Two novel tetranuclear closed-cubane like core framework complexes [Cu4(L1)4]⋅3(H2O) (1) and [Cu4(H2L2)4(H2O)4] (2) (H2L1=(E)-2-((1-hydroxybutan-2-ylimino)methyl)phenol; H4L2=2-((2-hydroxy-3-methoxybenzylidene)amino)-2-hydroxymethylpropane-1,3-diol) were synthesized and structurally characterized. Magnetic susceptibility measurements indicate an overall weak antiferromagnetic exchange coupling in 1, while ferromagnetic exchange coupling in 2. In agreement with their closed-cubane structure, the magnetic behavior of the two complexes have been studied by employing the isotropic spin Hamiltonian of type H=J1 (S1S3 + S1S4 + S2S3 + S2S4) - J2 (S1S2 + S3S4) (J1 describes the magnetic exchange coupling between the four Cu(II) pairs with short Cu⋅⋅⋅Cu distances, while J2 characterizes the magnetic exchange coupling between the remaining two intermetallic pairs with long distances). The PHI program was used to study their magnetic behavior. A good agreement between the experimental and fitted curves was found with the following parameters: g=2.14, J1=-20.3 cm−1 and J2=0 cm−1 for 1 and g=2.10, J1=101.1 cm−1 and J2=-51.5 cm−1 for 2.

Structural and Magnetic Characterization of Two Tetranuclear Cu(II) Complexes with Closed-Cubane-Like Core Framework

ZANGRANDO, ENNIO;
2017-01-01

Abstract

Two novel tetranuclear closed-cubane like core framework complexes [Cu4(L1)4]⋅3(H2O) (1) and [Cu4(H2L2)4(H2O)4] (2) (H2L1=(E)-2-((1-hydroxybutan-2-ylimino)methyl)phenol; H4L2=2-((2-hydroxy-3-methoxybenzylidene)amino)-2-hydroxymethylpropane-1,3-diol) were synthesized and structurally characterized. Magnetic susceptibility measurements indicate an overall weak antiferromagnetic exchange coupling in 1, while ferromagnetic exchange coupling in 2. In agreement with their closed-cubane structure, the magnetic behavior of the two complexes have been studied by employing the isotropic spin Hamiltonian of type H=J1 (S1S3 + S1S4 + S2S3 + S2S4) - J2 (S1S2 + S3S4) (J1 describes the magnetic exchange coupling between the four Cu(II) pairs with short Cu⋅⋅⋅Cu distances, while J2 characterizes the magnetic exchange coupling between the remaining two intermetallic pairs with long distances). The PHI program was used to study their magnetic behavior. A good agreement between the experimental and fitted curves was found with the following parameters: g=2.14, J1=-20.3 cm−1 and J2=0 cm−1 for 1 and g=2.10, J1=101.1 cm−1 and J2=-51.5 cm−1 for 2.
2017
Pubblicato
http://onlinelibrary.wiley.com/doi/10.1002/slct.201700669/abstract
File in questo prodotto:
File Dimensione Formato  
Manna_et_al-2017-ChemistrySelect.pdf

Accesso chiuso

Tipologia: Documento in Versione Editoriale
Licenza: Digital Rights Management non definito
Dimensione 2.93 MB
Formato Adobe PDF
2.93 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
slct201700669-sup-0001-misc_information.pdf

Accesso chiuso

Descrizione: Supporting information
Tipologia: Altro materiale allegato
Licenza: Digital Rights Management non definito
Dimensione 795.69 kB
Formato Adobe PDF
795.69 kB Adobe PDF   Visualizza/Apri   Richiedi una copia
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2901745
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 14
  • ???jsp.display-item.citation.isi??? ND
social impact