The compounds [PtMe2(Ph2PCH2CH2CHCH2)] and [PtMe2(Me2AsCH2CH2CHCH2)] have been synthesized and their structures have been determined by single-crystal X-ray diffraction. The square-planar complexes have bidentate butenyl-phosphine or butenylarsine ligands. The bonding is discussed in the light of the observed data.

Abstract2,6‐Diformylpyridine (IV), prepared as shown, yields in a template reaction with o‐phenylenediamine and barium ions the complex (VI) which gives the title complexes (VIII) by ligand‐transfer reactions.

Complexes of lanthanide nitrates and perchlorates with a hexadentate triamine-triether macrocyclic ligand L have been obtained either by template synthesis for La and Ce or by metal ion transfer for Nd and Sm. IR, NMR, mass spectra, and cyclic voltammograms are discussed. The X-ray crystal structure of [La(NO3)3L] shows 12-coordinated La with LaO (nitrate)= 2.653–2.752 Å, LaO (macrocycle) = 2.634–2.781 Å, and LaN (macrocycle) = 2.680–2.755 Å.

The complexes (UCl3)3(benzo-15-crown-5)2, UCl3(cylohexyl-15-crown-5), (UCl3)3(18-crown-6)2 (UCl3)5(dibenzo-18-crown-6)3, (UCl35(cis-syn-cis- dicyclohexyl-18-crown)3, UCl3(1,10-phenanthroline)2 and UCl3(2,2″-bipyridyl)2 have been prepared by zinc amalgam reduction of acetonitrile or acetonitrile/propionic acid solution of UCl4 and the appropriate ligands. Reduction by sodium hydride was also used in one case. The complexes are brown, red, or purple solids which are oxidized in a air and are insoluble in those common organic solvent with which they do not react. Electronic spectra were obtained by reflectance in the range 350–1500 nm, and magnetic susceptibilities of the crown ether complexes at 298 K in the range 2.72–2.91 BM.

AbstractDie Titelverbindungen werden durch Umsetzung von Eu‐dichlorid mit einem Überschuß an Phenanthrolin oder Tripyridyl‐in Acetonitril dargestellt (Ausb. 7 5‐100%).

AbstractDurch Reaktion hydratisierter Lanthanoidnitrate mit dem Kronenether in Aceton werden in Abhängigkeit von der Temp. und der Kristallisationsperiode drei Typen von Komplexen (I)‐(III) in 70‐80% Ausb. erhalten.

The template condensation of 2,6-diacetyl-pyridine with ethylenediamine gives complexes [M(NO3)3L](M = La or Ce) of the hexadentate nitrogen donor macrocycle L; the structure of [La(NO3)3L] has been determined by X-ray diffraction, and the complexes, whose 1H n.m.r. spectra are described, are kinetically stable in water with respect to dissociation of the macrocycle.

AbstractDer Titelligand wird erhalten durch Hydrogenierung von Dibenzo‐18‐crown‐6 in n‐Butanol bei 100 atm und 135°C unter Verwendung von 5% Ru an Al2O3 als Katalysator.

An X-ray crystal structure determination shows that the complex cations in [La(NO3)2{N(CH2CH2OCH2CH2OCH2CH2)3N}]3[La(NO3)6] contain a lanthanum ion co-ordinated to eight cryptate donor atoms together with two bidentate nitrate ions, the cryptate ligand being somewhat distorted to accommodate the latter.

AbstractTris‐[bis‐(trimethylsilyl)‐amido]‐La, ‐Lu und ‐Eu bilden bei der 1:1‐molaren Umsetzung mit Triphenylphospinoxid in Benzol unter anaeroben Bedingungen die tetraedrischen 1:1‐Addukte (I).

A single-crystal X-ray study of trinitrato-cis,syn,cis-2,5,8,15,18,21-hexaoxatricyclo[20,4,0, 09,14]hexacosanelanthanum shows the metal ion to be co-ordinated to six polyether oxygen atoms and three bidentate nitrate ions; structural parameters are discussed.

Application of Job's method to the visible spectra of adducts of tris(2,2,6,6-tetramethylheptane-3,5-dionato)-holmium in carbon tetrachloride shows that 1:1 adducts are formed with stability constants which vary considerably with the nature of the added ligand.

Fluorescence spectra of the n.m.r. shift reagent tris(2,2,6,6-tetramethylheptane-3,5-dionato)europium(III) and some of its adducts are reported and deductions made regarding equilibria and conformations in solution.

Although the first σ-bonded organolanthanides were not fully characterized for some 20 years after the isolation of the first π-cyclopcntadienyls, a wide range of these compounds is unfolding. The review discusses synthetic routes to the compounds, both with and without “supporting” polyhapto ligands and including the very recent carbenes, exploring the principles behind their isolation. Structural information is critically reviewed, with the effects of bulky ligands and the lanthanide contraction considered.

AbstractDie silylierten Amide (II) reagieren mit überschüssigem Triphenylphosphinoxid (I), das durch Hydrolyse von Triphenyldibromphosphoran erhalten wird, in Benzol zu den Peroxoverbindungen (III).