Coordination of trivalent lanthanum with polyethylene glycol in the presence of picrate anion

Spectroscopic and X-ray structural studies

Muhammad I. Saleh, Eny Kusrini, Bahruddin Saad, Hoong Kun Fun, Bohari Mohd. Yamin

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The effect of polyethylene chain length on molecular structures of lanthanum-picrate-polyethylene glycol (PEG) complexes has been studied. The change in the ability of the inner coordination sphere to accommodate the largest size of La3+ has been investigated in complexes with the ligands triethylene glycol (EO3), tetraethylene glycol (EO4), and pentaethylene glycol (EO5). The X-ray studies demonstrated that the complexes [La(Pic)2(EO3)2]+(Pic)- (I and II), [La(Pic)2(OH2)(EO4)]+(Pic)-·H2O (III), and [La(Pic)2(EO5)]+(Pic)- (IV) crystallized in the monoclinic system in space groups P21/c (I and IV), Pn (II), and C2/c (III). Compounds I and II are polymorphs. The La3+ coordination with the PEG ligand in the presence of picrate anion (Pic) showed a coordination number of 10. The number of oxygen donor atoms dictated the geometry of the inner coordination sphere and the formation of additional inner-sphere ligands through the incorporation of water molecules, especially in III. The result with III is due to the availability of free space in the complex and to the lack of saturation of the inner coordination sphere. All crystals were further stabilized by π-π interactions stacking along the a-axis. No dissociation of La-O bonds in solution was observed in NMR studies conducted at different temperatures.

Original languageEnglish
Pages (from-to)428-440
Number of pages13
JournalJournal of Alloys and Compounds
Volume474
Issue number1-2
DOIs
Publication statusPublished - 17 Apr 2009

Fingerprint

Lanthanum
Polyethylene glycols
Anions
Negative ions
Glycols
X rays
Ligands
Polyethylene
Polymorphism
Chain length
Molecular structure
Polyethylenes
Nuclear magnetic resonance
Availability
Oxygen
Atoms
Crystals
Molecules
Geometry
picric acid

Keywords

  • Crystal structure
  • Thermal analysis
  • X-ray diffraction

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Chemistry
  • Metals and Alloys

Cite this

Coordination of trivalent lanthanum with polyethylene glycol in the presence of picrate anion : Spectroscopic and X-ray structural studies. / Saleh, Muhammad I.; Kusrini, Eny; Saad, Bahruddin; Fun, Hoong Kun; Mohd. Yamin, Bohari.

In: Journal of Alloys and Compounds, Vol. 474, No. 1-2, 17.04.2009, p. 428-440.

Research output: Contribution to journalArticle

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