%0 Journal Article
%T Transition Metal Complexes and Radical Anion Salts of 1,10-Phenanthroline Derivatives Annulated with a 1,2,5-Tiadiazole and 1,2,5-Tiadiazole 1,1-Dioxide Moiety: Multidimensional Crystal Structures and Various Magnetic Properties
%A Yoshiaki Shuku
%A Kunio Awaga
%J Molecules
%D 2014
%I MDPI AG
%R 10.3390/molecules19010609
%X Advances in the molecular variety and the elucidation of the physical properties of 1,10-phenanthroline annulated with 1,2,5-thiadiazole and 1,2,5-thiadiazole 1,1-dioxide moieties have been achieved, and are described herein. A 1,2,5-thiadiazole compound, [1,2,5]thiadiazolo[3,4- f][1,10]phenanthroline (tdap), was used as a ligand to create multidimensional network structures based on S£¿£¿£¿S and S£¿£¿£¿N intermolecular interactions. A 1,2,5-thiadiazole 1,1-dioxide compound, [1,2,5] thiadiazolo[3,4- f][1,10]phenanthroline, 1,1-dioxide (tdapO 2), was designed to create a stable radical anion, as well as good network structures. Single crystal X-ray structure analyses revealed that transition metal complexes of tdap, and radical anion salts of tdapO 2 formed multidimensional network structures, as expected. Two kinds of tdap iron complexes, namely [Fe(tdap) 2(NCS) 2] and [Fe(tdap) 2(NCS) 2]£¿MeCN exhibited spin crossover transitions, and their transition temperatures showed a difference of 150 K, despite their similar molecular structures. Magnetic measurements for the tdapO 2 radical anion salts revealed that the magnetic coupling constants between neighboring radical species vary from strongly antiferromagnetic ( J = £¿320 K) to ferromagnetic ( J = 24 K), reflecting the differences in their ¦Ð overlap motifs.
%K spin-crossover complexes
%K intermolecular interactions
%K electron acceptors
%K radical anion salts
%U http://www.mdpi.com/1420-3049/19/1/609