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1Author    Edgar Niecke, Anke Nickloweit-Lüke, Reinhold Rüger, Bernt Krebs, Helmut GreweRequires cookie*
 Title    .2A 3 .3A 3 -Azadiphosphiridine -Synthese, Kristallstruktur und Eigenschaften 1,2 A 3 ,3 x 3 -Azadiphosphiridines -Synthesis, Crystal Structure and Proj)erties  
 Abstract    1,2 A 3 ,3 A 3 -Azadiphosphiridines are avaüable by elimination of hydrogenhalide from ß-and y-functional molecular frameworks and by 1 + 2 cycloaddition of phosphinidenes towards aminoiminophosphanes. In contrast to other three-membered phosphorus com-pounds, azadiphosphiridines decompose by 2 +1 cycloreversion to aminoiminophosphanes and phosphinidenes. The molecular structure of an azadiphosphiridine demonstrates the trans arrangement of the exocyclic ligands and the planarity of the endocyclic nitrogen. 
  Reference    Z. Naturforsch. 36b, 1566—1574 (1981); eingegangen am 13. Juli 1981 
  Published    1981 
  Keywords    Azadiphosphiridines, Cyclisation, Thermal Decomposition, NMR Spectra, Crystal Structure 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-1566.pdf 
 Identifier    ZNB-1981-36b-1566 
 Volume    36 
2Author    Schaffrath, R. GruehnRequires cookie*
 Abstract    Single crystals of the new oxochlorotantalate Nd 7 , 1 Ta 8 0 2H Cl f , could be obtained only by chemical transport reactions (T 2 —» T,; T 2 — 1000 °C, T, = 900 °C) with mixtures of Cl 2 /TaCl 5 as transport agent. NdTa0 4 was chosen as the starting material. A direct preparative route to Nd 7 ,,Ta s 0 2x Cl(, from binary and ternary components, however, was not successful. Nd 7 33 Ta H Oi x Clf, crystallizes in the space group Cmmm with a = 10.3381(8) Ä, b = 18.865(1) A, c — 3.9152(3) A; Z = 1. The structure was refined to R — 4.42%, R w = 2.76%. Main building units are pairs of edge-sharing Ta0 6 -octahedra which are connected with threefold capped trigonal prisms around Nd. Especially remarkable is one Nd position with an occupation factor of 0.833. The relationship of this new structure type with Nd 2 Ta 2 0 7 Cl 2 is considered. Furthermore, we have measured the magnetic susceptibilities of both Nd-compounds in a temperature range from 3,6 to 251,3 K. The results are compared with calculated data. 
  Reference    Z. Naturforsch. 43b, 1567—1574 (1988); eingegangen am 7. Juli 1988 
  Published    1988 
  Keywords    Oxochlorotantalates, Thermal Decomposition, Preparation, Chemical Transport Crystal Structure 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-1567.pdf 
 Identifier    ZNB-1988-43b-1567 
 Volume    43 
3Author    Hidenari Inoue3, Shuichi Narino3, Naoki Yoshioka3, Ekkehard FluckbRequires cookie*
 Title    Thermal Decomposition of Prussian Blue Analogues of the Type Fe[Fe(CN)5NO]  
 Abstract    The structure and properties o f the thermal decomposition products of Fe[Fe(CN)sNO] • x H2O (x = 5 ~ 6) have been studied by M össbauer and FT-IR spectroscopy, X-ray diffraction, and conductivity measurements. The valence state and coordination environment of the iron ions change dramatically when the nitrosyl ligand is eliminated by heat-treatment under vacuum at 200 °C. The dark blue product obtained by heat-treatment under vacuum at 250 °C is characteristic of the mixed-valence state in Prussian blue analogues. The electrical conductivity of the dark blue product is higher by a factor o f 103 than that o f the starting material because of the mixed-valence state between Fe(III)[Fe(II)(CN)5] and Fe(II)[Fe(III)(CN)5]. Heat-treatment under vacuum at 350°C yields a new product Fe(II)[Fe(II)(CN)4] the crystal structure of which is different from that of the starting material. The electrical conductivity of the decomposition product obtained at 350 °C is about 105 times higher than that of the starting material. 
