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Manganese coordination chemistry of bis(imino)phenoxide derived [2 + 2] Schiff-base macrocyclic ligands

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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 Yamato
The [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 TRANSACTIONS

Volume

45

Issue

1

Pages

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 Chemistry

Version

  • 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

2015-11-10

Notes

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

1477-9226

eISSN

1477-9234

Language

  • en