An experimental and theoretical magneto-structural study of polynuclear Ni(II) complexes assembled from a versatile bis(salicylaldehyde)diamine polytopic ligand

Dalton Transactions : an International Journal of Inorganic Chemistry
Itziar OyarzabalE Colacio

Abstract

Six novel Ni(II) complexes, ranging from mononuclear to tetranuclear, have been prepared from the polytopic symmetrical Mannich base ligand N,N'-dimethyl-N,N'-bis(2-hidroxy-3-formyl-5-bromo-benzyl)ethylenediamine (H2L) and different anionic coligands: [Ni(H2L)(NO3)(H2O)]NO3·H2O (), [Ni2(μ-L)(acac)2(H2O)]·CH3CN (), [Ni2(μ-L)(μ-OAc)(NCS)] (), [Ni3(μ-L)2(μ-OH2)2(H2O)(CH3CN)](NO3)2·4CH3CN (), [Ni4(μ-L)2(μ-OAc)2(μ-OCH3)2]·6H2O·2CH3OH () and [Ni4(μ-L)2(μ-OAc)2(μ-N3)2]·2H2O·CH3OH (). These complexes have been characterized by single crystal X-ray diffraction, magnetic measurements and DFT theoretical calculations. The structural analysis of these complexes reveals that the anionic coligand and reaction conditions play a fundamental role in determining their final structures and magnetic properties. Compound contains a monomeric cationic unit with the nickel ion coordinated in the external O4 site of the compartmental ligand H2L, which acts in a neutral zwitterionic form. Complexes and are dinuclear Ni2 neutral entities, in which the Ni(II) ions are connected through two μ-phenoxido bridging groups. The Ni(O)2Ni bridging fragment in is almost planar, whereas in is bent due to the additional presence of a syn-syn acetate bridge connecti...Continue Reading

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Citations

Sep 5, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Rahman BikasNader Noshiranzadeh
Jan 28, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Santarupa ThakurtaArshak A Tsaturyan
Apr 22, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Sidney S WoodhousePaul G Plieger

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