Andrea Danesi

Veneto Institute of Molecular Medicine

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Barbara Valtancoli

University of Florence

Andrea Bencini

University of Florence

Claudia Giorgi

University of Florence

Carla Bazzicalupi

University of Florence

Antonio Bianchi

University of Florence

Fernando Piña

Universidade Nova de Lisboa

Samuele Santarelli

Eni (Italy)

A. Bianchi

Université de Montréal

L. Borsari

University of Florence

Carlos Lodeiro

Rede de Química e Tecnologia

Cooperative Institutions

University of Florence

University of Padua

University of Cagliari

University of Southampton

Centre National de la Recherche Scientifique

Universitat de València

Istituto Nazionale di Fisica Nucleare, Sezione di Cagliari

Universidade Nova de Lisboa

Veneto Institute of Molecular Medicine

Rede de Química e Tecnologia

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Coordination features of a terpyridine-containing polyamine receptor. Effect of protonation on the photophysical properties of the complexes

Dalton Transactions (2006)

Carla Bazzicalupi Andrea Bencini Antonio Bianchi L. Borsari Andrea Danesi

The synthesis of the new terpyridine-containing macrocycle 2,6,10,14-tetraaza[15](6,6'')cyclo(2,2':6',2'')terpyridinophane (L) is reported. The ligand contains a tetraamine chain linking the 6,6'' positions of a terpyridine unit. A potentiometric, (1)H NMR, UV-vis spectrophotometric and fluorescence emission study on the basicity properties of in aqueous solutions shows that the first four protonation steps occur on the polyamine chain, while the terpyridine nitrogens are involved in proton binding only in the last protonation step at strongly acidic pH values. Cu(II), Zn(II), Cd(II) and Pb(II) complexation was studied in aqueous solution by means of potentiometric, spectrophotometric and spectrofluorimetric measurements. Cu(II) and Zn(II) can form both mono- and dinuclear complexes in solution, while the larger Cd(II) and Pb(II) give only mononuclear complexes. In the [ML](2+) complexes (M = Zn(II) or Cd(II)) the metal is unequivocally bound to the terpyridine unit. Some amine groups are not coordinated and can quench the fluorescence emission of the terpyridine unit thanks to an electron transfer process. Protonation of the unbound amine groups inhibits the eT process, affording fluorescent [MLH(x)]((2+x)+) complexes.

Terpyridine

10.1039/b609462g

Cite

Citations (15)

CCDC 613191: Experimental Crystal Structure Determination

The Cambridge Structural Database (2007)

Carla Bazzicalupi Andrea Bencini A. Bianchi L. Borsari Andrea Danesi

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.

10.5517/ccnl2cn

Cite

Citations (0)

Zn(II) Coordination by Open-chain Polyamine Ligands Containing Dipyridine Units. Highly Active Dinuclear Zn(II) Complexes in Phosphate Ester Hydrolysis

The Open Inorganic Chemistry Journal (2008)

Carla Bazzicalupi Andrea Bencini Andrea Danesi Enrico Faggi Claudia Giorgi

The synthesis and characterization of two new open-chain ligands, L1 and L2, containing two 2,2'-dipyridine units connected respectively by a pentaethylenhexamine and a pentapropylenhexamine chain, is reported.Zn(II) complexation has been studied by means of potentiometric and UV-vis spectrophotometric measurements in aqueous solution.Both ligands form stable mono-and dinuclear complexes, the metal ions being coordinated by a single dipyridine unit and by the adjacent amine groups.The ability of the binuclear Zn(II) complexes as nucleophilic agents in hydrolytic processes has been tested by using bis(p-nitrophenyl) phosphate (BNPP) as substrate.Both complexes display high rate enhancements in BNPP cleavage in aqueous solution.The study outlines that different mechanisms are operative in BNPP cleavage in the presence of the L1 and L2 complexes.

Polyamine

Phosphonate

10.2174/1874098700802010080

Cite

Citations (1)

New Terpyridine-Containing Macrocycle for the Assembly of Dimeric Zn(II) and Cu(II) Complexes Coupled by Bridging Hydroxide Anions and π-Stacking Interactions

Inorganic Chemistry (2004)

Carla Bazzicalupi Andrea Bencini E. Berni Antonio Bianchi Andrea Danesi

The synthesis of the new terpyridine-containing macrocycle 2,5,8,11,14-pentaaza[15](6,6' ')cyclo(2,2':6',2' ')terpyridinophane (L) is reported. The ligand contains a pentaamine chain linking the 6,6' ' positions of a terpyridine unit. A potentiometric, (1)H NMR, UV-vis spectrophotometric and fluorescence emission study on the acid-base properties of L in aqueous solutions shows that the first four protonation steps occur on the polyamine chain, whereas the terpyridine nitrogens are involved in proton binding only at strongly acidic pH values. L can form both mono- and dinuclear Cu(II), Zn(II), Cd(II), and Pb(II) complexes in aqueous solution. The crystal structures of the Zn(II) and Cd(II) complexes ([ZnLH](2)(micro-OH))(ClO(4))(5) (6) and ([CdLH](2)(micro-Br))(ClO(4))(5).4H(2)O (7) show that two mononuclear [MLH](3+) units are coupled by a bridging anion (OH(-) in 6 and Br(-) in 7) and pi-stacking interactions between the terpyridine moieties. A potentiometric and spectrophotometric study shows that in the case of Cu(II) and Zn(II) the dimeric assemblies are also formed in aqueous solution containing the ligand and the metals in a 1:1 molar ratio. Protonation of the complexes or the addition of a second metal ion leads to the disruption of the dimers due to the increased electrostatic repulsions between the two monomeric units.

Terpyridine

10.1021/ic049660l

Cite

Citations (34)

ChemInform Abstract: New Perspectives in Oxazole Chemistry. Part 3. Homo- and Heterodomino Processes of 4-Nitro Derivatives.

ChemInform (2000)

Rodolfo Nesi Stefania Turchi Donatella Giomi Andrea Danesi

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Oxazole

10.1002/chin.200011115

Cite

Citations (0)

New metal complexes containing a proflavine pendant arm as bifunctional DNA binding agent

Carla Bazzicalupi Andrea Bencini Antonio Bianchi Tarita Biver Alessia Boggioni

Proflavine

Source

Cite

Citations (0)

CCDC 158298: Experimental Crystal Structure Determination

The Cambridge Structural Database (2001)