NDLI: Ferrocene -based compartmental ligand for the assembly of neutral $Zn^{II}/Ln^{III}$ heterometallic complexes

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Sañudo, E. Carolina Chandrasekhar, Vadapalli Chakraborty, Amit
Description	Author Affiliation: Chandrasekhar V ( Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016, India. vc@tifrh.res.in)
Abstract	A ferrocene -based compartmental ligand , $H_{2}L,$ was synthesized by the reaction of diacetyl ferrocene with hydrazine hydrate followed by a condensation reaction with o-vanillin . $[L]^{2−}$ possesses a dual coordination pocket, an inner pocket of 2 imino nitrogens and two phenolate oxygens and an outer pocket of two phenolate and two methoxy oxygen atoms. Utilizing this ligand , several $Zn^{II}/Ln^{III}$ heterobimetallic complexes were assembled: $[LZn(μ-OAc)Dy(NO_{3})_{2}]$ (2), $[LZn(μ-OAc)Tb(NO_{3})_{2}]$ (3), $[LZn(μ-OAc)Gd(NO_{3})_{2}·2CHCl_{3}]$ (4), $[LZn(μ-OAc)Er(NO_{3})_{2}]$ (5), $[LZn(μ-OAc)Ho(NO_{3})_{2}]$ (6), $[LZn(μ-OAc)Eu(NO_{3})_{2}]$ (7). All of these metal complexes are neutral and isostructural: the $Zn^{II}$ ion occupies the inner coordination pocket while the $Ln^{III}$ ion occupies the outer coordination pocket of the doubly deprotonated ligand $[L]^{2−}.$ Zn(II) has a coordination number of 5 (2N, 3O) in a square pyramidal coordination geometry while Ln(III) has a coordination number of 9 (9O) in a distorted tricapped trigonal prismatic geometry. Zn(II) and the 4f metal ion are bridged to each other by two phenolate oxygen atoms and an acetate ligand . ESI-MS reveals that 2–7 retain their structural integrity in solution. Cyclic voltammetry of 1–7 revealed a quasi-reversible oxidation (involving the ferrocene motif) and an irreversible reduction of the hydrazone unit. Magnetic studies of 2, 3 and 6 were carried out. Ac susceptibility studies did not reveal slow relaxation of magnetization.
ISSN	14779226
Issue Number	37
Volume Number	42
e-ISSN	13645447
Journal	Dalton Trans.
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2013-10-07
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Coordination Complexes Chemical Synthesis Ferrous Compounds Chemistry Lanthanoid Series Elements Zinc Ligands Models, Molecular Molecular Structure Journal Article Research Support, Non-U.S. Gov't
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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