Phosphorus phosphorus compounds with the coordination number 4
01 Jan 1977-pp 90-110
About: The article was published on 1977-01-01. It has received None citations till now. The article focuses on the topics: Phosphorus.
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TL;DR: In this paper, the 1H, 31 P NMR, mass, IR, FIR and Raman spectra of the S- and P-isomeric complexes are discussed in detail.
28 citations
TL;DR: In this paper, a quasicyclic structure of the tetraphosphide M2(PR)4 (M = K, Na) was shown to be compatible with a configuration rule for five-membered phosphanes which describes the relation of magnitudes of cis and trans-2JPP couplings.
Abstract: Die Organyl-tetraphosphide M2(PR)4 (M = K, Na) und sehr wahrscheinlich auch die entsprechenden Triphosphide M2(PR)3 liegen in einer quasicyclischen Konformation mit zweifacher intramolekularer Metallbrucke zwischen den endstandigen P-Atomen vor. Diese Struktur ergibt sich auf Grund folgender 31P-NMR-spektroskopischer Befunde fur die Tetraphosphide: Die Salze M2(PR)4 (M = K, Na) treten jeweils nur in Form eines einzigen Konfigurationsisomers auf, was auf eine konfigurationsselektierende „Cyclisierungsreaktion” schliesen last. Daruber hinaus haben die 2JPP-Kopplungskonstanten die gleiche Grosenordnung wie in funfgliedrigen Heterocyclophosphanen. Ferner weisen die 3JPP-Kopplungen zwischen den „endstandigen” P-Atomen ungewohnlich grose Werte auf. Die alternative monocyclische Struktur mit einfacher Metallbrucke ist mit einer fur Funfring-Phosphane charakteristischen Konfigurationsregel, die sich auf die Grosenrelation der cis- und trans-2JPP-Kopplungen bezieht, nicht vereinbar.
Contributions to the Chemistry of Phosphorus. 64. About the Quasicyclic Conformation of the Organylphosphides M2(PR)n′[M = K, Na]
The organyl tetraphosphides M2(PR)4 (M = K, Na) and – as can be assumed with a high probability – the corresponding triphosphides M2(PR)3 exhibit a quasicyclic conformation with a twofold intramolecular metal bridge between the terminal P atoms. This structure becomes evident from the following 31P n.m.r. spectroscopic observations for the tetraphosphides: For the salts M2(PR)4 (M = K, Na) only a single configuration isomer is observed indicating that a configuration selecting “cyclization reaction” takes place. Beyond it, the 2JPP coupling constants have the same range of magnitude as in five-membered heterocyclophosphanes. Moreover, the 3JPP couplings between the “terminal” P atoms possess unusual high values. The alternative monocyclic structure with a single metal bridge is not compatible with a configuration rule for five-membered phosphanes which describes the relation of magnitudes of cis- and trans-2JPP couplings.
26 citations
TL;DR: The phosphazenes [NP(NHMe)2]n, [NP[NPMe]2]4, and [NPMe 2]4 as mentioned in this paper react with K2PtCl4 in organic media to yield square-planar Pt complexes of the type (NPR2)x PtCl2, and in aqueous acid medium to yield salts of the kind, [H2N4P4R8]2+[PtCL4]2−]
Abstract: The phosphazenes [NP(NHMe)2]n, [NP(NHMe)2]4, and [NPMe2]4, react with K2PtCl4 in organic media to yield square-planar Pt complexes of the type (NPR2)x PtCl2, and in aqueous acid media to yield salts of the type, [H2N4P4R8]2+[PtCl4]2–; moreover, these compounds have shown significant antitumour behaviour in preliminary testing
25 citations
TL;DR: In this article, a tautomeric equilibrium for secondary phosphane sulfides (R 2 HPS) and thiophosphinic acids (R2 PSH) on carbonyl(halogen)manganese systems was formulated.
25 citations
24 citations