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11
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15144357159
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-
note
-
1/2. / is the intensity, and σ(I) is its estimated standard deviation.
-
-
-
-
12
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-
15144358769
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-
note
-
3, Z = 4.
-
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13
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0000823903
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R. K. McMullan, J. Epstein, J. R. Ruble, B. M. Craven, Acta Crystallogr. Sect. B 35, 688 (1979).
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J. de Meulenaer and H. Tompa, Acte Crystallogr. 19, 1014 (1965); L K. Templeton and D. H. Templeton, Abstr. Am. Crystallogr. Assoc. Meeting (Storrs, CT) (1965), p. 143.
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16
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15144354903
-
-
note
-
Because of the extremely small size (by neutron diffraction standards) of the crystal, we found it necessary to collect data very slowly (approximately 150 reflections per day), and the data set was quite weak. Consequently, the agreement factor is somewhat higher than normally expected. Distances and angles quoted in this report are based on the refinement with all data. A complete set of supplementary tables for this structure analysis, including atomic coordinates, interatomic distances and angles, has been deposited with the Cambridge Crystallographic Data Centre (UK) as CCDC-100105.
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-
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17
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0037579095
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Spec. Publ. 18, Chemical Society, London
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Interatomic Distances Supplement (Spec. Publ. 18, Chemical Society, London, 1965), p. S10s.
-
(1965)
Interatomic Distances Supplement
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18
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0039256447
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6-H [F. Lutz et al., Inorg. Chem. 35, 2698 (1996)].
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Lutz, F.1
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19
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15144344204
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note
-
In the original x-ray work (5, 6), it was predicted that the first H atom would be found in the unique cavity bridged by one CO ligand [Rh(1,3,4,5,13)], and the second H atom in one of the cavities bridged by two CO groups [Rh(8,9,10,12,13)].
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-
-
20
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0000692049
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-
In our neutron analysis, the eight surface Rh-Rh distances of the two occupied cavities, Rh(1,3,4,5) and Rh(8,9,10,12), average to 2.78(1) Å, whereas the 16 surface Rh-Rh distances of the four unoccupied cavities average to 2.75(1) Å. This represents a 1% expansion in the dimensions of filled holes relative to empty holes and is consistent with (but smaller than) the 2 to 3% expansion deduced from earlier x-ray work (6). Studies on the binary Rh-H system also support an increase in metal-metal distance upon occupation of a cavity by H, with expansions typically in the 5% range [see S. Wilke, D. Hennig, R. Löber, Phys. Rev. B 50, 2548 (1994)].
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Phys. Rev. B
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Wilke, S.1
Hennig, D.2
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22
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0001931782
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K. Christmann, Prog. Surf. Sci. 48, 15 (1995); Mol. Phys. 66, 1 (1989).
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-
-
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23
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15144348087
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note
-
3-H) and Rh-H distances ranging from 1.84(1) to 1.86(1) Å (21).
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-
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24
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0009621101
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W. Oed et al., J. Phys. C 21, 237 (1988); K. Lehnberger, W. Nichtl-Pecher, W. Oed, K. Heinz, K. Müller, Surf. Sci. 217, 511 (1988); E. Kirsten, G. Parschau, K. H. Rieder, Chem. Phys. Lett. 181, 544 (1991); G. Parschau, E. Kirsten, K. H. Rieder, Phys. Rev. B 43, 12216 (1991); K. Christmann, M. Ehsasi, W. Hirshwald, J. H. Block, Chem. Phys. Lett. 131, 192 (1986).
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J. Phys. C
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Oed, W.1
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25
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4243863532
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W. Oed et al., J. Phys. C 21, 237 (1988); K. Lehnberger, W. Nichtl-Pecher, W. Oed, K. Heinz, K. Müller, Surf. Sci. 217, 511 (1988); E. Kirsten, G. Parschau, K. H. Rieder, Chem. Phys. Lett. 181, 544 (1991); G. Parschau, E. Kirsten, K. H. Rieder, Phys. Rev. B 43, 12216 (1991); K. Christmann, M. Ehsasi, W. Hirshwald, J. H. Block, Chem. Phys. Lett. 131, 192 (1986).
