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- From simple monopyridine clusters [Mo6Br13(Py-R)][n-Bu4N] and hexapyridine clusters [Mo6X8(Py-R)6][OSO2CF3]4 (X = Br or I) to cluster-cored organometallic stars, dendrons, and dendrimersPublication . Méry, Denise; Plault, Lauriane; Ornelas, Cátia; Ruiz, Jaime; Nlate, Sylvain; Astruc, Didier; Blais, Jean-Claude; Rodrigues, João; Cordier, Stéphane; Kirakci, Kaplan; Perrin, ChristianeHexasubstitution of apical triflate ligands in the octahedral clusters [M]2[Mo6X8(CF3SO3)6] (M = n-Bu4N or Cs, X = Br or I) and monosubstitution in [n-Bu4N]2[Mo6Br13(CF3SO3)] was carried out in tetrahydrofuran at 60 degrees C with simple pyridines and then extended to organometallic pyridines, yielding cluster-cored stars, and to dendronic polyallyl- and polyferrocenylpyridines, yielding cluster-cored polyallyl and polyferrocenyl dendrimers and dendrons. The orange pyridine-substituted clusters, whose pyridine protons are deshielded in 1H NMR (a practical tool for characterization), are air-stable and thermally stable with simple pyridines, light- and air-sensitive with organometallic pyridines, and air-fragile and thermally fragile with large dendronized pyridines.
- Mo6Br8-Cluster-cored organometallic stars and dendrimersPublication . Méry, Denise; Ornelas, Cátia; Daniel, Marie-Christine; Ruiz, Jaime; Rodrigues, João; Astruc, Didier; Cordier, Stéphane; Kirakci, Kaplan; Perrin, ChristianeTheoctahedralmolybdenumcluster[n-Bu4N]2[Mo6Br8(CF3SO3)6]undergoessubstitutionofallsixterminaltriflateligands withtheorganometallicpyridineligands[RuCp(PPh3)2(g1-C2-4-pyridinyl)],1,and1-ferrocenyl-2-(4-pyridinyl)acetylene,5,to give the new light and air sensitive hexa-functionalized Mo6 clusters 4 and 7 respectively, and with the dendronic phenolate ligand p-NaO–C6H4C{CH2CH2CH2Si(Me)2Fc}3, 8, to give the air-sensitive Mo6-cluster-cored octadecylferrocenyl dendrimer 9 that discloses a single CV wave in CH2Cl2 and recognizes the biologically important adenosyl triphosphate di-anion (ATP2-). The organometallic pyridines 1 and 5 were also coordinated toAg+ to give the new trinuclearAgRu2 andAgFc2 cationic complexes 2 and 6 respectively for comparison of the structures and electronic delocalization with those of the clusters.