Výsledky vyhledávání - "Helmut Schöllhorn"

Metal-stabilized rare tautomers of nucleobases. 4. On the question of adenine tautomerization by a coordinated platinum(II)

Autor: Bernhard Lippert, Ulf Thewalt, Helmut Schöllhorn

Publikováno v: Inorganica Chimica Acta. :723-732

An attempt is described and critically asssessed to use the ‘method of basicity measurements’ for estimating the effect of Pt(II) electrophiles bound to the N7 position of the model nucleobase 9-methyladenine to shift the tautomer equilibrium fro

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::15939bdf4ebb46cf816119a0284a8d7a
https://doi.org/10.1016/s0020-1693(00)92417-4

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Mono-, di- and trinuclear Pt(II), mononuclear Pt(IV), mixed Pt(II),Pt(IV), mixed Pt(II),Ag(I) complexes of 9-methyladenine (9-MeA), and the X-ray structure of [(dien)Pt(9-MeA-N1)](NO3)2·H2O

Autor: Bernhard Lippert, Frank Schwarz, Helmut Schöllhorn, Ulf Thewalt

Publikováno v: Inorganica Chimica Acta. 176:113-121

Previously studied ( 1 H NMR) mono- and dinuclear complexes obtained by reactions of [(dien)Pt(II)] with 9-methyladenine (9-MeA) have been isolated and characterized: [(dien)Pt(9-MeA- N 7 )](NO 3 ) 2 ·H 2 O ( 1 ), [(dien)Pt(9-MeA- N 1 )](NO 3 ) 2 ·

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8e0880f7fdcda0497e007a5f48dcbf77
https://doi.org/10.1016/s0020-1693(00)85101-4

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Bis(9-ethylguaninium) and bis(9-ethylguanine) complexes of pt(II): preparation and crystal structures of cis-[Cl2Pt(9-EtGH2)2]CL2·2H2O and cis-[(pra)2Pt(9-EtGH)2](NO3)2 (pra  n-propylamine)

Autor: Gabriele Raudaschl-Sieber, L. Sindellari, Helmut Schöllhorn, Bernhard Lippert, Ulf Thewalt

Publikováno v: Inorganica Chimica Acta. 168:27-32

The structurcs of two Pt(II) complexes cis -[Cl 2 Pt- (9-EtGH 2 ) 2 ]Cl 2 ·2H 2 O (2) and cis -[(pra) 2 Pt(9- EtGH) 2 ](NO 3 ) 2 (3) with 9-EtGH2  9-ethylguaninium cation, 9-EtGH  neutral 9-ethylguanine and pra  n-propylamine, are reported.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a9e8afa9d8e228669a1c45c9dfb94086
https://doi.org/10.1016/s0020-1693(00)88013-5

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The x-ray structure of cis-bis(cyclopropylamine)bis(1-methylthyminato-N3)-platinum(II) dihydrate, cis-(cpa)2Pt(1-MeT)2·2H2O, and chemistry related to ‘platinum thymine purple’

Autor: Helmut Schöllhorn, Ulf Thewalt, Oliver Renn, Bernhard Lippert

Publikováno v: Inorganica Chimica Acta. 167:123-130

The crystal structure of cis-(cpa)2Pt(1-MeT)2·2H2O (1) with cpa = cyclopropylamine and 1-MeT = 1-methylthymine anion (C6H7N2O2), is reported, 1 crystallizes in the monoclinic system, space group P21/c, with a = 10.645(2), b = 14.878(3), c = 15.535(3

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::20da32024f38b979b24b4ce3e9876c4e
https://doi.org/10.1016/s0020-1693(00)83946-8

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Alkali-nucleobase interactions: Involvement of exocyclic oxygens of 1-methyluracil and 1-methylthymine in Na+ binding

Autor: Hans Preut, Helmut Schöllhorn, Ulf Thewalt, Bernhard Lippert, Birgit Fischer

Publikováno v: Polyhedron. 9:2199-2204

Co-crystallization of Na[AuCl4] with 1-methyluracil, C5H6N2O2 (1-MeUH), and 1-methylthymine, C6H8N2O2 (1-MeTH), at pH 0.8 yields predominently salts of composition [Na(1-MeUH)4][AuCl4] (1) and [Na(1-MeTH)(H2O)4][AUCl4]·1-MeTH·2H2O (2). Both 1 and 2

