Ainsi, l'expression M est un ion mtallique choisi dans le groupe comprenant Fe 2+ , Fe 3+ , Zn 2+ , Ti 3+ , Ti 4+ , Zr 2+ , Zr 4+ Ca 2+ , Cu 2+ , Gd 3+ , Mg 2+ , Mn 2+ , Mn 3+ , Mn 4+ , Si 4+ figurant ci- dessus et dans le prsent document est quivalente l'expression : chaque occurrence de M reprsente indpendamment un ion mtallique choisi dans le groupe comprenant Fe , Fe 3+ , Zn 2+ Ti 3+ Ti 4+ , Zr 2+ , Zr 4+ Ca 2+ A linear, branched or cyclic, optionally substituted alkyne, or a mono- or poly-cyclic aryl comprising 6 to 50 carbon atoms, optionally branched and / or substituted
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