The thermal dehydration reactions of lanthanoid(III) malonate hydrates Ln2mal3·nH2O (Ln=Ce–Lu; mal=CH2(COO)2; n=6 for Ce–Eu and 8 for Gd–Lu) were investigated mainly by the thermogravimetries under conventional conditions and in atmosphere of water vapor at a constant reduced pressure and a superslow heating rate. The latter conditions were useful especially to detect the formation of new intermediate hydrates, and to determine the dehydration temperatures with accuracy. The main features of the results could be reasonably understood in view of the effects of the lanthanoid contraction.
Lanthanide chelates of some quinolinecarboxylic acids
作者:Alberto Seminara、Amelia Musumeci
DOI:10.1016/0022-1902(77)80572-1
日期:1977.1
The preparation of somelanthanide(III) tris and monobasic bis n-quinolinecarboxylates (n = 4, 6, 8) is reported. All compounds were characterized by elemental analysis and thermoanalytical and conductivity measurements. IR and electronic spectra are also presented, in comparison with the spectra of the corresponding lanthanide(III) 2-quinolinecarboxylates, in order to determine in such a way the ligands
Coordination chemistry of phosphoryl compounds — I
作者:J.T. Donoghue、David A. Peters
DOI:10.1016/0022-1902(69)80490-2
日期:1969.2
of analytical, conductivity and infrared spectral studies (HMPA = O = P[N(CH3)2]3). It has been found that the lanthanides exhibit the unusual coordination number of six in these compounds. Results also indicate that the ligand is coordinated via its phosphoryl oxygen atom.
已经制备了LnCl 3 -3HMPA类型的镧系元素的配合物,并通过分析,电导率和红外光谱研究(HMPA = O = P [N(CH 3)2 ] 3)进行了表征。已经发现,镧系元素在这些化合物中显示出不寻常的六配位数。结果还表明,配体通过其磷酰基氧原子配位。
Determination of the Mössbauer parameters of rare-earth nitroprussides: Evidence for new light-induced magnetic excited state (LIMES) in nitroprussides
Nitroprussides of the rare-earth elements and some mixed rare-earth-sodium nitroprussides are studied by Mössbauer spectroscopy at ambient and lower temperatures. The high precision Mössbauer measurements reveal fine changes in the electronic configurations of the nitroprusside anions. A small increase of the quadrupole splitting reveals charge polarization effects in the nitroprusside anion caused by the oblate
The tripositive lanthanide ions have been found to form a series of cation complexes of the type [Ln(HMPA)6] (ClO4)3, where HMPA is the ligand O P[N(CH3)2]3. The ligand was found to be coordinated to all metals studied via its phosphoryl oxygen. The analytical, i.r. and solution conductivity data may be interpreted in terms of a coordination number of six for all cases studied. Similarities and differences