Observations on the rare earths—LXXII The preparation and characterization of anhydrous and n,n-dimethylformamide-solvated acetates

Ring-opening polymerization of lactone and lactide have been initiated with rare earth organoacid compounds, such as lanthanum acetate in bulk. The polymerization mechanism is in agreement with the "nonionic-coordination-insertion" mechanism, which involves the selective cleavage of the acyl-oxygen bond of the monomer. These organoacid rare earth initiators can give high yield of medium to high molecular weight products. An interesting aspect of this investigation is the good agreement between the performance of the initiator and the solubility of the initiator in the monomer. However, the relatively slow initiation step makes it difficult to control the molecular weight and results in a broad molecular weight distributions.

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Pr(CH₃COO)₃, ein wasserfreies Selten‐Erd‐Acetat mit Netzwerkstruktur

Lossin

Meyer

1994

Zeitschrift anorg allge chemie

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Pr(CH3COO)3 entsteht beim Entwässern von Pr(CH3COO)3 · 1,5 H2O bei 180°C als amorphes Pulver. Einkristalle konnten daraus mit Hilfe von (NH4)CH3COO als „Mineralisator”︁ ebenfalls bei 180°C in einer geschlossenen Glasampulle gezüchtet werden. Die Kristallstruktur (tetragonal, P421c (Nr. 114), Z = 24, a = 2106,5(3), c = 1323,6(1) pm, Vm = 147,39(3) cm3/mol, R = 0,055, Rw = 0,029) wurde anhand von Vierkreis‐Diffraktometerdaten bestimmt. Pr3+‐Ionen besetzen drei unterschiedliche kristallographische Positionen und sind von 9 bzw. 10 Sauerstoffatomen umgeben. Acetationen verbinden die Kationen auf unterschiedliche Weise zu einem komplizierten dreidimensionalen Netzwerk.

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Observations on the rare earths—LXXII The preparation and characterization of anhydrous and n,n-dimethylformamide-solvated acetates

Cited by 23 publications

References 5 publications

Some Substitution Reactions of Cobalt(III) Complexes in N,N-Dimethylformamide and Mixed Solvents

Some Substitution Reactions of Cobalt(III) Complexes in N,N-Dimethylformamide and Mixed Solvents

Polymerization of lactides and lactones. II. Ring-opening polymerization of ?-caprolactone andDL-lactide by organoacid rare earth compounds

Pr(CH₃COO)₃, ein wasserfreies Selten‐Erd‐Acetat mit Netzwerkstruktur

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Observations on the rare earths—LXXII The preparation and characterization of anhydrous and n,n-dimethylformamide-solvated acetates

Cited by 23 publications

References 5 publications

Some Substitution Reactions of Cobalt(III) Complexes in N,N-Dimethylformamide and Mixed Solvents

Some Substitution Reactions of Cobalt(III) Complexes in N,N-Dimethylformamide and Mixed Solvents

Polymerization of lactides and lactones. II. Ring-opening polymerization of ?-caprolactone andDL-lactide by organoacid rare earth compounds

Pr(CH3COO)3, ein wasserfreies Selten‐Erd‐Acetat mit Netzwerkstruktur

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Product

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Pr(CH₃COO)₃, ein wasserfreies Selten‐Erd‐Acetat mit Netzwerkstruktur