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• W2143392455 abstract "Abstract Previous studies have demonstrated that [(CN) 2 AlCl] and [R 2 Al(μ‐CN)] 2 (CN=deprotonated cinchonine) complexes can effectively act as chiral, semirigid, N,N ‐ditopic metalloligands for Zn‐containing nodes, and provide viable means for constructing new, homochiral, heterometallic, coordination polymers of zigzag and helical topologies. These findings have prompted further investigations on the organometallic analogues of the formula [(CN) 2 AlR], anticipating their utility as N,N ‐metalloligands for ZnR 2 units. Surprisingly, reactions of [(CN) 2 AlMe]‐type metalloligands with ZnR 2 compounds (R=Me or Et) revealed unprecedented ligand‐exchange processes, including zinc‐to‐aluminium and aluminium‐to‐zinc transmetalations of alkyl groups. The molecular and crystal structure of the resulting compounds was determined by X‐ray diffraction analysis. From the reaction of [(CN) 2 AlMe] with ZnMe 2 a new pseudopolymorphic form of a noncovalent porous material based on [Me 2 Al(μ‐CN)] 2 molecules was isolated. Strikingly, the analogous reaction involving ZnEt 2 led to the generation of a new chiral 4 N ‐tetratopic heterometalloligand [(CN)EtAl(μ‐CN) 2 ZnEt]. The latter unit was successfully connected by alkyl‐exchanged ZnMe 2 nodes to give an original homochiral heterometallic {[(CN)EtAl(μ‐CN) 2 ZnEt]ZnMe 2 } n coordination polymer adopting a snake 1D motif. The outcome of the revealed reactions indicates the complicated multistep reaction route that involves redistribution of cinchonine and alkyl ligands among the Al and Zn centers, and a general reaction scheme is proposed. The results are in strong contrast with the previously studied inorganic–organic [(CN) 2 AlCl/ZnCl 2 ] system, which exclusively affords a helical coordination polymer based on ZnCl 2 nodes and (CN) 2 AlCl metalloligands and lacks the exchange of CN ligands." @default.
• W2143392455 created "2016-06-24" @default.
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• W2143392455 date "2012-09-05" @default.
• W2143392455 modified "2023-10-18" @default.
• W2143392455 title "New Insights into Cinchonine-Aluminium Complexes and Their Application as Chiral Building Blocks: Unprecedented Ligand-Exchange Processes in the Presence of ZnR₂Compounds" @default.
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• W2143392455 doi "https://doi.org/10.1002/chem.201202295" @default.
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• W2143392455 hasPublicationYear "2012" @default.
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