The measurement of¹J(¹⁸⁷Os–³¹P)

Abstract

The first measurement of 1J(1e7Os-3lP) is reported for the complexes OsH,(PEt,Ph), and cis-OsCl,(CO),-(PButPrn,),.increase in lK(M-slP) . , consistent with the expected increase in s-electron density a t the nucleus from tungsten to platinum causing the ALTHOUGH osmium has a naturally occurring isotope with nuclear spin of one half (1870s, 1.64% abundant), hitherto the only observation of nuclear spin-spin coupling to osmium has been osmium-hydrogen coupling in multihydrido-complexes such as OsH,(AsEt,Ph) ,.I We now report the first measurement of lJ(187OsSlP). The 3 1 P n.m.r. spectra of OsH,(PEt,Ph) , and cis-OsCl,(CO),-(PButPrn,), were measured with white noise decoupling of the protons. The results are summarised in the Table, along with data for comparison for tungsten and platinum.It will be observed that for compounds of similar type the reduced coupling constant, lK(M-SlP), for 1870.5 is intermediate between the value for la3W and 195Pt. This is J(M-31P) and lK(M31P) for some third-row transition metal complexes 'K(M-"P) x J ( M 3 P ) Hz 10-20 cn13 * W-P Complexes2 * . . . 200-381 994-1894 trans-W(CO),(PBun,), .. 265 1317 OsH,(PEt2Ph), . . .. 166 1490 cis-0sCl2(CO),(PButPrn~)6 . . 149.8 1343 tr~ns-PtC1~(PButPr~,)~ 4 .. 2435 2343 Pt-P Complexes2 .. .. 1460---6400 1405-6158 * K(N-N') = J(N-N')*~~/L(YNYN.)*'

RuS4Cl12 und Ru2S6Cl16, zwei neue Ruthenium(II)-Komplexe mit SCl2-Liganden

“…den beiden zweikernigen Gruppen Ru 2 Cl 10 und Ru 2 Cl 9 durch Substitution von Chlorid durch den Neutralliganden SCl 2 ableiten: [10,11], die analog zum Anion [RuCl 3 (SCl 2 ) 3 ] ± von 1 sind. Ein zu 2 analoger Chlorokomplex Ru 2 Cl 4 L 6 mit den Liganden CO und P(tBu) 2 Ph besitzt nach IR-, Raman-und 1 H-NMR-Messungen ebenfalls eine zentrosymmetrische Struktur [12].…”

Adp‐Ribosylation of Guanyl Nucleotide‐Binding Regulatory Proteins by Bacterial Toxins

“…The delay in activation of adenylate cyclase by choleragen in intact cells may be due in part to the time necessary for the multivalent binding of toxin and lateral movement of the toxin-ganglioside complex to form aggregates on the cell surface (358,387,(399)(400)(401). It has been proposed that patching and capping promote internalization of the toxin (361,372,400,(402)(403)(404)(405).…”

Purification and properties of calf thymus polyadenosine diphosphate ribose polymerase

“…In fact, the first activity detected in the chicken liver was isolated with particulate fractions of nuclear extracts [1 ]. The solubilized enzyme fraction was obtained by DNAase treatment [ 19], NaC1 extraction and centrifugation [30], CsC1 gradient centrifugation [20], and (NH4)2SO4 extraction [23]. We have examined DNAase treatment and NaC1 extraction to solubilize poly(A)DPR polymerase.…”