Complexes of the lanthanides with neutral oxygen donor ligands

Koppikar, D. K.; Sivapullaiah, P. V.; Ramakrishnan, Latha; Soundararajan, S.

doi:10.1007/bfb0116543

Cited by 54 publications

(16 citation statements)

References 272 publications

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“…Sulfoxides contain a soft sulfur and a hard oxygen, both of which can act as nucleophiles. Although both oxygen and sulfur coordinated sulfoxide complexes are known with transition and non-transition metal ions [26,27], only oxygen coordinated sulfoxide coordination compounds are formed with the lanthanide metal ions [5]. In the infrared spectra of free DPSO, the (S=O) stretching vibration [26][27][28] appears as a strong band at 1030 cm -1 , while in the spectra of its coordination compounds, it is shifted to 960-950 cm -1 ( Table 3).…”

Section: Infrared Spectramentioning

confidence: 99%

“…Because of their larger size, the lanthanide ions generally gave higher coordination numbers than transition elements [1][2][3][4][5]. Typical coordination numbers for transition metal ions are 4 and 6, the coordination being square planar, tetrahedral or octahedral.…”

Section: Introductionmentioning

confidence: 99%

“…Coordination numbers greater than 6 are not common for transition elements. On the other hand lanthanide ions with their high positive charge and larger size are the best candidates to form stable complexes with high coordination numbers and generally coordination numbers of 6 to 10 are observed [1][2][3][4][5]. In the present study, we report the synthesis and physico-chemical properties of some seven and ten coordinated complexes of trivalent lanthanides derived *Corresponding author.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis, physico-chemical and thermal characteristics of seven and ten coordinated complexes of trivalent lanthanides derived from 4[N-(cinnamalidene)amino]antipyrine semicarbazone and diphenyl sulfoxide

Agarwal

Prakash

Kumar

et al. 2007

JICS

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In present studies a new series of twenty four complexes of seven and ten coordinated compounds derived from 4[Ncinnamalidene)amino]antipyrine semicarbazone (CAAPS) as primary ligand and diphenyl sulfoxide (DPSO) as secondary ligand has been reported. All the complexes have the general composition LnX 3 .n(CAAPS).DPSO (Ln = La, Pr, Nd, Sm, Gd, Tb, Dy or Ho, X = NCS or ClO 4 , n = 2, X = NO 3 , n = 1). The compounds have been characterized by elemental analysis, molar conductance, magnetic susceptibility, infrared and electronic spectra. Thermal characteristics were also reported. Based on the data appropriate structures are assigned for these complexes.

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Section: Infrared Spectramentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis, physico-chemical and thermal characteristics of seven and ten coordinated complexes of trivalent lanthanides derived from 4[N-(cinnamalidene)amino]antipyrine semicarbazone and diphenyl sulfoxide

Agarwal

Prakash

Kumar

et al. 2007

JICS

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“…ebaaps is a neutral tridentate (O, N, N) ligand ,and pyridine is coordinating to the central metal ion through its hetero -N atom. Thus, a coordination number of 7 is assigned to these complexes as shown below in a general structure of the complexes 40 ( Figure. 2). …”

Section: Stereochemistrymentioning

confidence: 99%

Synthesis and Characterization of Some Seven Coordinated Complexes of Lanthanide(iii) Perchlorates with 4-[n-(4‘- Ethylbenza-lideneamino)]- Antipyrine Semicarbazone as Primary Ligand and Pyridine as Secondary Ligand

Kaushik¹

2017

Orient. J. Chem

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Mixed ligands complexes of lanthanide(ΙΙΙ) perchlorates obtained from 4-[N-(ethylbenzalideneamino)]-antipyrine semicarbazone (ebaaps) as primary ligand and pyridine(py) as secondary ligand have been synthesized and characterized. The analytical studies on these compounds include elemental analyses, molecular weight determination, molar conductance, and magnetic susceptibility, infrared and electronic spectra. The primary ligand, (ebaaps), in these complexes behaves as neutral tridentate (O,N,N) while the secondary ligand pyridine(py) acts as unidentate nitrogen donor. The general composition of these complexes may be given as [Ln(ebaaps) 2 .py](ClO4) 3 , [ Ln = La, Pr, Nd, Sm, Gd, Tb, Dy or Ho]. The values of nephelauxetic effect (β), covalence factor (b 1/2 ), Sinha parameter (δ %) and the angular overlap parameter (η) of the complexes have been calculated, and their thermal stabilities worked out by TGA.

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“…Hence all the three nitrate groups are present inside the coordination sphere. Infrared data reveal the bidentate nature of NO 3 -, thus the lanthanide ion is surrounded by six oxygen atoms of three bidentate nitrate ions, two nitrogens and one sulfur atom of HNAAPTS, thus producing a coordination number of nine for the lanthanide ion [27].…”

Section: Stereochemistrymentioning

confidence: 99%

Synthesis and magneto-spectral investigations of some six and nine coordinated complexes of lanthanides(III) derived from 4[N-(2′-hydroxy-1′-naphthalidene) amino]antipyrinethiosemicarbazone

Agarwal

Garg²,

Sindhu³

2005

JICS

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The present work describes the synthesis and characterization of some six and nine coordinated complexes of trivalent lanthanide(III) with 4[N-(2´-hydroxy-1´-naphthalidene)amino]antipyrinethiosemicarbazone (HNAAPTS). All the complexes have the general composition LnX 3 .n(HNAAPTS) (X = NO 3 -, n = 1; X = NCS -or ClO 4 -, n = 2). The complexes were characterized through elemental analyses, molar mass, conductivity measurements, magnetic susceptibilities, and infrared and electronic spectra. Infrared spectra revealed that HNAAPTS acts as a neutral tridentate (N,N,S) donor. The coordination number in these complexes is either six or nine depending on the nature of the anionic ligand.

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Complexes of the lanthanides with neutral oxygen donor ligands

Cited by 54 publications

References 272 publications

Synthesis, physico-chemical and thermal characteristics of seven and ten coordinated complexes of trivalent lanthanides derived from 4[N-(cinnamalidene)amino]antipyrine semicarbazone and diphenyl sulfoxide

Synthesis, physico-chemical and thermal characteristics of seven and ten coordinated complexes of trivalent lanthanides derived from 4[N-(cinnamalidene)amino]antipyrine semicarbazone and diphenyl sulfoxide

Synthesis and Characterization of Some Seven Coordinated Complexes of Lanthanide(iii) Perchlorates with 4-[n-(4‘- Ethylbenza-lideneamino)]- Antipyrine Semicarbazone as Primary Ligand and Pyridine as Secondary Ligand

Synthesis and magneto-spectral investigations of some six and nine coordinated complexes of lanthanides(III) derived from 4[N-(2′-hydroxy-1′-naphthalidene) amino]antipyrinethiosemicarbazone

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