title: A Co16 cluster and a 1-D Mn chain complex supported by benzohydroxamic acid.
abstract: The syntheses, crystal structures and magnetic properties are described for a {Co16} cluster [Co(II)16O(OH)2(bha)12(PhCO2)4(Phen)2(MeOH)4]·2MeOH (1) and a 1-D Mn(II) chain complex [Mn(Hbha)2]n·(2MeOH)n (2) (H2bha = benzohydroxamic acid; Phen = 1,10-phenanthroline). The 1 : 1 : 0.5 reaction of Co(O2CMe)2·4H2O, H2bha and 1,10-phenanthroline in MeOH at 100 °C under autogenous pressure gave cluster 1. Complex 2 was obtained from the 1 : 1 reaction mixture of Mn(O2CMe)2·2H2O and H2bha in MeOH under solvothermal conditions. The {Co16} cluster can be thought as a face-centered cube with two wings. The H2bha ligands show hydroximic form in 1 and exhibit hydroxamic mode in 2. The hydroximate ligands in 1 display three distinct binding modes, one of which is novel. Variable-temperature solid-state dc magnetic susceptibility studies have been performed in the 2.0-300 K range for complexes 1 and 2. Antiferromagnetic M(II)···M(II) exchange interactions were found for both 1 and 2. This work also demonstrates that solvothermal method is a potential synthetic approach for the design and growth of high nuclearity clusters or chain complexes of the H2bha ligand.
authors.affiliation: Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China.
authors.forename: Yanyuan
authors.initials: Y
authors.lastname: Cao
authors.forename: Yanmei
authors.initials: Y
authors.lastname: Chen
authors.forename: Lei
authors.initials: L
authors.lastname: Li
authors.forename: Dandan
authors.initials: D
authors.lastname: Gao
authors.forename: Wei
authors.initials: W
authors.lastname: Liu
authors.forename: Hailiang
authors.initials: H
authors.lastname: Hu
authors.forename: Wu
authors.initials: W
authors.lastname: Li
authors.forename: Yahong
authors.initials: Y
authors.lastname: Li