IR-Spectral Study of Solid State Complexes of Lanthanum with Mono-and<i>bis</i>-(2-Ethylhexyl) Phosphoric Acids

Arnaudov, M.; Milanova, Maria; Todorovsky, D.

doi:10.1080/00387019608001610

Cited by 6 publications

(8 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The thermochemical behaviour of La-complexes of mono-(2-ethylhexyl) phosphoric acid supports the overall composition and structure of the complexes as proposed in [10], namely: the presence of hydrated H20 and of OH-groups, associated through hydrogen bonds and taking part in a condensation process (380-450 K). It appears that the heating of La(HB)r 1.5H20 to a defined temperature might be used as method for preparation of Ln-complexes of alkyldiphosphoric acids.…”

Section: Resultsmentioning

confidence: 59%

“…La(HB)3-1.5H20. A detailed interpretation of the IR spectrum of this complex has been reported [10]. The complexes are coordinative polymers.…”

Section: Resultsmentioning

confidence: 97%

“…The stoichiometric composition of the complex presumes a 'mixed-type' bidentate coordination of La-bridging and chelating. This structure is reflected by the 1200-1000 cm -~ IR spectral region [10].…”

Section: Resultsmentioning

confidence: 99%

“…Recently, complexes of the type Ln(HB)3.nH20 and Ln2B3-nH20 have been prepared in the solid state [9]. The corresponding IR spectra were discussed relative to the spectra of the parent acids and of the LnA3-type complexes [10]. The presence of an OH-group (substituting one of the hydroearbotr fragments) in Ln(HB)vnH20 causes a significant change in the s~ructure and solubility in comparison to LnA3.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Thermochemical behaviour of lanthanum complexes of 2-ethylhexyl phosphoric acid

Milanova

Todorovsky

Arnaudov

1996

Journal of Thermal Analysis

Self Cite

View full text Add to dashboard Cite

The thermochemical behaviour of solid-state complexes of lanthanum with mono-(2-ethylhexyl) phosphoric acid (H2B) (La(HB)yl.5H20 and La2By3H20) was studied. The thermal decomposition of these complexes proceeds without melting to yield La(PO3)3 and a mixture of La(PO3)3 and LaPO4, respectively. La(HB)yl.5HzO decomposes via dehydration (323-383 K), condensation of the OH-groups with formation of a diphosphate structure (383-458 K) and a stepwise degradation of the hydrocarbon chains (443-565 K). The dehydration of LazBy3H20 (333-433 K) is followed by decomposition of the hydrocarbon group. From a combination of the present results with previous data [1], it was concluded that the temperatures and mechanisms of the decomposition of the hydrocarbon part of the lanthanide complexes of (2-ethylhexyl) phosphoric acids depend on the nature of the lanthanide, the atmosphere, and the structure of the complexes.

show abstract

Section: Resultsmentioning

confidence: 59%

“…La(HB)3-1.5H20. A detailed interpretation of the IR spectrum of this complex has been reported [10]. The complexes are coordinative polymers.…”

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Thermochemical behaviour of lanthanum complexes of 2-ethylhexyl phosphoric acid

Milanova

Todorovsky

Arnaudov

1996

Journal of Thermal Analysis

Self Cite

View full text Add to dashboard Cite

show abstract

“…，特に HDEHP の高分子について Harada ら 7-9) や Milanova [10][11][12] らによって組成や生成条件が調べられ，Ln:A -＝1:3 の錯体であることがわかっていた。結晶性が低く単結晶が得られないため，結晶構造は未解明であったが，2015 年になって，Ellisら 13) の多角的なアプローチによる研究で，Nd 3＋と HDEHP の配位高分子の結晶が 1 次元の鎖構造( Fig. 1(E)…”

unclassified

Unusual Lanthanide Ion Exchange Selectivity in Phosphoester Coordination Polymers

Tasaki-Handa

2019

J.I.E.

View full text Add to dashboard Cite

Ion exchange properties in coordination polymers based on phosphoesters were investigated. The ion-exchange selectivity of [Ce(dehp) 3 ], formed by Ce 3＋ and di(2-ethylhexyl phosphoric acid), is in the order Nd 3＋＜ Gd 3＋＜ Dy 3＋＜ Lu 3＋ when a small amount of Ln 3＋ is loaded, but Lu 3＋ ≈ Nd 3＋＜ Gd 3＋ ≈ Dy 3＋ for a high loading ratio. It is experimentally suggested that a steric effect is involved in the reactions, which becomes stronger for the smaller Ln 3＋ , in addition to a simple electrostatic interaction. This trend is attributed to the differences in the ionic sizes between an original Ce 3＋ and an incoming Ln 3＋. Coordination polymers are candidates for a new type of ion-exchange material of which properties are different both from inorganic and organic ion-exchange materials.

show abstract