Mn Schiff revised.pdf (730.64 kB)
Manganese coordination chemistry of bis(imino)phenoxide derived [2 + 2] Schiff-base macrocyclic ligands
journal contribution
posted on 2016-04-29, 11:27 authored by Wenxue Yang, Ke-Qing Zhao, Bi-Qin Wang, Carl Redshaw, Mark ElsegoodMark Elsegood, Jiang-Lin Zhao, Takehiko YamatoThe [2 + 2] Schiff-base macrocycles [2,2’-(CH2CH2)(C6H4NvCH)2-2,6-(4-RC6H2OH)]2 (IRH2), upon reaction with MnCl2 (two equivalents) afforded the bimetallic complex [Cl3Mn(μ-Cl)Mn(IMeH2)] (1) or the salt complex [Cl3Mn(NCMe)][MnCl(ItBuH2)] (2). Under similar conditions, use of the related [2 + 2] oxy-bridged macrocycle [2,2’-O(C6H4NvCH)2-4-RC6H2OH] (IIRH2), afforded the bimetallic complexes [(MnCl)2IIR] (R = Me 3, tBu 4), whilst the macrocycle derived from 1,2-diaminobenzene and 5,5’-di-tert-butyl-2,2’-dihydroxy-3,3’-methylenedibenzaldehyde (IIIH4) afforded the complex [(MnCl)2(III)]·2MeCN (5·2MeCN). For comparative studies, the salt complexes [2,6-(ArNHCH)2-4-MeC6H2O][MnCl3(NCMe)] (Ar = 2,4-Me2C6H3, 6) and {[(2-ArNvCH),6-(ArNHCH)-4-Me-C6H2O]MnCl}2[MnCl4]·8CH2Cl2 (Ar = 4-MeC6H4, 7·8CH2Cl2) were prepared. The crystal structures of 1–7 are reported (synchrotron radiation was necessary for complexes 1, 3 and 5). Complexes 1–7 (not 5) were screened for their potential to act as pre-catalysts for the ring opening polymerization (ROP) of e-caprolactone; 3, 4 and 6, 7 were inactive, whilst 1 and 2 exhibited only poor activity with low conversion (<15%) at temperatures above 60 °C.
Funding
We thank Sichuan Normal University and the National Natural Science Foundation of China (Grants 51443004 and 51273133) for financial support. The Special Funds for sharing large precision equipment (No. DJ2014-22) at Sichuan Normal University is also thanked. The EPSRC is thanked for a travel award (EP/L012804/1) to CR.
History
School
- Science
Department
- Chemistry
Published in
DALTON TRANSACTIONSVolume
45Issue
1Pages
226 - 236 (11)Citation
YANG, W. ... et al., 2016. Manganese coordination chemistry of bis(imino)phenoxide derived [2 + 2] Schiff-base macrocyclic ligands. Dalton Transactions, 45 (1), pp.226-236.Publisher
© Royal Society of ChemistryVersion
- AM (Accepted Manuscript)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/Publication date
2015-11-10Notes
This paper was accepted for publication in the journal Dalton Transactions and the definitive published version is available at http://dx.doi.org/10.1039/c5dt03453a.ISSN
1477-9226eISSN
1477-9234Publisher version
Language
- en