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Identifier

000466071

Title

Σύνθεση, χαρακτηρισμός και μαγνητικές ιδιότητες πολυπυρηνικών συμπλόκων του Κοβαλτίου με υποκαταστάτες σαλικυλικής άλδευσης και αναλόγων της

Alternative Title

Synthesis, characterisation and magnetic properties of polynuclear Cobalt complexes with salicylaldehyde and its analogues as ligands

Author

Τσάμη, Πηνελόπη Α.

Thesis advisor

Μήλιος, Κωνσταντίνος

Reviewer

Δημάδης, Κωνσταντίνος
Κουλουμπής, Αντώνιος

Abstract

In this work we investigated the triad synthetic reaction system Co^II/RCOO^-/aldehydes (RCOO^-: OAc^- or piv^-, aldehydes= salicylaldehyde-type aldehydes, salH, FsalH, ClsalH, BrsalH και naphthH) as a means of constructing polynuclear cobalt complexes. We were able to isolate a family of four pseudo-calixarene {Co16} ring-like complexes [Co₁₆(sal)₁₆(OAc)₁₆]•16MeCN (2•16MeCN), [Co₁₆(Fsal)₁₆(OAc)₁₆]•xMeCN (4•xMeCN), [Co₁₆(Clsal)₁₆(OAc)₁₆]•8MeCN (6•8MeCN) and [Co₁₆(Brsal)₁₆(OAc)₁₆]•2MeCN•2H₂O (8•2MeCN•2H₂O), a dinuclear complex, [Co₂(Brsal)₄(OAc)]H₂NEt₂•3MeCN (7•3MeCN), a tetranuclear defective dicubane, [Co₄(Brsal)₆(piv)₂]•2Et2O (9•2Et₂O), and finally, a family of three 1D coordination polymers, [{Co₃(sal)₂(piv)₂(H₂O)₂}•2PropCN]_n (10), [{Co₃(Brsal)₂(piv)₄(H₂O)₂}•2PropCN]_n (11) and [Co₃(naphth)₂(piv)₄]_n (12). In each case, upon using different aldehyde ligands, we were able to isolate analogous clusters with different structural features. The magnetic behaviour of 2, 6, 8 and 9 was studied, and in the case of 2, 6, and 8 dominant ferromagnetic interactions were found, while complex 9 displays dominant antiferromagnetic interactions.

Language

Greek

Subject

Cobalt-(II) complexes

Crystal structure

Magnetic properties

O-donors

X-ray crystallography

Κρυσταλλική δομή

Κρυσταλλογραφία Ακτίνων Χ

Μαγνητικές ιδιότητες

Ο-δότες