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From Salicylaldehyde to Chiral Salen Sulfonates – Syntheses, Structures and

Coordination complexes derived from chiral and nonchiral sulfonato salen ligands {(SalenSO3)Na2: N,N-bis(5-sulfonatosalicylidene)- 1,2-diaminoethane disodium salt, [(R,R) and (S,S)-CySalenSO3]NaK: (R,R) and (S,S)-N,N-bis(5-sulfonatosalicylidene)- 1,2-diaminocyclohexane sodium–potassium salt} have been synthesized. The crystal structures of the chiral and nonchiral NiII complexes [Ni(SalenSO3)]Na2 (1) and [Ni((R,R)CySalenSO3)]NaK (2) were solved. The other chiral and nonchiral sulfonato salen complexes, [Cu(SalenSO3)]Na2 (4), [Cu((R,R)CySalenSO3)]NaK (5), [Cu((S,S)CySalen- SO3)]NaK (6) and [Zn(SalenSO3)]Na2 (7) got hydrolyzed before suitable crystals could form. Yet, their hydrolysis led to the formation of single crystals of the residues of total or partial hydrolysis: 5-sulfonatosalicylaldehyde sodium salt (A), N- (5-sulfonatosalicylidene)-1,2-diaminoethane copper(II) [Cu- (SalSO3)] (8) and (R,R)-N-(5-sulfonatosalicylidene)-1,2-diaminocyclohexane copper(II) {Cu[(R,R)CySalSO3]} (9). All compounds were studied with IR and UV/Vis spectroscopy; chiral compounds were also investigated by circular dichroism. The magnetic properties of the copper compounds were investigated. Whereas 8 shows intermolecular antiferromagnetic interactions between mononuclear CuII complexes, 7 presents a weak intramolecular ferromagnetic coupling (J = 0.66 cm–1, H = –JSˆ Cu1Sˆ Cu2), which has been rationalized by DFT calculations.

Auteur(s) : Émilie Delahaye,[a] Mayoro Diop,[a] Richard Welter,[b] Mauro Boero,[a,c] Carlo Massobrio,[a]
Pages : 4450–4461
Année de publication : 2010,
Revue : Eur. J. Inorg. Chem.
Type : Article
Mise en ligne par : DIOP Mayoro