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1Author    Insan Boy, Gerhard Cordier, Brigitte Eisenmann, Rüdiger KniepRequires cookie*
 Title    Oligomere Tetraeder-Anionen in Borophosphaten: Darstellung und Kristall­ strukturen von NaFe[BP20 7(0H )3] und K2 Fe2 [B2 P4 0 1 6 (0 H)2 ] Oligomeric Tetrahedral Anions in Borophosphates: Synthesis and Crystal Structures of NaFe[BP20 7(0 H )3] and K2Fe2[B2P40 16(0 H )2]  
 Abstract    Crystals of the title compounds were grown under hydrothermal conditions. The crystal structures were determined by single crystal data. NaFe[BP20 7(0 H)3] (monoclinic, C 2/c, a = 1042.0(2), b = 821.5(1), c = 921.7(1) pm, ß = 116.60(1)°, Z=4): The crystal structure contains isolated anions [BP20 7(0 H)3]4~, which correspond to trinuclear units P 0 l/20 3-B 0 2/ 2(0 H)2-P 0 1/ 20 2(0 H) of corner sharing tetrahedra. Fe3+ is coordinated octahedrally by oxygen, Na+ is 8 -fold coordinated by oxygen forming cubes. K2Fe2 [B2P40 16(0 H)2] (triclinic, P i, a = 516.7(1), b = 808.9(1), c = 834.0(1) pm, a = 87.06(f), ß = 80.21(1), 7 = 86.59(1)°, Z = 1): The crystal structure contains isolated anions [B2P40 16(0 H)2]8_. Four-membered rings of tetrahedra with two additional terminal phosphate groups are formed by condensation of two trinuclear units P 0 1/ 20 3-B 0 3/ 2(0 H)-P 0 2/ 20 2. Fe3+ is in an octahedral and K+ in an irregularly 10-fold coordination by oxygen. 
  Reference    Z. Naturforsch. 53b, 165—170 (1998); eingegangen am 13. Oktober 1997 
  Published    1998 
  Keywords    Boron, Tetrahedral Anions, Phosphorus 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0165.pdf 
 Identifier    ZNB-1998-53b-0165 
 Volume    53 
2Author    Insan Boy, G.Erhard Cordier, Rüdiger KniepRequires cookie*
 Title    Oligomere Tetraeder-Anionen in Borophosphaten: Sechserringe mit offenen und cyclischen Phosphat-Verzweigungen in der Kristallstruktur von K6Cu2[B4P80 28(OH)6] O ligom eric Tetrahedral A nions in Borophosphates: Six-M em bered Rings with Open and Cyclic Phosphate B ranchings in the Crystal Structure o f K6C u2[B4P80 28( 0 H )6]  
 Abstract    Crystals of K6Cu2[B4Ph02h(OH)6] were grown under hydrothermal conditions at 160 °C. The crystal structure (monochnic, P 2,/c (Nr. 14), a = 961.8(1), b = 1755.0(1), c = 942.0(1) pm, /3 = 112.29(1)°, Z = 2) contains oligomeric tetrahedral anions based on six-membered rings {B4P2 0 |()0 8/2} with additional branchings by hydrogenphosphate-groups (open branching: 4 x H P030 , /2; cyclic branching: 2 x HP0 20 2/ 2). The complex borophosphate anion is represented by the formula [B4P8O28(OH)6]l0_. Cu2+ is in a tetragonal pyramidal and K+ in an irregular coordination by eight and nine oxygen ligands, respectively. 
