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From Simple Monopyridine Clusters [Mo6Br13(Py-R)][n-Bu4N] and Hexapyridine Clusters [Mo6X8(Py-R)6][OSO2CF3
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文摘
Hexasubstitution 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 mages/entities/deg.gif">C with simplepyridines 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 orangepyridine-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, andair-fragile and thermally fragile with large dendronized pyridines.

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