Structure of bis(ethylenediamine)palladium(II) dichlorobis(ethylenediamine)palladium(IV) tetraperchlorate and remarks concerning the structures of analogous mixed-valence platinum compounds

Structure of a Pt(II)-Pt(IY) Mixed-Valence Linear Chain Complex: Bis (1,2-diaminopropane )platinum(II)bis (1,2-diaminepropane ) - dibromoplatinum(IV)tetraperchlorate

“…Though many further X-ray investigations have been carried out to resolve some of the problems [1,8] The controversial points involved arise from the "disorder" usually found in these solids. There are at least two different kinds of disorder which can occur in WSA:…”

Structure of the mixed-valence compound dipotassium tribromo(pyridine)platinate(II) pentabromo(pyridine)platinate(IV) dihydrate

“…This disordering is commonly observed in such compounds (Beauchamp et al, 1982). It was anticipated from the diffuse layer lines in the oscillation photographs, by the short chain axis (a = 5.6 A) and by the fact that the four Pt atoms in group Cmem have to be symmetrically equivalent.…”

“…Films were taken with two specimens which yielded the same results. The crystal used for intensity measurements had the dimensions: 0.043 [be_tween faces (001)and (00i)l × 0.003 [(010)and (010) The intensity data were recorded with an EnrafNonius CAD-4 diffractometer, following the procedure described previously (Beauchamp et al, 1982). A set of 651 independent hkl reflections (2t?…”

“…This effect manifests itself by weak diffuse layer lines, in addition to the normal Bragg lines, in oscillation photographs of the crystal rotating about the chain axis. Only a few examples of three-dimensionally ordered compounds have been proposed (Matsumoto, Yamishita, Ueda & Kida, 1978;Endres, Keller, Martin, Traeger & Novotny, 1980;Matsumoto, Yamashita & Kida, 1978), some of which have been criticized (Beauchamp et al, 1982). In addition to the halogen, the coordination sphere of Pt in the compounds studied so far usually contained NH 3 or small mono-of bidentate aliphatic amines.…”

Two crystalline modifications of dibromobis(1,2-diaminoethane)platinum(IV) bis(1,2-diaminoethane)platinum(II) tetrakis(perchlorate), [PtBr2(C2H8N2)2][Pt(C2H8N2)2](ClO4)4

“…The problems in elucidating X-ray structures of Wolffram's salt analogues (WSA's) have been manifold (Keller, 1982). Diffuse patterns, which make the choice of an unambiguous space group more difficult (Beauchamp, Layek & Theophanides, 1982), twinning (Cannas, Marongiu, Keller, Miiller & Martin, 1984) and chiral building blocks (Cannas, Marongiu, Martin & Keller, 1983) are among the difficulties recently discussed in detail. Some of the discrepancies could be resolved by observing the temperature dependence of the 'diffuse patterns' down to 4 K (Cannas, Marongiu, Martin & Keller, 1983;Cannas, Marongiu, Keller, Mfiller & Martin, 1984).…”