Mukherjee, Pampa ; Drew, Michael G. B. ; Goomez-García, Carlos J. ; Ghosh, Ashutosh (2009) The crucial role of polyatomic anions in molecular architecture: structural and magnetic versatility of five nickel (II) complexes derived from A N,N,O-donor Schiff base ligand Inorganic Chemistry, 48 (13). pp. 5848-5860. ISSN 0020-1669
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Official URL: http://pubs.acs.org/doi/abs/10.1021/ic9001863
Related URL: http://dx.doi.org/10.1021/ic9001863
Abstract
Five new nickel (II) complexes [Ni2L2 (N3)2(H2O) 2] (1), [Ni2L2(NO3)2] (2), [Ni2L2 (O2CPh)(CH3OH) 2]ClO4.0.5CH3OH (3), [Ni3L2(O2CPh)4] (4) and [Ni2L2(NO2)2]n (5) have been synthesized by using a tridentate Schiff base ligand, HL (2-[(3-Methylamino-propylimino)-methyl]-phenol) and the polyatomic monoanions N3−, NO3−, PhCOO− or NO2−. The complexes have been structurally and magnetically characterized. The structural analysis reveals that in all five complexes, the Ni (II) ions possess a distorted octahedral geometry. Complexes 1 and 2 are dinuclear with di-μ-1,1-azido and di-μ2-phenoxo bridges, respectively. Complex 3 is also a di-μ2-phenoxo-bridged dinuclear Ni(II) complex but has an additional syn−syn benzoate bridge. Compound 4 possesses a linear trinuclear structure with the tridentate Schiff base ligand coordinated to the terminal nickel atoms which are linked to the central Ni(II) by phenoxo and carboxylate bridges. Complex 5 consists of a dinuclear entity, bridged by di-μ 2-phenoxo together with a cis-(μ-nitrito-1κO:2μN) nitrite ion. The dinuclear units are linked each other by another bridging trans-(μ-nitrito-1κO:2κN) nitrite to form a Ni(II) chain that shows the presence of unprecedented alternating cis- and trans-N,O bridging mode of the nitrite anion. Variable-temperature magnetic susceptibility measurements of complex 1 indicate the presence of ferromagnetic exchange interactions within the dimer (J = 23.5(3) cm−1) together with antiferromagnetic interdimer interactions (J′ = −0.513(3) cm−1), whereas compounds 2 and 3 show intradimer antiferromagnetic interactions (J = −24.27(6) and −16.48(4) cm−1, respectively). Ferromagnetic coupling (J = 6.14(2) cm−1) is observed in complex 4 for the linear centro-symmetric Ni(II) trimer, whereas complex 5 shows an alternating intra-chain antiferromagnetic coupling (J1 = −32.1(1) cm−1 and J2 = −3.2(1) cm−1).
| Item Type: | Article |
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| Source: | Copyright of this article belongs to American Chemical Society. |
| ID Code: | 108346 |
| Deposited On: | 13 Oct 2017 12:48 |
| Last Modified: | 13 Oct 2017 12:48 |
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