  Reference    Z. Naturforsch. 55b, 685—690 (2000); received April 5 2000 
  Published    2000 
  Keywords    Prussian Blue Analogues, Mixed-Valence State, Thermal Decomposition 
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 TEI-XML for    default:Reihe_B/55/ZNB-2000-55b-0685.pdf 
 Identifier    ZNB-2000-55b-0685 
 Volume    55 
4Author    H. Oppermann, M. Zhang-PreßeRequires cookie*
 Title    Thermochemische Untersuchungen zu den Systemen SE203-Se02. II. Samariumselenoxide auf dem Schnitt Sm203-Se02 Thermochemical Investigations of Systems SE20 3-S e0 2. II. Samarium Selenium Oxides on the Line Sm20 3-S e 0 2  
 Abstract    The pure ternary phases on the line Sm2 0 3 -Se02: Sm2 Sev0 3 +2 V in thermodynamical equilibri­ um have been synthesizied by solid state reactions and characterized by X-ray powder diffrac­ tion, IR spectroscopy and DSC measurements. The existence of two new phases Sm2 Se, 5 0 6 and Sm2 Se4 O n was demonstrated besides the known phases Sm2 Se3 5 O 10, Sm2 Se3 0 9 and Sm2 S e0 5. The thermal decomposition properties of all compounds have been determined by total pressure measurements and the thermodynamical data of the compounds have been derived from their decomposition function and Cp-values. The phase diagram and the phase barogram have been estabilished using the results of DSC and total pressure measurements. 
  Reference    Z. Naturforsch. 56b, 917—926 (2001); eingegangen am 28. Mai 2001 
  Published    2001 
  Keywords    Samarium Selenium Oxides, Thermal Decomposition, Phase Diagram 
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 TEI-XML for    default:Reihe_B/56/ZNB-2001-56b-0917.pdf 
 Identifier    ZNB-2001-56b-0917 
 Volume    56 
5Author    I. Krabbes, H. LangbeinRequires cookie*
 Title    Herstellung von CuTa206 -von der Trirutil-zur Perowskit-Struktur Preparation o f CuTa20 6 -from the Trirutile to the Perovskite Structure  
 Abstract    A new trirutile MTa20 6 was synthesized by thermal decomposition of a freeze dried Cu-Ta-oxalate precursor. Its formation takes place preferentially starting from Cu-rich precursor compositions. Above 1000°C decomposition leads to the already known perovskite like structure with a composition Cuj .o.sTai 9S0 6 . The degree of the orthorhombic distortion of the perovskite unit cell depends on the conditions during the cooling process after perovskite formation. 
  Reference    Z. Naturforsch. 51b, 1605—1610 (1996); eingegangen am 18. März 1996 
  Published    1996 
  Keywords    Copper Tantalate, Thermal Decomposition, Perovskite, Trirutile, Metastable Compounds 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-1605.pdf 
 Identifier    ZNB-1996-51b-1605 
 Volume    51 
6Author    A. M. Orgenstern, H. OppermannRequires cookie*
 Title    Untersuchungen zur thermischen Zersetzung von Ammoniumlanthanhalogeniden Investigation on the Thermal D ecom p osition o f A m m onium H alides  
 Abstract    The decomposition equilibria of Ammonium Lanthanum Halides (NH4)2LaX5 were determined by total pressure measurements in a membrane zero manometer. The phases (NH4j2LaX5 decompose in one step to give solid LaX3 and gaseous NH3 and HX. From the decomposition functions the enthalpies of formation and the standard entropies of the phases are derived. ^H £(N H 4)2LaCl5,f,298) = -4 1 1 ,7 ± 2,2 kcal/mol; S°((NH4)2LaCl5,f,298) = 86,7 ± 2,3cal/Kmol; ^H^(NH4)2LaBr5,f,298) = -351,6 ± 3,8 kcal/mol; S°((NH4)2LaBr5,f,298) = 101,1 ± 1,8 cal/Kmol; _}H£(NH4)2LaI"f,298) = -2 6 8 ,9 ± 3,9 kcal/mol; S°((NH4)2LaI5,f,298) = 115,5 ± 4,3 cal/Kmol. 
