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Synthesis and Relaxometric Properties of Gadolinium(III) Complexes of New Triazine-Based Polydentate Ligands

✍ Scribed by Lorenzo Tei; Marina Benzi; Filip Kielar; Mauro Botta; Camilla Cavallotti; Giovanni Battista Giovenzana; Silvio Aime

Publisher
John Wiley and Sons
Year
2009
Tongue
German
Weight
288 KB
Volume
92
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

Two new derivatives based on an s‐triazine structural motif were synthesized by attaching two 2,2′‐hydrazinylidenebis[acetic acid] moieties to the triazine ring to reach an overall heptadenticity for the complexation of lanthanide(III) cations. The remaining reactive site was exploited for the substitution with a functionizable amino group (see H~4~L1) and a lipophilic moiety (see H~4~L2). Luminescence‐lifetime determinations revealed the presence of a single H~2~O molecule coordinated for [Eu(L1)]. A complete ^1^H‐NMR relaxometric study was carried out for the octacoordinated [Gd(L1)] and [Gd(L2)] complexes. A remarkably long H~2~O residence lifetime (^298^τ~M~=5.2 μs) was found by ^17^O‐NMR in the case of [Gd(L1)]. Micelle formation of the lipophilic complex [Gd(L2)] was evidenced, the critical micellization concentration (cmc) determined, and relaxometric properties of the system investigated.

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