbnail of (Invited) Chirality Transfer for Sensing, Memory and Separation

Research paper thumbnail of Formation and Stability of Simple and Mixed Complexes of Glycyl-L-Histidine in Aqueous-Solution

Research paper thumbnail of Spectroscopic and self-association behavior of a porphyrin-β-cyclodextrin conjugate

New J. Chem., Jan 1, 2007

... Antonino Puglisi, Roberto Purrello, Enrico Rizzarelli, Salvatore Sortino* and Graziella Vecch... more ... Antonino Puglisi, Roberto Purrello, Enrico Rizzarelli, Salvatore Sortino* and Graziella Vecchio*. Dipartimento di Scienze Chimiche, Università di Catania ... and G. Vecchio, Polyhedron, 2002, 21, 1531 Article ChemPort ; (c) V. Cucinotta, A. Giuffrida, D. La Mendola, G. Maccarrone, A ...

Research paper thumbnail of Comparison of three fungal laccases from Rigidoporus lignosus and Pleurotus ostreatus: correlation between conformation changes and catalytic activity

Journal of Inorganic Biochemistry, 2001

Research paper thumbnail of Re-examination of the formation of dinitrosyl–iron complexes during reaction of S-nitrosothiols with Fe(II)

Inorganica Chimica Acta, 2001

The reaction of S-nitrosothiol compounds with ferrous ions in solution has been investigated and ... more The reaction of S-nitrosothiol compounds with ferrous ions in solution has been investigated and the generated dinitrosyl-iron complexes have been characterized. During the reaction of S-nitrosocysteamine with Fe(II) in water solution in the presence of a twofold excess (with respect to iron) of cysteamine hydrochloride (CSH), an EPR-silent dinuclear iron complex (complex A of formula [Fe 2 (RS) 2 (NO) 4 ]) was formed as the major species and was characterized by FAB MS + , UV-Vis, NMR and IR spectroscopies. In the presence of a large excess of CSH (CSH/Fe(II)=20:1), a green paramagnetic mononuclear complex (complex B of formula [Fe(RS) 2 (NO) 2 ] − ) was formed. From EPR and UV-Vis data, and also on the basis of the few crystallographic structures known for similar complexes, complex B is proposed to display a distorted tetrahedral geometry (C 26 ), approaching a trigonal bipyramid with a missing ligand, with the unpaired electron mainly localized on the d z 2 orbital of the iron characterized by a d 9 electronic configuration.

Research paper thumbnail of Nanoporous Crystals of Calixarene/Porphyrin Supramolecular Complex Functionalized by Diffusion and Coordination of Metal Ions

Journal of the American Chemical Society, Mar 1, 2009

A highly nanoporous material has been obtained by self-assembly of calixarene and porphyrin build... more A highly nanoporous material has been obtained by self-assembly of calixarene and porphyrin building blocks. This supramolecular zeolite-like structure was successively functionalized by diffusion and coordination of metal ions to form a new bifunctionalized nanoporous material containing a porphyrinic pigment together with a metal center.

Research paper thumbnail of Transfer, Memory and Amplification of Chirality in Porphyrin Aggregates

Http Dx Doi Org 10 1080 10610270412331328934, Aug 19, 2006

Research paper thumbnail of Design and crystallographic characterization of multi-porphyrins complexes

Research paper thumbnail of Supramolecular Aggregation/Deaggregation in Amphiphilic Dipolar Schiff-Base Zinc(II) Complexes

Inorganic Chemistry, Jun 1, 2010

The synthesis, characterization, optical, and fluorescent properties of an amphiphilic Schiff-bas... more The synthesis, characterization, optical, and fluorescent properties of an amphiphilic Schiff-base bis(salicylaldiminato)zinc(II) complex are reported. Detailed 1 H nuclear magnetic resonance (NMR), diffusion-ordered spectroscopy (DOSY) NMR, optical absorption, and fluorescence spectroscopy studies indicate the existence of aggregate species in noncoordinating solvents. The degree and type of aggregation are related to the concentration and the polarity of the noncoordinating solvent. Dilute solutions are likely characterized by the presence of defined dimers, whereas larger oligomeric aggregates are conceivably formed at higher concentrations. The concentration needed to observe the formation of larger species depends upon solvent polarity. In coordinating solvents or in the presence of coordinating species, a complete deaggregation of the system occurs, because of the axial coordination to the Zn II ion, accompanied by considerable changes of 1 H NMR and optical absorption spectra. A dramatic enhancement of fluorescence emission is observed in dichloromethane solutions upon deaggregation with a coordinating agent. The formation of a defined 2:1 supramolecular structure is demonstrated in the case of a ditopic ligand as coordinating species. Overall, these complexes are promising systems for the development of new supramolecular architectures and supramolecular fluorescent probes.

