Coordination properties of a polyamine cryptand with two different binding moieties. A case of a pH-modulated antenna device based on a new Eu(III) cryptate complex

被引：16

作者：

Bazzicalupi, C

Bencini, A

Berni, E

Bianchi, A

Giorgi, C

Fusi, V

Valtancoli, B

Lodeiro, C

Roque, A

Pina, F

机构：

[1] Univ Florence, Dept Chem, I-50144 Florence, Italy

[2] Univ Urbino, Inst Chem Sci, I-61029 Urbino, Italy

[3] Univ Nova Lisboa, Fac Ciencias & Tecnol, Ctr Quim Fina & Biotecnol, Dept Quim, P-2825 Monte De Caparica, Portugal

来源：

INORGANIC CHEMISTRY | 2001年 / 40卷 / 24期

关键词：

D O I：

10.1021/ic010638r

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Protonation and alkali- and alkaline-earth-metal coordination by the dipyridine-containing cryptand L have been studied by means of potentiometric and spectroscopic (UV-vis, H-1 NMR) measurements in aqueous solutions. This ligand is constituted by an aliphatic polyamine chain and a coordinating cleft, delimited by two dipyridine units, where the metal ion is lodged. The resulting complexes are characterized by an unusually high stability. The polyamine chain is not involved, or weakly involved, in metal coordination, and facile protonation can occur on the nitrogen atoms of this moiety. Similar coordination features are found in the Eu(IH) complex. A fluorescence emission study reveals that the Eu(IH) cryptate shows the characteristic visible emission of the metal, due to the intramolecular energy transfer to the metal ion mainly from the lower energy triplet state of the cryptand. On the other hand, the emission intensity is modulated by pH, giving a maximum at neutral pH and decreasing at both acidic and alkaline pH values.

引用

页码：6172 / 6179

页数：8

共 46 条

[1] ENERGY-TRANSFER LUMINESCENCE OF EUROPIUM(III) AND TERBIUM(III) CRYPTATES OF MACROBICYCLIC POLYPYRIDINE LIGANDS [J].