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The Simple Hexapyridine Cluster [Mo 6 Br 8 Py 6 ][OSO 2 CF 3 ] 4 and Substituted Hexapyridine Clusters Including a Cluster‐cored Polyolefin Dendrimer
Author(s) -
Méry Denise,
Plault Lauriane,
Nlate Sylvain,
Astruc Didier,
Cordier Stéphane,
Kirakci Kaplan,
Perrin Christiane
Publication year - 2005
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200500121
Subject(s) - chemistry , pyridine , octahedron , molybdenum , trifluoromethanesulfonate , cluster (spacecraft) , stereochemistry , medicinal chemistry , yield (engineering) , crystallography , crystal structure , inorganic chemistry , catalysis , organic chemistry , computer science , programming language , materials science , metallurgy
The yellow octahedral molybdenum cluster [ n ‐Bu 4 N] 2 [Mo 6 Br 8 (CF 3 SO 3 ) 6 ], ( 1 ); undergoes substitution of all six terminal triflate ligands by pyridine ligands in pyridine/THF at 60 °C to yield the orange hexapyridine cluster [Mo 6 Br 8 (Py) 6 ][CF 3 SO 3 ] 4 , ( 2 ). The cluster 1 also reacts in THF at 60 °C with excessof the para ‐substitued pyridines 4‐ tert ‐Bupy and 4‐vinylpy to give the orange para ‐substituted hexapyridine clusters [Mo 6 Br 8 ( p ‐Py‐R) 6 ][CF 3 SO 3 ] 4 ( 3 : R = tert ‐Bu; 4 : R = vinyl) and with the new dendronic pyridine derivative 3,3′‐{CH 2 O p ‐C 6 H 4 C(CH 2 CH=CH 2 ) 3 } 2 Py, ( 5 ) (7 d), to give the orange relatively air stable Mo 6 ‐cluster‐cored 36‐allyl dendrimer [Mo 6 Br 8 (3,5‐{CH 2 OC 6 H 4 C(CH 2 CH=CH 2 ) 3 } 2 Py) 6 ][CF 3 SO 3 ] 4 , ( 6 ). All these substitution reactions were easily monitored by 1 H NMR in CDCl 3 using the comparison between the intensities of the tetrabutylammonium cation and deshielded coordinated pyridine signals.