State Key Laboratory of Coordination Chemistry, Coordination Chemistry Institute, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China
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Dalton Trans., 2013,42, 1842-1847
19 Sep 2012,
25 Oct 2012
First published online
25 Oct 2012
Two couples of enantiomerically pure metal phosphonates are successfully synthesized by using chiral MnIII-Schiff base mononuclear precursors. Compounds [Mn((R,R)-5-Brsalcy)(2-FC6H4PO3H)]·3H2O (1) and [Mn((R,R)-5-Brsalcy)(4-CH3C6H4PO3H)]·CH3OH·H2O (3) [5-Brsalcy = N,N′-(1,2-cyclohexanediylethylene)bis(5-bromosalicylideneiminato) dianion] are isostructural and show similar one-dimensional chain structures where the Mn((R,R)-5-Brsalcy)+ species are bridged by O–P–O units. Compounds 2 and 4 are (S,S)-enantiomers of 1 and 3, respectively. These compounds are all optically active, exhibiting second harmonic generation responses 0.3 times that of urea. The magnetic measurements of 1 and 3 reveal that dominant antiferromagnetic interactions are mediated between the MnIII centers.
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