Antiferro- to ferromagnetic crossover in diphenoxido bridged NiII2MnII complexes derived from N2O2 donor Schiff base ligands

Seth, Piya ; Figuerola, Albert ; Jover, Jesús ; Ruiz, Eliseo ; Ghosh, Ashutosh (2016) Antiferro- to ferromagnetic crossover in diphenoxido bridged NiII2MnII complexes derived from N2O2 donor Schiff base ligands Polyhedron, 117 . pp. 57-63. ISSN 0277-5387

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/j.poly.2016.05.021

Abstract

Three new trinuclear NiII–MnII complexes have been synthesized using three different “metalloligands” [NiL1], [NiL2] and [NiL3] derived from the Schiff bases H2L1 = N,N′-bis(salicylidene)-1,3-pentanediamine, H2L2 = N,N′-bis(salicylidene)-1,3-propanediamine and H2L3 = N,N′-bis(salicylidene)-1,3,-diaminopropan-2-ol), respectively. In all three complexes, [(NiL1)2Mn(OOCPh)2(H2O)2]•CH3OH (1), [(NiL2)2Mn(OOCPh)2(CH3OH)2]•CH3OH (2) and [(NiL3)2Mn(OOCPh)2(H2O)2]•CH3OH (3), in addition to the double phenoxido bridge, the two terminal NiII atoms are linked to the central MnII by means of a syn–syn bridging benzoate, giving rise to a linear structure. Complex 1 with Ni–O–Mn angle of 97.35° exhibits antiferromagnetic interactions (JNi–Mn = −0.60 cm−1) whereas ferromagnetic exchange is observed in 2 and 3 (JNi–Mn = +2.00 and +1.10 cm−1 respectively) having Ni–O–Mn angle 97.34° (in 2), 97.27° (in 3). Theoretical calculations have been performed in order to understand the effect of structural parameters that can tune the magnetic properties of this type of complexes such as small differences in the Ni–O–Mn angle and/or slight variations in intermolecular contacts within the crystal.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Manganese; Nickel; Heterometallic Complexes; Magnetic Properties; Crossover Angle
ID Code:108189
Deposited On:17 Oct 2017 12:58
Last Modified:17 Oct 2017 12:58

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