Articles you may be interested inTemperature dependence of interfacial fluctuations of polymerized fatty acid salt multilayers Sandwiches of monolayers of Cd salts of fatty acids CH3(CH2)n_2COOH of different chain lengths between metal electrodes show the exponential decrease of conductivity VB thickness predicted by the tunnel theory. The electron work function from metal to dielectric is obtained. The current-on-voltage dependence is predicted and it is found to be in good agreement with experiment. The effects of changing the electrode material are quantitatively predicted from the differences between the vacuum work functions of the metals used (Hg, AI, Pb, and Au), The good agreement between theory and experiment can be taken as an extremely sensitive test for the uniformity of the monolayers obtained by the monolayer assembling technique used in this investigation.

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.)*'

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