  Reference    Z. Naturforsch. 52b, 696—706 (1997); eingegangen am 17. Februar 1997 
  Published    1997 
  Keywords    Synthesis, Ammonium Lanthanum Halides, Thermal Decomposition, Thermochemical Data 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0696.pdf 
 Identifier    ZNB-1997-52b-0696 
 Volume    52 
7Author    HansJoachim Berthold, Wolfgang LudwigRequires cookie*
 Title    Thermische Zersetzung nichtstöchiometrischer Cäsium-Silber-Gold(III)-Chloride und Darstellung von Mischkristallen zwischen Cs2AgAuCl6 und Cs2Au T Au rri Cl6 Thermal Decomposition of Nonstoichiometric Cesium-Silver-Gold(III)-Chloride and Preparation of Mixed Crystals of Cs2AgAuCl6 and Cs2Au I Au III Cl6  
 Abstract    The thermal decomposition of cesium-silver-gold(III)-chloride Cs2Agi_2Aui+2:/3CI6 with 0 <x < 0.63 at temperatures between 250 and 350 °C yields, under evolution of chlorine, mixed crystals of Cs2AgAuCl6 and Cs2Au I Au III Cl6. The composition of the latter can be described by the formula Cs2Agi_j,Au1/ I Au III Cl6 with y = 2a;/ (3—x). Apart from the formation of the mixed crystals the reaction leads to CsCl as a further phase, and in the case of x < 0.35 also to some Cs2AgAuCl6. Mixed crystals with 0.23 < y < 1, free from additional solid phases, can be obtained from strong hydrochloric acid solutions of Cs2AgAuCl6 and Cs2Au I Au III Cl6, which contain an excess of cesium ions. The mixed crystals are isostructural with Cs2Au I Au III Cl6 (space group I4/mmm). The variation of the lattice constants with increasing silver content confirms that the univalent silver, in contrast to the univalent gold, shows no tendency toward the formation of linear dichloro complexes. Our investigations show that the "tetragonal modification of Cs2AgAuCle", described by Elliott and Pauling and obtained by them by heat treatment of cubic cesium-silver -gold(III)-chloride, is, in fact, C , S2Agi_2/Au2/ I Au III Cl6. 
  Reference    Z. Naturforsch. 35b, 970—975 (1980); eingegangen am 17. April 1980 
  Published    1980 
  Keywords    Cesium-Silver-Gold(III)-Chloride, Thermal Decomposition, Preparation, Lattice Constants 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0970.pdf 
 Identifier    ZNB-1980-35b-0970 
 Volume    35 
8Author    Klaus-Jürgen Range, Reinhard Zintl, AntonM. HeynsRequires cookie*
 Title    The Thermal Decomposition of Ammonium Metavanadate(V) in Open and Closed Systems  
 Abstract    The thermal decomposition of ammonium metavanadate(V) has been studied at atmospheric pressure, at hydrothermal, and high-pressure conditions, respectively. In a closed high-pressure system a redox reaction between vanadium(V) and ammonia takes place, to yield with increasing temperature the compounds (NH 4) 2 V 6 0 12 (0H) 2 , VO : _ A (OH) A , and V 2 "0 2 "_,, the composition of the product eventually approaching V 2 0 3 at 1100 °C. All these compounds can easily be con-verted into V 2 O s by heating in air. The mid-infrared spectra of the decomposition products obtained by slow heating of NH 4 VO, in air, are virtually identical and show that ammonium hexavanadate(V), (NH 4) 2 V h O| 6 , is the most important, and perhaps only, intermediate in the "non-reduction" case. On further heating, (NH 4) 2 V 6 0 lft may not only loose ammonia and water to form V 2 0 5 but could as well partially be reduced by ammonia. This could explain the diversity of intermediate "compounds" described in the literature. Hydrothermal reaction of NH 4 VO, yielded (NH 4) 05 V 2 O 5 , (NH 4) 2 V,0 8 , and V 2 0 3 at rather low temperatures. 
  Reference    Z. Naturforsch. 43b, 309—317 (1988); received November 9 1987 
  Published    1988 
  Keywords    Ammonium Metavanadate(V), Thermal Decomposition, High-pressure Reactions, Hydrothermal Reactions 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-0309.pdf 
 Identifier    ZNB-1988-43b-0309 
 Volume    43 
9Author    H. Oppermann, H. Dao Quoc, A. Morgenstern, Prof ManfredRequires cookie*
 Title    Thermisches Verhalten von festem LaAlCl6 und chemischer Transport von LaCl3 mit AICI3 Thermical Behaviour of Solid LaAlCl6 and Chemical Transport of LaCl3 with A1C13  
 Abstract    The thermodynamical data of solid aluminium lanthanum chloride LaAlCl6 have been ob­ tained by determination of the decomposition equilibria from total pressure measurements. The melting diagram was determined by DTA. The chemical transport of LaCl3 with A1C13 is suggesting the existence of the gaseous complex LaAl3C l12. The data are: Z\H(LaAlCl6 f 298) =-427,1 ±2,5 kcal/mol, S°(LaAlCl6.f.298) = 61 ±2,5 cal/K-mol, _AH(LaAl3C l12 g 298) =-712 ± 7 kcal/mol, S°(LaAl3C l12>g,298) = 205 ± 3 cal/K-mol. 
