Oxidizing noble metals: Pure N2O5 can oxidize elemental gold and palladium. The complex nitrates obtained by these reactions, (NO)[Au(NO3)4], (NO)2[Pd(NO3)4], and also the first nitrate of tetravalent platinum, (NO)2[Pt(NO3)6] (see picture for the anion: Pt gray, N green, O blue), have the potential to act as precursors owing to their high thermolability. The thermal decomposition of (NO)[Au(NO3)4] was elucidated in detail by several methods.

Yellow single crystals of (NO 2 )[Au(NO 3 ) 4 ] (monoclinic, P2 1 /n, Z ) 2, a ) 775.1(2) pm, b ) 810.2(2) pm, c ) 898.7(2) pm, β ) 112.67(3)°, wR2 ) 0.0622) were obtained from the reaction of elemental gold with N 2 O 5 . In the crystal structure complex [Au(NO 3 ) 4 ]ions are present with the Au 3+ ions being in square planar coordination of four oxygen atoms of just as many monodentate nitrate groups. Charge compensation is achieved by linear NO 2 + ions. (NO 2 )[Au(NO 3 ) 4 ] decomposes between 363 and 423 K in a complex process yielding elemental gold. Solutions of (NO 2 )[Au(NO 3 ) 4 ] in N 2 O 5 were used to build contamination free structures of elemental gold onto a silica surface by electron beam initiated decomposition of the compound.

Objective: Internet-based guided self-help (GSH-I) is an efficacious treatment for adults with binge-eating disorder (BED) and overweight or obesity. Although broadly accessible, high dropout from GSH-I has been reported. However, little is known about the factors explaining dropout from GSH-I, including patients' adherence to treatment.Method: Within a randomized trial on the treatment of BED, adherence to 4-month GSH-I was objectively assessed in N = 89 patients with BED and overweight or obesity. Objective adherence and subjective treatment evaluation were evaluated as predictors of dropout from GSH-I, defined as having accessed 5 or less of 11 modules.Cutoffs with optimal sensitivity and specificity were derived using Receiver Operating Characteristics curves analysis, and baseline sociodemographic and clinical correlates were determined.Results: According to our definition, n = 22 (24.7%) patients were defined as dropouts. Results of the full logistic regression model accounted for 72% of the variance in dropout and all objective adherence parameters (i.e., number of messages exchanged, days with a completed food diary, and days spent per module), but not patients' subjective GSH-I evaluation significantly predicted dropout. Specifically, not completing the food diary in week 7 had maximized sensitivity and specificity in predicting dropout. Patients' body mass index was positively associated with the number of messages exchanged between patients and coaches. No other associations between baseline variables and objective adherence were found.Martina de Zwaan and Anja Hilbert contributed equally to this study.

Mit reinem N2O5 können die Edelmetalle Au und Pd problemlos oxidiert werden. Es bilden sich die komplexen Nitrate (NO)[Au(NO3)4] und (NO)2[Pd(NO3)4], die ebenso wie das erste bekannte Nitrat von PtIV, (NO)2[Pt(NO3)6], wegen ihrer thermischen Labilität mögliche Vorstufen für die Edelmetalle sind (das Bild zeigt [Pt(NO3)6]2−; grau Pt, grün N, blau O). Für (NO)[Au(NO3)4] konnte der thermische Abbau mithilfe mehrerer komplementärer Methoden aufgeklärt werden.

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