[M(NCS)6]3(2)- (M=MoIII,ReIV) as building units in molecular magnetism / Mousavi Sangdehi, Maliheh Sadat  

Public ISBD Titre : [M(NCS)6]3(2)- (M=MoIII,ReIV) as building units in molecular magnetism Type de document : texte imprimé Auteurs : Mousavi Sangdehi, Maliheh Sadat, Auteur ; Jean-Pascal Sutter, Directeur de thèse ; Béreau, Virginie, Directeur de thèse Année de publication : 2011 Langues : Anglais (eng) Tags : MOLECULAR MAGNETISM  THIOCYANO  EXCHANGE INTERACTION  MO(III)  RE(IV)  HETERONUCLEAR  DFT CALCULATIONS  MOLECULAR MATERIALS Résumé : "This thesis concerns the field of molecular magnetic materials. Our goal was to investigate the potential of the {M(NCQ)6}3-, (M = MoIII, ReIV; Q = S, Se) anionic complexes for the preparation of thiocyanato-bridged {3d-4(5)d} heterometallic compounds with efficient exchange couplings. Spin density distributions obtained from DFT calculations on {Mo(NCS)6}3-, {Mo(NCSe)6}3-, {Re(NCS)6}2- show that the magnetic information is efficiently transferred from the metal to the ligands. Experimental insights into the magnetic communication mediated by NCS between MoIII and either Co, Ni have been deduced from the magnetic behavior of a series of isomorphic compounds of formula {[M(NCQ}6{M'LN4}2(NCS)] (M = CrIII, MoIII; M' = NiII, CoII ; Q = S, Se). The magnetic studies and their analysis show that Mo-NCS-Ni interaction is strong (JMoNi/Co = -50 cm-1) and twice Cr-Ni interaction. Because S atom can bind preferentially soft metal ions, we have used this property to obtain the mixed valence coordination polymer [{Mo(NCS}6{NiIILN4}]8{CoIIILN4Br2} and the related heterotrimetallic derivative [{Mo(NCS}6{NiIILN4}]8{CoIIILN4Br2}. We also describe a bidimensional system {Mo2Co3} which behaves as a ferri-magnet with TC = 40 K. Two examples of hetero-metallic architectures Mo-Cu are presented and finally, in the last part of this manuscript, the formation of polymetallic aggregates between Ni or Cu-Schiff bases complexes and potassium salts are described." Document : Thèse de Doctorat Etablissement_delivrance : Université de Toulouse 3 Date_soutenance : 08/12/2011 Ecole_doctorale : Sciences de la matière (SdM) Domaine : Chimie organométallique et de coordination Localisation : LCC En ligne : http://thesesups.ups-tlse.fr/1718/ [M(NCS)6]3(2)- (M=MoIII,ReIV) as building units in molecular magnetism [texte imprimé] / Mousavi Sangdehi, Maliheh Sadat, Auteur ; Jean-Pascal Sutter, Directeur de thèse ; Béreau, Virginie, Directeur de thèse . - 2011. Langues : Anglais (eng) Tags : MOLECULAR MAGNETISM  THIOCYANO  EXCHANGE INTERACTION  MO(III)  RE(IV)  HETERONUCLEAR  DFT CALCULATIONS  MOLECULAR MATERIALS Résumé : "This thesis concerns the field of molecular magnetic materials. Our goal was to investigate the potential of the {M(NCQ)6}3-, (M = MoIII, ReIV; Q = S, Se) anionic complexes for the preparation of thiocyanato-bridged {3d-4(5)d} heterometallic compounds with efficient exchange couplings. Spin density distributions obtained from DFT calculations on {Mo(NCS)6}3-, {Mo(NCSe)6}3-, {Re(NCS)6}2- show that the magnetic information is efficiently transferred from the metal to the ligands. Experimental insights into the magnetic communication mediated by NCS between MoIII and either Co, Ni have been deduced from the magnetic behavior of a series of isomorphic compounds of formula {[M(NCQ}6{M'LN4}2(NCS)] (M = CrIII, MoIII; M' = NiII, CoII ; Q = S, Se). The magnetic studies and their analysis show that Mo-NCS-Ni interaction is strong (JMoNi/Co = -50 cm-1) and twice Cr-Ni interaction. Because S atom can bind preferentially soft metal ions, we have used this property to obtain the mixed valence coordination polymer [{Mo(NCS}6{NiIILN4}]8{CoIIILN4Br2} and the related heterotrimetallic derivative [{Mo(NCS}6{NiIILN4}]8{CoIIILN4Br2}. We also describe a bidimensional system {Mo2Co3} which behaves as a ferri-magnet with TC = 40 K. Two examples of hetero-metallic architectures Mo-Cu are presented and finally, in the last part of this manuscript, the formation of polymetallic aggregates between Ni or Cu-Schiff bases complexes and potassium salts are described." Document : Thèse de Doctorat Etablissement_delivrance : Université de Toulouse 3 Date_soutenance : 08/12/2011 Ecole_doctorale : Sciences de la matière (SdM) Domaine : Chimie organométallique et de coordination Localisation : LCC En ligne : http://thesesups.ups-tlse.fr/1718/

---

1 (1 - 1 / 1) Par page : 25 50 100 200