  Reference    Z. Naturforsch. 54b, 1410—1416 (1999); eingegangen am 15. Juli 1999 
  Published    1999 
  Keywords    Aluminium Lanthanum Chloride, Thermal Decomposition, Chemical Transport, Enthalpy, Entropy 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1410.pdf 
 Identifier    ZNB-1999-54b-1410 
 Volume    54 
10Author    C. Hennig, H. OppermannRequires cookie*
 Title    Thermische Zersetzung und Lösungskalorimetrie von Ammoniumneodymiodiden Thermal Decomposition and Solution Calorimetry of Ammonium Neodymium Iodides  
 Abstract    The thermodynamical data of ammonium neodymium iodides (N H 4)3N dI6 and (NH4)2NdI5 were derived by the determination of their decomposition equilibria by total pressure measurements. Moreover, solution calorimetry was applied. The enthalpies of for­ mation of these phases were calculated from their heats of solution and from the enthalpies of formation and the heats of solution of N dl3 and NH4I in 4n HI (aq.) at 298 K. Data by total pressure measurement: ZlH ^(N H 4),N dI6f298) = -306,7 ± 4,9 kcal/mol; S°((NH4)3NdI6f298) = 152,8 ± 5,7 cal/K-mol; Z)H ^(NH 4)-,N d i,f,98) = -260,9 ± 4,2 kcal/mol; S°((NH4)2N dI3,f,298) = 114,3 ± 4,7 cal/K-mol. Data by solution calorimetry: ZlHß(Ndl3 f 298) = -154,3 ± 2,0 kcal/mol; z!HB((NH4j,N dI6f298) = -299,6 ± 3,2 kcal/mol; /1H^((NH4)2NdIsf998) = -255,2 ± 2,8 kcal/mol. 
  Reference    (Z. Naturforsch. 55b, 65—73 [2000]; eingegangen am 14. O ktober 1999) 
  Published    2000 
  Keywords    Ammonium Neodymium Iodides, Neodymium Iodide, Thermal Decomposition, Thermodynamical D ata Solution Calorimetry 
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 TEI-XML for    default:Reihe_B/55/ZNB-2000-55b-0065.pdf 
 Identifier    ZNB-2000-55b-0065 
 Volume    55 
11Author    Requires cookie*
 Title    Ein Am m onium (2:5)-m olybdat aus wäßriger Lösung An Ammonium(2:5)-molybdate from Aqueous Solution  
  Reference    (Z. Naturforsch. 30b, 63—65 [1975]; eingegangen am 8. Oktober 1974) 
  Published    1975 
  Keywords    Ammonium(2:5)-molybdate, IR Spectra, Raman Spectra, Thermal Decomposition, Polymerie Ammonium Octamolybdate 
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 TEI-XML for    default:Reihe_B/30/ZNB-1975-30b-0063.pdf 
 Identifier    ZNB-1975-30b-0063 
 Volume    30 
12Author    Ursula BentrupRequires cookie*
 Title    Über die thermische Zersetzung von N 2H6[CrF5(H20)] und die neue Verbindung N2H6CrF5  
 Abstract    Thermal decomposition of N 2H 6[CrF5(H 20)] has been investigated by thermoanalytical, X-ray and IR spectroscopic methods. U nder quasi-isobaric conditions the decomposition takes place in several steps. The intermediate N 2H 6C rF 5 has been found which crystallizes monoclinically with a = 555.0 pm, b = 1084.6 pm, c = 777.0 pm,/? = 91.76°. N 2H 6C rF 5 decom­ poses via an am orphous intermediate to give pure rhomboedrical C rF 3 as the final product. One of the intermediate has been identified as chrom ium fluoride am moniate C rF 3-0.4 N H 3. No hydrolysis reactions have been observed. 
