The Magnetic Properties of Transition Metal Complexes

Figgis, Brian N.; Lewis, Jack

doi:10.1002/9780470166079.ch2

Cited by 632 publications

(96 citation statements)

References 412 publications

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“…The Cr(III) complexes are synthesized with L3, L4, L5, and L6 and are characterized [72,73] as having Oh geometry as shown in Table 14; Figure 3. The magnetic moments of L6 and L4 (prepared at pH 8.5) at RT are close to the expected spin-only value for Oh complexes of Cr(III) [72][73][74][75]. The other complexes show lower values and so may be due to metal-metal interactions with binuclear bridge structures.…”

Section: Cr(iii)mentioning

confidence: 69%

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Characterization of Complexes Synthesized Using Schiff Base Ligands and Their Screening for Toxicity Two Fungal and One Bacterial Species on Rice Pathogens

Mangamamba¹,

Ganorkar²,

Swarnabala

2014

International Journal of Inorganic Chemistry

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Coordination complexes with metal ions Cu(II), Ni(II), Co(II), Fe(III), Mn(II), Cr(III), and VO(II) with six ligands formed by condensation products using azides and aldehydes or ketones are characterized. Both the ligands and the complexes synthesized are characterized by C, H, N, Cl and metal analyses, IR, UV-Vis, TGA, and magnetic susceptibility for tentative structure proposal. Several of them are screened for their toxicity (i.e., physiological activity) against fungal species Rhizoctonia solani and Acrocylindrium oryzae and a bacterium, Xanthomonas oryzae on rice pathogens. The study shows that the observed physiological activity is enhanced for the metal complexes as compared to the simple metal salts or ligands, except in the case of L3 or HAEP ligand, where the free -OH and -NH 2 groups on the ligand seemed to have inhibited the activity. It is also observed that the order of activity has a dependence on the increased atomic weight of the metal ion in use. In some cases, especially the VO(II) complexes, they are found to be better than the standards in use, both for the fungicides and for the bactericide.

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Section: Cr(iii)mentioning

confidence: 69%

“…In regular Oh complexes of Ni(II) consideration of spin-orbit coupling and contribution from the 3A2g and the next higher 3T2g states give a somewhat higher magnetic moment than the spin-only moment of 2.83 BM [72,82,83].…”

Section: Ni(ii)mentioning

confidence: 99%

Characterization of Complexes Synthesized Using Schiff Base Ligands and Their Screening for Toxicity Two Fungal and One Bacterial Species on Rice Pathogens

Mangamamba¹,

Ganorkar²,

Swarnabala

2014

International Journal of Inorganic Chemistry

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“…The magnetic moment values for the Co(II) complexes reported here in the range 4.58-4.86 B.M. show that there are three unpaired electrons indicating a high spin octahedral configuration [31]. Cu(II) complex has magnetic moment value 1.79-1.91 B.M.…”

Section: Electronic Spectramentioning

confidence: 86%

Syntheses, spectral characterization, thermal properties and DNA cleavage studies of a series of Co(II), Ni(II) and Cu(II) polypyridine complexes with some new schiff-bases derived from 2-chloroethylamine

2015

Can. Chem. Trans.

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“…The first examples, by König and Madeja,17 were of the type cis-[Fe(NCS) 2 (1,10-phen) 2 ] and the 2,2 -bipy analogue, with a Fe II N 6 mixed heterocyclic/pseudohalide(N) donor set providing the appropriate ligand-field. There are many such related pyridine-containing ligand systems that make up the FeN 6 chromophore, including the tetradentate tripyridylmethylamine compounds, [Fe(NCS) 2 (TPA)], 18 and the bis-dipyridylamine [Fe(NCS) 2 (DPA) 2 ] 19 complexes or congeners thereof, such as the DPA-substituted triazines to be discussed later.…”

Section: Introductionmentioning

confidence: 99%

“…[25][26][27] Goodwin et al made extensive studies on the synthesis, structure, Mössbauer spectra and magnetism of a variety of pyrazolyl-pyridine chelates of Fe(II) 28 and these have led to further recent advances by Halcrow, 29 Létard, 30 Ruben and co-workers. 31 Cobalt(II) d 7 SCO complexes were some of the earliest to be investigated, by Baker et al and Martin et al, the [Co(terpy) 2 ](anion) 2 systems showing gradual spin-transitions that were sensitive to changes in anion. 32,33 1980-2012 period.…”

Section: Introductionmentioning

confidence: 99%