The crystal structures of the ternary compounds Tb 0.67 PdAl 3 (hP14-4.67, P6 3 /mmc, a = 4.394(4), c = 9.372(6) Å) and Gd 1.33 Pt 3 Al 8 (hR51-14.00, R m, a = 4.3090(14), c = 38.54(2) Å) were refined from X-ray single-crystal diffraction data. They contain monoatomic layers stacked along [001] with ordered or disordered distribution of rare-earth-metal atoms and Al-atom triangles. Together with the structures of Y 2 Co 3 Ga 9 , Sc 0.67 Fe 2 Si 5 , Er 4 Pt 9 Al 24 , and ErNi 3 Al 9 , they form a family of intergrowth structures built up of three kinds of monoatomic layer. Analyzing the relative positions of the monoatomic layers, some basic stacking rules, which may help to predict new structures, are formulated. Aluminide / Rare-earth metal / Noble metal / Single-crystal X-ray diffraction / Intergrowth layered structure
N,N,N,N',N'-pentaallylethylenediammonium has been obtained by reaction of ethylenediamine and allyl bromide in benzene +ethanol (1:5) medium in the presence of NaHCO 3. After 48 hours of mixing and boiling the mixture was filtered. Good quality crystals of the complexes [(C 3 H 5) 3 NC 2 H 4 N(H +)(C 3 H 5) 2 ]Cu II Cl 4 (I) and [(C 3 H 5) 3 NC 2 H 4 N(H +)(C 3 H 5) 2 ]Cu I Br 3 (II) were obtained using the alternating-current electrochemical technique and then X-ray investigated. The crystal structures of I and II are monoclinic, for I: space group
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