  Reference    Z. Naturforsch. 47b, 957—961 (1992); eingegangen am 6. Februar 1992 
  Published    1992 
  Keywords    Hydrazinium Pentafluorochrom ates(III), Fluorochrom ates(III), Thermal Decomposition, IR Spectra, X-Ray 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0957.pdf 
 Identifier    ZNB-1992-47b-0957 
 Volume    47 
13Author    C. Hennig3, H. Oppermann, A. BlonskabRequires cookie*
 Title    Thermische Zersetzung und Lösungskalorimetrie von Ammoniumeuropiumchloriden Thermal Decomposition and Solution Calorimetry of Ammonium Europium Chlorides  
 Abstract    The thermal decomposition equilibria of ammonium europium chlorides (NH4)3EuCl6, (NH4)2EuC15 and NH4Eu2C17 have been investigated by total pressure measurements in a membrane zero manometer. The thermodynamic data of these solid phases have been deri­ ved from the decomposition functions. The standard enthalpies of solution in 4n HC1 (aq.) of (NH4)3EuC16, (NH4)2EuC15, NH4Eu2C17, EuC13 and Eu20 3 were measured. On the basis of these values and tabulated data, the standard enthalpies at 298 K of the ammonium europium chlorides were derived and compared with the obtained results from the total pressure measu­ rements. Data by total pressure measurement: 
  Reference    Z. Naturforsch. 53b, 1169—1179 (1998); eingegangen am 2. Juni 1998 
  Published    1998 
  Keywords    Ammonium Europium Chlorides, Europium Chloride, Thermal Decomposition, Standard Enthalpy of Formation, Standard Entropy 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-1169.pdf 
 Identifier    ZNB-1998-53b-1169 
 Volume    53 
14Author    C. Hennig, H. OppermannRequires cookie*
 Title    Thermische Zersetzung und Lösungskalorimetrie von Ammoniumneodymbromiden Thermal Decomposition and Solution Calorimetry of Ammonium Neodymium Bromides  
 Abstract    The thermal decomposition equilibria of ammonium neodymium bromides (NH4)3NdBr6, (NH4)2NdBr5 and NH4Nd2Br7 have been investigated by total pressure measurements. The thermodynamical data of these solid phase complexes have been derived from the decomposition functions. The standard enthalpies of solution in 4N HBr (aq.) of (NH4)3NdBr6, (NH4)2NdBr5, NH4Nd2Br7, NdBr3 and Nd20 3 were measured. On the basis of these values and tabulated data, the standard enthalpies at 298 K of the ammonium neodymium bromides were derived and compared with the results obtained from the total pressure measurements. Data by total pressure measurement: /\Hß((NH4)3NdBr6 f i98) = -399,1 ± 4,9 kcal/mol; S°((NH4)3NdBr6f298) = 153,4 ± 7,4 cal/K-mol; Z\H£((NH4)2NdBr5 f 298) = -343,0 ± 4,4 kcal/mol; S°((NH4),NdBr5 f ,98) = 109,9 ± 6 , 8 cal/K-mol; ^H ß(N H 4N d,Br7 f 298) = -484,0 ± 5,1 kcal/mol; S°(NH4Nd2Br7 ff<298) = 127,9 ± 6 , 6 cal/K-mol. Data by solution calorimetry: zAHß(NdBr3 , -> 98) = -208,7 ± 1,6 kcal/mol; ^\Hß((NH4)3-NdBr6 f 298) = -404,8 ± 2,7 kcal/mol; _\H^((NH4),NdBr5 f ,98) = -344,2 ± 2,4 kcal/mol; JkHß(NH4Nd2Br7 f 298) = -482,7 ± 3,7 kcal/mol. 
  Reference    Z. Naturforsch. 54b, 1283—1294 (1999); eingegangen am 22. Juli 1999 
  Published    1999 
  Keywords    Ammonium Neodymium Bromides, Neodymium Bromide, Thermal Decomposition, Standard Enthalpy of Formation, Standard Entropy 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1283.pdf 
 Identifier    ZNB-1999-54b-1283 
 Volume    54 
15Author    H.-J Frohn3, H. Franke3, V. V. BardinbRequires cookie*
 Title    A Simple and Convenient Route to Arylxenon(II) Tetrafluoroborates  
 Abstract    An improved synthesis of arylxenon(II) salts is reported. The series of fluoro-containing arylxenon(II) tetrafluoroborates (aryl = C6F5, 2,3,4,5-C6HF4, 3,4,5-C6H2F3 and 3,5-CöH3F2) are prepared by the reaction of xenon difluoride with the corresponding aryldifluoroboranes. The salts [CöFsXe] [BF4] and [2,3,4,5-C6HF4Xe] [BF4] are long-term stable in anhydrous HF (aHF) solution at rt, while [3,4,5-C6H2F3Xe] [BF4] and [3 ,5-C6H3F2Xe] [BF4] are converted into 1,2,3,5-tetrafluorobenzene and 1,3,5-trifluorobenzene, respectively, within a few hours. 
  Reference    Z. Naturforsch. 54b, 1495—1498 (1999); received October 4 1999 
  Published    1999 
  Keywords    Xenon Difluoride, Fluorinated Aryldifluoroboranes, Fluorinated Arylxenon(II) Salts, Fluorine-Aryl Substitution, Thermal Decomposition 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1495.pdf 
 Identifier    ZNB-1999-54b-1495 
 Volume    54