¹⁹⁵Pt–³¹P nuclear spin coupling constants and the nature of the trans-effect in platinum complexes

Abstract

on a wide range of couplings has shown that consistent results are often obtained if A W is regarded as being constant within a series of similar compounds. The terms involved in A E are singlet-to-triplet excitation

Propellanes LXXIX. Comparison of the geometries of dithia[n.3.3]propellanes (n = 1, 2, 3) and dithia(and oxathia)[4.3.3]propellanes. Study of the influence of complexation with HgCl2, I2, CdCl2 and PdCl2 and of formation of sulfoxides on some of these compounds. Demonstration of the 'Klammer' effect. Structures of eighteen crystals

“…The trans effect is the effect of a coordinated group A upon the rate of the substitution reaction of the group opposite to A. Thus the trans influence depends on thermodynamic factors and the trans effect on kinetic factors; this distinction was first introduced by Pidcock, Richards & Venanzi (1966). Karapetyan, Struchkov & Dvoryantseva, 1982).…”

13C Nuclear Magnetic Resonance Studies of Organometallic Compounds. V. Di- and Trimethylplatinum(IV) Derivatives

“…ic resonance spectroscopy has provided important new information concerning the nature of the bonding in simple o-bonded platinum(I1) derivatives (1)(2)(3)(4). From studies of three series of \ * -trans-methylplatinum(I1) complexes (2), we presented evidence which firmly supports the rehy-where L and L' are neutral ligands and R alld X bridization theory of the trans-influence (5)(6)(7). ln are anionic substituents.…”

Organometallphosphin-substituierte Übergangsmetallkomplexe, XIX [1] Carbonyl-dinitrosyl-organometallphosphin-eisen-Komplexe / Organometalphosphine-substituted Transition Metal Complexes, XIX [1] Carbonyl Dinitrosyl Organometalphosphine Iron Complexes

“…Dicarbonyl-dinitrosyl-eisen reagiert mit äquimo-" laren Mengen Tri-ferf-butylphosphin (1), T>\(tertbutyl)-trimethylsilylphosphin (2), -trimethylgermylphosphin (5), -trimethylstannylphosphin (8), £er£-Butyl-bis(trimethylsilyl)phosphin (3), -bis(trimethylgermyl)phosphin (6), -bis(trimethylstannylphosphin (9), Tris(trimethylsilyl)phosphin (4), Tris-(trimethylgermyl)phosphin (7) und Tris (trimethylstannylphosphin (10) in Tetrahydrofuran bei Raumtemperatur unter Abspaltung einer COGruppe und Bildung der organoelement(IVb)phosphin-substituierten Carbonyldinitrosyl-eisen-Komplexe la-10a, die als braunrote Kristalle isoliert werden können: M Si Ge Sn…”

“…II, (53(K), 08(10, Während es bisher nicht möglich war, für Dicarbonyl-dinitrosyleisen und dessen Derivate Kernresonanzsignale des einzigen magnetisch aktiven Eisenisotops 57 Fe (Kernspin I = 1/2) zu erhalten [7], gelang es uns in den 31 P-NMR-Spektren aller zehn Komplexe ein, das Hauptsignal flankierendes Satellitenpaar eindeutig der Kopplung 1 J( 31 P 57 Fe) zuzuordnen und den jeweiligen Wert der Kopplungskonstanten zu ermitteln (Tab. II, J3)• Nach Pople und Santry ist die Größe der Kopplungskonstanten J zweier benachbarter Kerne hauptsächlich durch den ,,Fermi-Kontakt-Term" bestimmt, der in vereinfachter Form durch Gleichung (5) beschrieben wird [8,9]:…”