Syntheses, structures and magnetic properties of two CoII/NiII isostructural coordination polymers based on an asymmetric semirigid tricarboxylate ligand.
Acta Crystallogr C Struct Chem
; 78(Pt 1): 23-29, 2022 Jan 01.
Article
em En
| MEDLINE
| ID: mdl-34982046
ABSTRACT
Two new isostructural complexes, namely, poly[aqua[µ3-2-(4-carboxyphenoxy)terephthalato-κ3O1O4O4'](1,10-phenanthroline-κ2N,N')cobalt(II)], [Co(C15H8O7)(C12H8N2)(H2O)]n or [Co(µ3-Hcpota)(phen)(H2O)]n, I, and poly[aqua[µ3-2-(4-carboxyphenoxy)terephthalato-κ3O1O4O4'](1,10-phenanthroline-κ2N,N')nickel(II)], [Ni(C15H8O7)(C12H8N2)(H2O)]n or [Ni(µ3-Hcpota)(phen)(H2O)]n, II, have been synthesized by solvothermal reactions. Complexes I and II were fully characterized by IR spectroscopy, elemental analyses, thermogravimetric analyses, and powder and single-crystal X-ray diffraction. They both present two-dimensional structures based on [M2(µ-COO)2]2+ (M = CoII or NiII) dinuclear metal units with a fes topology and a vertex symbol (4·82). Interestingly, the positions of the two dimeric metal motifs and the two partially deprotonated Hcpota2- ligands reproduce regular flying butterfly arrangements flipped upside down and sharing wings in the ab plane. Magnetic studies indicate antiferromagnetic interactions (J = -5.21â
cm-1 for I and -11.53â
cm-1 for II) in the dimeric units, with Co...Co and Ni...Ni distances of 4.397â
(1) and 4.358â
(1)â
Å, respectively, that are related to double syn-anti carboxylate bridges.
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01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
Acta Crystallogr C Struct Chem
Ano de publicação:
2022
Tipo de documento:
Article