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f966940fb4d09cd510330b9259dc3d4f
https://doi.org/10.1016/s0277-5387(00)86942-9

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Unusual dehydrogenation of a diethylenetriamine ligand to a Schiff base ligand in the co-ordination sphere of platinum(IV)

Autor: Helmut Schöllhorn, Frank Schwarz, Ulf Thewalt, Bernhard Lippert

Publikováno v: J. Chem. Soc., Chem. Commun.. :1282-1284

Trans,mer-[(OH)2(dien)Pt(N-3-1 mec)](ClO4)2, (2), (dien = diethylenetriamine, C4H13N3; 1 mec = 1-methylcytosine, C5H7N3O) is, on warming in H2O, pH ca. 2–6, converted to several products, including the corresponding sym-fac, cis-isomer (4) and a Pt

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e171eb25592489837a232af9b7aade6f
https://doi.org/10.1039/c39900001282

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Zweikernige η5-pentamethylcyclopentadienyl-rhenium-komplexe mit einer chalkogenbrücke. Die molekülstruktur von [(η5-C5Me5)Re(CO)2]2(μ-Se)

Autor: A. Razavi, Wolfgang A. Herrmann, Ulf Thewalt, Helmut Schöllhorn, Bertram Schmidkonz, Max Herberhold, Christian Hecht

Publikováno v: Journal of Organometallic Chemistry. 299:213-221

We report the synthesis and characterisation of binuclear η 5 -pentamethylcyclopentadienylrhenium complexes, [(η 5 -C 5 Me 5 )Re(CO) 2 ] 2 (μ-E) (E = S ( 2 ), Se ( 3 ), Te ( 4 )), containing a chalcogen bridge in addition to a ReRe bond. Accord

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::98349db631efb008bf1a1582c85118a6
https://doi.org/10.1016/0022-328x(86)82017-4

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Interaction of cis-Pt(NH3)2Cl2 with amino acids. The crystal structures of cis-[Pt(NH3)2(gly)] (NO3), cis-[Pt(NH3)2(ala)](NO3) and cis-[Pt(NH3)2(val)](NO3)

Autor: Ulf Thewalt, Gabriele Trotscher, Akis Iakovidis, Helmut Schöllhorn, Nick Hadjiliadis

Publikováno v: Inorganica Chimica Acta. 164:221-229

The reactions of cis -Pt(NH 3 ) 2 Cl 2 with the amino acids of increasing aliphatic side chain glycine (gly), L-alanine (ala), 2-amino-butyric acid (2-abaH), L-norvaline (n-val) and L-valine (valH) were studied in aqueous solutions. Five new chelate

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a89d665866eb5be0440134d112597119
https://doi.org/10.1016/s0020-1693(00)83226-0

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Crystal structures of two Pt(II) diamine compounds: trans-Pt(CH3NH2)2Cl2 and cis-Pt[(CH3)2NH]2Cl2

Autor: Helmut Schöllhorn, Bernhard Lippert, Jorma Arpalahti, Ulf Thewalt

Publikováno v: Inorganica Chimica Acta. 153:45-49

The structures of two Pt(II) diamine compounds, trans-Pt(CH3NH2)2Cl2 (1) and cis-Pt[(CH3)2NH]2Cl2 (2), have been determined by X-ray diffraction and refined to R = 0.051 for 371 reflections (1) and R = 0.038 for 1888 reflections (2). Compound 1 cryst

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f886e9c002dc6426cf0f9d3bcb5638ab
https://doi.org/10.1016/s0020-1693(00)83355-1

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A heteronuclear (Pt, Zn) complex of 1-methyluracil with different coordination geometries (square-planar and square-pyramidal) of the two metals

Autor: Ulf Thewalt, Bernhard Lippert, Helmut Schöllhorn

Publikováno v: Inorganica Chimica Acta. 108:77-81

Reaction of cis -(NH 3 ) 2 Pt(1-MeU) 2 (1-MeU = 1- methyluracil anion, C 5 H 5 N 2 O 2 ) with ZnSO 4 ·7H 2 O leads to the formation of a dinuclear complex of composition [(NH 3 ) 2 Pt(C 5 H 5 N 2 O 2 ) 2 Zn(H 2 O) 3 ]SO 4 · 2H 2 O. The compound cry

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b626a779935225e4df1e57be0ac9bdd7
https://doi.org/10.1016/s0020-1693(00)81616-3

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