Research paper thumbnail of Thermodynamic and multinuclear magnetic resonance study of dimethyltin(IV) complexes with tridentate ligands in aqueous solution

Journal of the Chemical Society, Dalton Transactions, 1992

Research paper thumbnail of Non-covalent interactions in thermodynamic stereoselectivity of mixed-ligand copper(II)-D- or L-histidine complexes with L-amino acids. A possible model of metal ion-assisted molecular recognition

Journal of the Chemical Society, Dalton Transactions, 1990

ABSTRACT

Research paper thumbnail of Co-ordination properties of dialkyltin(IV) in aqueous solution. Thermodynamics of complex formation with carboxylic acids

Journal of the Chemical Society, Dalton Transactions, 1990

Research paper thumbnail of Hierarchical Effect behind the Supramolecular Chirality of Silver(I)-Cysteine Coordination Polymers

The journal of physical chemistry. B, Jan 31, 2015

Cysteine is a sulfur-containing amino acid that easily coordinates to soft metal ions and grafts ... more Cysteine is a sulfur-containing amino acid that easily coordinates to soft metal ions and grafts to noble metal surfaces. Recently, chiroptical activity of Ag(+)/cysteine coordination polymers has been widely studied, while, on the other hand, the appearance of a plasmon-enhanced circular dichroic signal (PECD) at the plasmonic spectral region (λ > 400 nm) has been observed for AgNPs capped with chiral sulfur-containing amino acids. These two events are both potentially exploited for sensing applications. However, the presence of Ag(+) ions in AgNP colloidal solution deals with the competition of cysteine grafting at the metal NP surface and/or metal ion coordination. Herein we demonstrate that the chiroptical activity observed by adding cysteine to AgNP colloids prepared by pulsed laser ablation in liquids (PLAL) is mainly related to the formation of CD-active Ag(+)/cysteine supramolecular polymers. The strict correlation between supramolecular chirality and hierarchical effects...

Research paper thumbnail of Thermodynamic study of dimethyltin(IV) complexes with nucleoside 5?-triphosphates

Journal of the Chemical Society, Dalton Transactions, 1992

Thermodynamic Study of Dimethyltin(1v) Complexes with Nucleoside 5'-Triphosp... more Thermodynamic Study of Dimethyltin(1v) Complexes with Nucleoside 5'-Triphosphates * ... Giuseppe Arena/ Rosario Cali,” Annalinda Contino,a Nunzia Loretta.b Salvatore Musumecia and Roberto Purrellob a Oipartimento di Scienze Chimiche, Universita di Catania, V. le A. Doria 6, ...

Research paper thumbnail of Formation and stability constants of dimethyltin(IV) complexes with citrate, tripolyphosphate, and nitrilotriacetate in aqueous solution

Journal of the Chemical Society, Dalton Transactions, 1990

The complex formation of [SnMe 2] 2+ with citrate, tripolyphosphate, and nitrilotriacetate has be... more The complex formation of [SnMe 2] 2+ with citrate, tripolyphosphate, and nitrilotriacetate has been investigated potentiometrically at 25 C and I= 0.1 mol dm–3 (KNO 3); the protonation constants for all three ligands have also been determined under the same experimental ...

Research paper thumbnail of www. rsc. org/chemcomm Volume 48| Number 34| 28 April 2012| Pages 4021–4128

Research paper thumbnail of Kinetic investigation of supramolecular assembling on poly (L-glutamic acid)

Research paper thumbnail of ARTICLES-PHYSICAL CHEMISTRY OF MATERIALS: FROM NANOPARTICLES TO MACROMOLECULES-Mesoscopic Structure of meso-Tetrakis (4-sulfonatophenyl) porphine J-Aggregates

Research paper thumbnail of SYMPOSIUM LECTURES-Application of neutral and cationic tetraarylporphyrins and metalloporphyrins as versatile circular dichroic reporter groups

Research paper thumbnail of CHED 1522-Molecular and supramolecular chirality: From local to long-range dissymmetry

Research paper thumbnail of (Invited) Chirality Transfer for Sensing, Memory and Separation

Research paper thumbnail of Formation and Stability of Simple and Mixed Complexes of Glycyl-L-Histidine in Aqueous-Solution