  Reference    Z. Naturforsch. 53b, 1440—1444 (1998); eingegangen am 23. Juli 1998 
  Published    1998 
  Keywords    Boron, Phosphorus, Tetrahedral Anions 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-1440.pdf 
 Identifier    ZNB-1998-53b-1440 
 Volume    53 
3Author    Lothar Weber, Eckhard Dobbert, Andreas Rausch, Hans-Georg Stammler, Beate NeumannRequires cookie*
 Title    Synthesis, Structure and Reactivity of 2-Amino-and 2-Imino-2,3-dihydro-1H -1,3,2-diazaboroles  
 Abstract    The 2-halo-2,3-dihydro-1H-1,3,2-diazaboroles RN-CH=CH-N(R)BX (la': R = rBu, X = Br; lb: R = 2,6-Me2C6H.v, X = I) were converted into the 2-amino-2,3-dihydro-\H -1,3,2-diazaboroles RN-CH=CH-N(R)B-NH2 (2a: R = /Bu; 2b: 2,6-Me2C6H3) by treatment with dry gaseous ammonia. Similarly reaction of la' with 2,6-dimethylaniline or /BuNHt afforded the corresponding derivates /BuN-CH=CH-N(rBu)BNHR' (3; R 1 = 2,6-Me2C6H3; 4; R1 = rBu). The treatment of la' with the ethylene diamine adduct of lithium acetylide led to the formation of [rBuN-CH=CH-N(/Bu)BN(H)CH2]2 (5). Lithiation of 2 a and subsequent silylation gave 6 (R1 = SiMe3), which was transformed to the diborolylamine [/BuN-CH=CH-N(rBu)B]2NH (7) upon exposure to la'. Borolylketimine /BuN-CH=CH-N(/Bu)B-N=CPh2 (8) and borolylcar-bodiimide fBuN-CH=CHN(/Bu)B-N=C=N-SiMe3 (9) resulted from la' and Ph2C=NSiMe3 or Me3SiN=C=NSiMe3, respectively. All the new compounds were characterized by elemental analyses as well as spectroscopic data (IR, 'H, n B, i3C NMR, MS). Heterocycle 5 was also subjected to an X-ray diffraction analysis. 
  Reference    Z. Naturforsch. 54b, 363—371 (1999); eingegangen am 25. September 1998 
  Published    1999 
  Keywords    Boron, Diazaboroles, Amines, Imines 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0363.pdf 
 Identifier    ZNB-1999-54b-0363 
 Volume    54 
4Author    Rhenium, BoronR. Obert, D. Antona, E.Berhard Schweda, Joachim SträhleRequires cookie*
 Title    Synthese und Kristallstruktur von Re(NBCl3)Cl2[P(CH3)2C6H5]3, ein Komplex mit einer Nitridobrücke zwischen Rhenium und Bor Synthesis and Crystal Structure of Re(N BCl3)Cl2[P(CH3)2C6H 5]3, a Complex with a N itrido Bridge between  
 Abstract    R eN C l2(P M e2Ph)3 reacts as a Lewis base and with BC13 forms a nitrido bridge betw een Re and B. The resulting com plex R e(N B C l3)Cl2(PM e2Ph)3 crystallizes orthorhom bic in the space group Pn2! a with Z = 4. In the com plex each Re atom has six nearest neighbours in an almost octahedral arrangement with the NBC13 group being trans to one o f the Cl ligands. The difference betw een the two Re —Cl bond lengths (239,4 and 243,9 pm) indicates a weak trans effect o f NBC13. The linear bridge R e = N — B has bonding distances o f R e —N = 172,8 and N -B = 153 pm. B onding o f BC13 by the nitrido ligand causes a small 
  Reference    Z. Naturforsch. 39b, 733 (1984); eingegangen am 15. Februar 1983 
  Published    1984 
  Keywords    Nitrido Bridge, Synthesis, Crystal Structure, Rhenium, Boron 
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 TEI-XML for    default:Reihe_B/39/ZNB-1984-39b-0733.pdf 
 Identifier    ZNB-1984-39b-0733 
 Volume    39 
5Author    M. K. Das, S. C. HakrabortyRequires cookie*
 Title    Boron Spirochelates Derived from Some Hydroxamic Acids and Carboxylic Acids  
 Abstract    A number o f boron spirochelates o f the general formula B [R 'C 0 N (R)0 ]Y have been syn­ thesized by the single-pot reaction o f boric acid, a hydroxamic acid R'C O N (R)O H and a car­ boxylic acid H 2Y . The spirochelates have been characterized by elemental analyses, by IR, N M R ('H and nB) and UV spectra and conductance measurements. They are non-electro-lytes. 
