α‐Platinum(II) Chloride and Platinum(III) Chloride

Abstract

tations, while those with inorganic electron acceptors (except 0 2 ) are described as anaerobic respiration. Respiration occurs when oxygen acts as the terminal oxidant. Terms such as "fumarate respiration" and "inorganic fermentation" are incompatible with this view.A self-consistent definition of the basic metabolic types, i. e. fermentation, respiration, and photosynthesis, is provided by the relation of electron donor and acceptor systems on the one hand and the ATP* synthesizing pathways on the other (Table 1). In fermentations, ATP* is formed by substrate level phosphorylation only, whereas cell respiration is a redox process in which ATP* is synthesized mainly by electron transport phosphorylation. Photosynthesis is dominated by light-driven electron transport phosphorylations. COMMUNICATIONSInorganic fermentafion would thus be a redox process with a n inorganic electron acceptor, in which ATP* is formed exclusively by substrate level phosphorylation. Anaerobic respiration is an oxygen-free energy metabolism with an ATP* synthesis coupled to electron transport.

Structure and Bonding of the Mixed‐Valent Platinum Trihalides, PtCl3 and PtBr3

“…Platinum halides PtX 2 , PtX 3 and PtX 4 (X ϭ Cl, Br) were synthesized and described by Wöhler ago [1Ϫ3]. However, single crystals of the dark-red PtBr 3 and the dark-green PtCl 3 were grown by Thiele and Woditsch [4] and by Wiese et al [5] for the first time in 1969 and 1970, respectively. The trihalides are isotypically and represent the first structural proof of the existence of distinct mixed-valent states with platinum (Pt II / Pt IV ) [4,5].…”

“…However, single crystals of the dark-red PtBr 3 and the dark-green PtCl 3 were grown by Thiele and Woditsch [4] and by Wiese et al [5] for the first time in 1969 and 1970, respectively. The trihalides are isotypically and represent the first structural proof of the existence of distinct mixed-valent states with platinum (Pt II / Pt IV ) [4,5]. The former structure determinations based on X-ray film data [4] and 2-circle diffractometer (Philips PAILRED) data [5,6], which don't allow a more sophisticated analysis of the structural arrangement.…”

“…The trihalides are isotypically and represent the first structural proof of the existence of distinct mixed-valent states with platinum (Pt II / Pt IV ) [4,5]. The former structure determinations based on X-ray film data [4] and 2-circle diffractometer (Philips PAILRED) data [5,6], which don't allow a more sophisticated analysis of the structural arrangement. Furthermore, the mean bond lengths Pt IV ϪCl a and Pt IV ϪCl b listed in [5] are exchanged by mistake.…”

“…The former structure determinations based on X-ray film data [4] and 2-circle diffractometer (Philips PAILRED) data [5,6], which don't allow a more sophisticated analysis of the structural arrangement. Furthermore, the mean bond lengths Pt IV ϪCl a and Pt IV ϪCl b listed in [5] are exchanged by mistake. A redetermination of both structures seems to be necessary to obtain reliable details with respect to possible transitions into the Pt III state as observed with PtI 3 [7].…”

Binary halides of platinum: Preparations, thermal decomposition and structural results

“…As these authors suggest, this sample may indeed have been an ~-PdCl2-type (22) modification [ Table 1, footnote (a), and ref. 23], but since they purified their samples by sublimation it seems to us that this is more likely to have been the modification* recently prepared by Sch/ifer et al (13) by tempering PttCll2 at ca. 500 °.…”