During this period final calculations were performed and the manuscript was prepared.Registry No. [Te(etu)4]Cl2-2H20, 63848-47-5.

Prussian Blue, Fe4[Fe(CN)6]3-x:H20 (x = 14-16), has been studied by powder neutron diffraction in four different states of hydration: dehydrated, x(H,D)2G with a vanishing scattering contribution of hydrogen, xD20, and xH20. Structural calculations using diffraction profile analysis reveal two structurally distinguishable kinds of water molecules. Six molecules of water are coordinated to Fe(III) at empty nitrogen sites; approximately eight additional water molecules are present either as isolated molecules at the center of the unit cell octants or as water molecules connected by hydrogen bonds to the coordinated ones. The corresponding O-D-O distance amounts to 2.87 Á. The disordered overall structure is described as a superposition of various ordered substructures. Magnetic contributions to the neutron intensities below the Curie temperature of 5.6 K reveal ferromagnetism. The magnetic part of the intensities corresponds to S' = 5/2 of high-spin Fe(III).

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Dark green-black crystals of [Ru(bpy),](PF,), (111) were obtained from [Ru(bp )3](PF6)2 (11) by oxidation with Mn02 in 7 M H2S04. The X-ray crystal structures of I11 (trigonal R k , a = 17.846 (7) 1, c = 19.915 (7) A, Z = 6) and I1 (trigonal P31c, u = 18.338 (7) A, c = 16.216 (13) A, Z = 6) were determined at 105 K. The low temperature structure of I1 shows the a-and b-axis increased by a factor of 47 relative to the room temperature structure and has three distinct Ru sites (phase transition at 190 ( 5 ) K). This explains many recent spectroscopic observations. The Ru-N distances of I1(2.053 (2) A) are virtually indistinguishable from those of I11 (2.057 (3) A). This is compatible with the high electron self-exchange rate between I1 and 111. The pattern of differences in intra-bpy bond lengths seems in contradiction to the conventional a-backbonding model. Changes of bpy distances in [M(bpy),], bpy, Hbpy', and H2bpy2+ are examined by a principal component analysis, which yields two main factors: The first factor is related to the temperature of measurement, the crystal packing pattern or the model used to interpret the diffraction data. The second factor can be characterized as electronic in nature and confirms that there are as yet unresolved contradictions in the model of a-backbonding as applied to the ligand geometry of [M(bpy),]"+ complexes.

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Abstract. The performance of a combined large aperture scintillometer (LAS) and a millimetre wave scintillometer (MWS) for estimating surface fluxes of sensible and latent heat over natural landscape is investigated, using data gathered during LITFASS-2003. For this purpose the LAS-MWS system was installed in a moderately heterogeneous landscape over a path length of 4.7 km with an effective beam height of 43 m. The derived surface fluxes have been compared with aggregated eddy-covariance (EC) measurements. The fluxes of sensible and latent heat from the LAS-MWS combination, as well as sensible heat fluxes of the single LAS, agreed fairly well with the EC-based fluxes, considering the uncertainties of the similarity stability functions and observed energy imbalance.

Contribution from the Institut für Anorganische Chemie and the Laboratorium für Kristallographie, Universitat Bern, Bern, Switzerland [(phen)2MnIV(/t-0)2Mnni(phen)2](PF6)3*CH3CN and [(phen)2MnIV(M-0)2MnIV(phen)2](a04)4-CH3CN (phen = 1,10-Phenanthroline): Crystal Structure Analyses at 100 K, Interpretation of Disorder, and Optical, Magnetic, and Electrochemical Results

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