  Reference    Z. Naturforsch. 45b, 1123—1127 (1990); received January 23 1990 
  Published    1990 
  Keywords    Boron, Hydroxam ic A cids, Carboxylic Acids, Spirochelates 
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 TEI-XML for    default:Reihe_B/45/ZNB-1990-45b-1123.pdf 
 Identifier    ZNB-1990-45b-1123 
 Volume    45 
6Author    Bernd Wrackmeyer, Jürgen WeidingerRequires cookie*
 Title    N-Boryl-Substituted Bis(amino)stannylenes and -plumbylenes  
 Abstract    Two equivalents of N-lithio-N-trimethylsilyl-amino-9-borabicyclo[3.3.1]nonane (1) react with tin and lead dichloride by salt elimination to give the corresponding bis(amino)stannylene 2 and -plumbylene 3, respectively. The compounds 2 and 3 are monomers in solution and were characterized by 'H , i3C, 14N, 29Si, ll9Sn and 207Pb NMR spectroscopy. 
  Reference    Z. Naturforsch. 52b, 947—950 (1997); received May 22 1997 
  Published    1997 
  Keywords    Boron, Tin, Lead, Metal Amides, NMR Spectra 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0947.pdf 
 Identifier    ZNB-1997-52b-0947 
 Volume    52 
7Author    R. Üdiger, K. NiepRequires cookie*
 Abstract    b[B2P20 8(0 H)] und Cs[B2P 2 0 8(0H)J: D ie ersten Borophosphate mit dreidimensional vernetzter Anionenteilstruktur R b[B 2P2O s(O H)] and C s[B 2P20 8(0 H)]: The First B oro p h o sp h ates with a T hree-dim ensional A nionic T etrahedral S tructure C ornelia Häuf, The isotypic borophosphates Rb[B2P20 8(0 H)] and Cs[B2P20 8(0 H)] were grown under hy­ drothermal conditions. The crystal structures were solved by single crystal methods (R b[B 2P20 8(0 H)]/C s[B 2 P20 8(0 H)]: monoclinic, 
  Reference    Z. Naturforsch. 52b, 1432—1435 (1997); eingegangen am 28. Juli 1997 
  Published    1997 
  Keywords    Boron, Crystal Structure, Framework, Channel, Phosphorus 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-1432_n.pdf 
 Identifier    ZNB-1997-52b-1432_n 
 Volume    52 
8Author    Z. NaturforschRequires cookie*
 Title    R eaction o f 9-B orabicyclo[3.3.1]nonane with N-Trim ethylsilylam ines -C leavage o f the N-Si or N -H Bond  
 Abstract    The reaction of dimeric 9-borabicyclo[3.3.1]no-nane 1 with N-trimethylsilyl-aniline 2 affords 9-anilino-9-borabicyclo[3.3.1]nonane 5 by elimina­ tion of trimethylsilane. In contrast, 1 reacts with the N-trimethylsilyl-2-aminopyridines 3 and 4 se­ lectively by elimination of H 2 to give the corre­ sponding N-trimethylsilyl-aminoboranes 6 and 7. The latter reactions proceed via formation of bo-rane-pyridine adducts. 
  Reference    Z. Naturforsch. 53b, 393—395 (1998); received December 29 1997 
  Published    1998 
  Keywords    Aminoborane, Aminosilane, Boron, Pyridine, NMR Data 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0393_n.pdf 
 Identifier    ZNB-1998-53b-0393_n 
 Volume    53 
9Author    Insan Boya, Rüdiger KniepaRequires cookie*
 Title    K[B6PO10(OH)4]: Ein Borophosphat mit gestreckten Bändern aus Tetraeder-Vierer-Ringen und offen-zyklischen Verzweigungen über planare B203(0 H)2-Gruppen K[B6PO 10(OH)4]: A Borophosphate Containing Rods of Tetrahedral Vierer-Rings with Additional Open-Loop Branchings via Planar B20 3(0 H )2 Groups  
 Abstract    K[B6PO|0(OH)4] was prepared under mild hydrothermal conditions (T = 170 °C) from a concentrated solution of K2B40 7 ■ 4H20 , KH2P 04, and HC1 (18%). The crystal structure of the tetragonal compound was solved by X-ray single crystal methods (space group P 4/ncc, No 130): a = 1209.66(13), c = 759.05(7) pm; Z = 4. The anionic partial structure consists of infinite rods of ^ [B6POl0(OH)4]~ which are built of vierer-rings of alternating B 0 4 and P04 tetrahedra with additional open-loop branchings via planar B20 3(0 H)2 groups at the B 0 4 units by sharing common oxygen functions. Potassium (K+) is located within structural channels running along [001]; the eightfold coordination by oxygen (OH-groups) results in a (slightly) distorted tetragonal antiprism. 
