Syntheses, crystal structures and magnetic properties of five new manganese(ii) complexes: influence of the conformation of different alkyl/aryl substituted malonate ligands on the crystal packing

CrystEngComm ◽  
2014 ◽  
Vol 16 (13) ◽  
pp. 2766 ◽  
Author(s):  
Mariadel Déniz ◽  
Irene Hernández-Rodríguez ◽  
Jorge Pasán ◽  
Oscar Fabelo ◽  
Laura Cañadillas-Delgado ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Crystal Structures ◽  
Crystal Packing ◽  
Alkyl Aryl

scholarly journals Bis(triphenylphosphine)iminium Salts of Dioxothiadiazole Radical Anions: Preparation, Crystal Structures, and Magnetic Properties

Crystals ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 30 ◽  
Author(s):  
Paweł Pakulski ◽  
Mirosław Arczyński ◽  
Dawid Pinkowicz
Keyword(s):  
Magnetic Properties ◽  
Crystal Structures ◽  
Magnetic Materials ◽  
Exchange Coupling ◽  
Crystal Packing ◽  
Stable Radical ◽  
Radical Anions ◽  
Iminium Salts ◽  
Redox Active ◽  
Derivatives Of

Phenanthroline dioxothiadiazoles are redox active molecules that form stable radical anions suitable for the construction of supramolecular magnetic materials. Herein, the preparation, structures and magnetic properties of bis(triphenylphosphine)iminium (PPN) salts of [1,2,5]thiadiazole[3,4-f][1,10]phenanthroline 1,1-dioxide (L), [1,2,5]thiadiazole[3,4-f][4,7]phenanthroline 1,1-dioxide (4,7-L), 5-bromo-[1,2,5]thiadiazolo[3,4-f][1,10]phenanthroline 2,2-dioxide (BrL), and 5,10-dibromo-[1,2,5]thiadiazolo[3,4-f][1,10]phenanthroline 2,2-dioxide (diBrL) are reported. The preparation of new bromo derivatives of the L: 5-bromo-[1,2,5]thiadiazolo[3,4-f][1,10]phenanthroline 2,2-dioxide (BrL) and 5,10-dibromo-[1,2,5]thiadiazolo[3,4-f][1,10]phenanthroline 2,2-dioxide (diBrL)—suitable starting materials for further derivatization—are described starting from a commercially available and cheap 1,10-phenanthroline. All PPN salts show antiferromagnetic interactions between the pairs of radical anions, which in the case of PPN(diBrL) are very strong (−116 cm−1; using Ĥ = −2JSS type of exchange coupling Hamiltonian) due to a different crystal packing of the anion radicals as compared to PPN(L), PPN(4,7-L), and PPN(BrL).

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