Synthesis and characterization of new lanthanide complexes with hexadentate hydrazonic ligands |
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| Authors: | M Carcelli P Pelagatti D Rogolino C Solinas |
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| Institution: | a Dipartimento di Chimica Generale ed Inorganica, Chimica Analitica, Chimica Fisica, Università degli Studi di Parma, Parco Area delle Scienze, 17/A-43100 Parma, Italy
b Dipartimento di Scienze del Farmaco, Università di Sassari, Via Muroni 23/A-07100 Sassari, Italy |
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| Abstract: | In this paper, we report the synthesis and the characterization of a novel series of lanthanide (III) complexes with two potentially hexadentate ligands.The ligands contain a rigid phenanthroline moiety and two flexible hydrazonic arms with different donor atom sets (NNN′N′OO and NNN′N′N″N″, respectively for H2L1 (2,9-diformylphenanthroline)bis(benzoyl)hydrazone and H2L2 (2,9-diformylphenanthroline)bis(2-pyridyl)hydrazone).Both nitrate and acetate complexes of H2L1 with La, Eu, Gd, and Tb were prepared and fully characterized, and the X-ray crystal structure of the complex Eu(HL1)(CH3 COO)2] · 5H2O is presented.The stability constants of the equilibria Ln3+ + H2L1 = Ln(H2L1)]3+ and Ln3+ + (L1)2− = Ln(L1)]+ (Ln = La(III), Eu(III), Gd(III), and Tb(III)) are determined by UV spectrophotometric titrations in DMSO at t = 25 °C. The nitrate complexes of H2L2 with La, Eu, Gd and Tb were also synthesized, and the X-ray crystal structures of La(H2L2)(NO3)2(H2O)](NO3), Eu(H2L2)(NO3)2](NO3) and Tb(H2 L2)(NO3)2](NO3) are discussed. |
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| Keywords: | Lanthanide ions Hydrazones Hexadentate ligands crystal structure Phenantroline derivatives |
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