  Reference    Z. Naturforsch. 54b, 895—898 (1999); eingegangen am 9. April 1999 
  Published    1999 
  Keywords    Boron, Phosphorus, Tetrahedral Rods, Planar Borate Groups 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0895.pdf 
 Identifier    ZNB-1999-54b-0895 
 Volume    54 
10Author    E. Bengsch, J. Polster, M. SchwenkRequires cookie*
 Title    Effects of Simultaneous Supply of Silicon and Boron on Plant Growth and on Herbicide Toxicity  
 Abstract    An optimal supply of biodisposable silicon and boron shows a synergistic stimulation effect on plant growth. U nder these optim al growth conditions herbicides may become particularly toxic for cultural plants. Plants inhibited by herbicides show distinctly higher boron contents than that of untreated samples. 
  Reference    Z. Naturforsch. 44c, 781—786 (1989); received April 24 1989 
  Published    1989 
  Keywords    Silicon, Boron, Plant G row th, H erbicide, Spinach 
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 TEI-XML for    default:Reihe_C/44/ZNC-1989-44c-0781.pdf 
 Identifier    ZNC-1989-44c-0781 
 Volume    44 
11Author    J. Polster, M. Schwenk, E. BengschRequires cookie*
 Title    The Role of Boron, Silicon and Nucleic Bases on Pollen Tube Growth of Lilium longiflorum (L.)  
 Abstract    It is possible to obtain pollen germination and pollen tube growth in vitro if boric acid is present. In this work the effect was studied using as a semiquantitative parameter the mean length (J) o f Lilium longißorum pollen tubes. Pollen tube growth was examinated in depend­ ence on boric acid, ortho-silicic acid, nucleic bases, Ca2+ and Zn2+ in 10% sucrose solution. The maximum o f 7is obtained for concentrations between 2 -2 0 ppm boron. The simultaneous supply o f silicon added as water glass leads to a synergistic stimulation effect on pollen tube growth and facilitates branching. The silicon action is preceded o f a pollen tube growth inhibi­ tion period during 3 h. Adenine and guanosine are able to substitute partially boron as pollen germination and pollen tube growth stimulator. Concentrations o f 100 ppm adenine leads to half the boron effect. The same stimulation effect is obtained by guanosine. Ca2+ can partially substitute boron as well. The stimulation action o f boron is significantly attenuated by Zn2+ and by the herbicide Dicuran. These and preceding results from physiological studies indicate that boron and silicon should be essential trace elements for the regulation o f molecular bio­ logical processes. 
  Reference    Z. Naturforsch. 47c, 102—2 (1992); received June 13/September 16 1991 
  Published    1992 
  Keywords    Pollen Tube Growth, Boron, Silicon, Lilium longiflorum, Germination 
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 TEI-XML for    default:Reihe_C/47/ZNC-1992-47c-0102.pdf 
 Identifier    ZNC-1992-47c-0102 
 Volume    47 
12Author    Detlef Gabel, Rita WalczynaRequires cookie*
 Title    B-Decachloro-o-carborane Derivatives Suitable for the Preparation of Boron-Labeled Biological Macromolecules  
  Reference    Z. Naturforsch. 37c, 1038—1039 (1982); received April 71982 
  Published    1982 
  Keywords    Boron, Neutron Capture Therapy, Boron-Labeled Proteins, B-Decachloro-o-carborane, Tumor Specific Antibodies 
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 TEI-XML for    default:Reihe_C/37/ZNC-1982-37c-1038_n.pdf 
 Identifier    ZNC-1982-37c-1038_n 
 Volume    37