Journal
CRYSTENGCOMM
Volume 18, Issue 33, Pages 6143-6148Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ce01100d
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Funding
- National Natural Science Foundation of China (NSFC) [21101067]
- Self-determined Research Funds of Central China Normal University under the supervision of the Ministry of Education, P.R. China [CCNU14A05013]
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Four new coordination metallacrowns were obtained via self-assembly of Fe(III) and Mn(III) ions with N-1',N-5'-bis(5-X-2-hydroxybenzoyl)glutarohydrazide (X = Cl, H(6)pentaCShz; X = Br, H(6-)pentaBShz) in DMF at room temperature. These metallacrowns consist of four or ten [M-N-N] repeated units with M = Fe(III) for 1 and 2, and M = Mn(III) for 3 and 4. In the systems containing different metal salts, it has been demonstrated that the 12-membered rings in 1 and 2 can be augmented to 30-membered cycles in 3 and 4 due to their metal coordination nature. Quasi-tetrahedra are formed in the tetra-nuclear ferric compounds and two fused distorted tetrahedra are accommodated in the deca-nuclear manganic ones. In other words, the morphologies of the metallacrowns in 1-4 are controlled by varying the metal and flexibility of the glutaryl group in H(6)pentaXShz. Magnetic studies of all the four compounds indicate antiferromagnetic coupling interactions between adjacent metal centers.
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