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Lehnberger, K.1
Nichtl-Pecher, W.2
Oed, W.3
Heinz, K.4
Müller, K.5
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26
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0040160663
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W. Oed et al., J. Phys. C 21, 237 (1988); K. Lehnberger, W. Nichtl-Pecher, W. Oed, K. Heinz, K. Müller, Surf. Sci. 217, 511 (1988); E. Kirsten, G. Parschau, K. H. Rieder, Chem. Phys. Lett. 181, 544 (1991); G. Parschau, E. Kirsten, K. H. Rieder, Phys. Rev. B 43, 12216 (1991); K. Christmann, M. Ehsasi, W. Hirshwald, J. H. Block, Chem. Phys. Lett. 131, 192 (1986).
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Kirsten, E.1
Parschau, G.2
Rieder, K.H.3
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27
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1542679947
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W. Oed et al., J. Phys. C 21, 237 (1988); K. Lehnberger, W. Nichtl-Pecher, W. Oed, K. Heinz, K. Müller, Surf. Sci. 217, 511 (1988); E. Kirsten, G. Parschau, K. H. Rieder, Chem. Phys. Lett. 181, 544 (1991); G. Parschau, E. Kirsten, K. H. Rieder, Phys. Rev. B 43, 12216 (1991); K. Christmann, M. Ehsasi, W. Hirshwald, J. H. Block, Chem. Phys. Lett. 131, 192 (1986).
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Phys. Rev. B
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Parschau, G.1
Kirsten, E.2
Rieder, K.H.3
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28
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15144347720
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W. Oed et al., J. Phys. C 21, 237 (1988); K. Lehnberger, W. Nichtl-Pecher, W. Oed, K. Heinz, K. Müller, Surf. Sci. 217, 511 (1988); E. Kirsten, G. Parschau, K. H. Rieder, Chem. Phys. Lett. 181, 544 (1991); G. Parschau, E. Kirsten, K. H. Rieder, Phys. Rev. B 43, 12216 (1991); K. Christmann, M. Ehsasi, W. Hirshwald, J. H. Block, Chem. Phys. Lett. 131, 192 (1986).
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D. R. Hamann and P. J. Feibelman, Phys. Rev. B 37, 3847 (1987); P. J. Feibelman and D. R. Hamann, Surf. Sci. 234, 377 (1990); P. J. Feibelman, Phys. Rev. B 43, 9452 (1991); D. Hennig, S. Wilke, R. Löber, M. Methfessel, Surf. Sci. 287-288, 89 (1993).
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Hydrogen in Metals, G. Alefeld and J. Völkl, Eds., Springer-Verlag, New York
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12 jumps per second for the diffusivity of H in V at room temperature [see J. Völkl and G. Alefeld, in Hydrogen in Metals, G. Alefeld and J. Völkl, Eds., vol. 28 of Topics in Applied Physics (Springer-Verlag, New York, 1978), p. 321]. Moreover, the mobility of H in metals is known to be about 15 to 20 orders of magnitude greater than those of heavier interstitials such as N or O.
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Völkl, J.1
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24]3-, however, does not persist at low temperature in solution (-95°C) (8), nor does it occur in the solid state [T. Eguchi et al., J. Chem. Soc. Dalton Trans. 1996, 625 (1996)].
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J. S. Ricci, T. F. Koetzle, R. J. Goodfellow, P. Espinet, P. M. Maitlis, ibid. 23, 1828 (1984).
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42
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15144353332
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note
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This research was supported by NSF grant CHE-9421769, American Chemical Society grant PRF-29196-AC3, Research Corporation grant R-171, and NATO grant CRG-921317. The neutron diffraction study was carried out at Brookhaven National Laboratory under contract DE-AC02-76CH00016 with the Department of Energy and supported by its Office of Basic Energy Sciences. We thank K. Koehler III for technical assistance with the neutron data collection.
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