201
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Stolz H, Langer V, Schreiber E, Permogorov S. Picosecond quantum-beat spectroscopy of bound excitons in CdS. PHYSICAL REVIEW LETTERS 1991; 67:679-682. [PMID: 10044961 DOI: 10.1103/physrevlett.67.679] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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202
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Grennberg H, Langer V, Bäckvall JE. Structure and reactivity of cis- and trans-bis-[{5-carbomethoxy-(1,2,3-η)-cyclohexenyl}palladium]. Evidence for a (σ-allyl)palladium intermediate in the cis-migration of acetate from palladium to coordinated π-allyl. ACTA ACUST UNITED AC 1991. [DOI: 10.1039/c39910001190] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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203
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Mangio R, Langer V, Johansson LG, Gultyai VP, Persson I, Elding LI. Structure and Properties of Calcium Sulfate Sulfite Dodecahydrate. ACTA ACUST UNITED AC 1991. [DOI: 10.3891/acta.chem.scand.45-0572] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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204
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Kraffert C, Walther D, Peters K, Lindqvist O, Langer V, Sieler J, Reinhold J, Hoyer E. Komplexe mit Dimethyltetrathiooxalat: Struktur und Eigenschaften von [Ni(S2C2(SMe)2)2] und [Pd(S2C2(SMe)2)(PPh3)2]. Z Anorg Allg Chem 1990. [DOI: 10.1002/zaac.19905880120] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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205
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Langer V, Stolz H. Observation of quantum beats in the resonance fluorescence of free excitons. PHYSICAL REVIEW LETTERS 1990; 64:854-857. [PMID: 10042098 DOI: 10.1103/physrevlett.64.854] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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206
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KočOvský P, Langer V, Gogoll A. Structural requirements for the thallium(III)-mediated cyclisation of unsaturated alcohols. A novel fragmentation reaction producing 19-norsteroids. ACTA ACUST UNITED AC 1990. [DOI: 10.1039/c39900001026] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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207
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Andersen L, Langer V, Strömberg A, Strömberg D. The structure of K2TeO3 – an experimental and theoretical study. ACTA CRYSTALLOGRAPHICA SECTION B: STRUCTURAL SCIENCE 1989. [DOI: 10.1107/s0108768189004684] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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208
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209
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Becker HD, Langer V, Skelton BW, White AH. Molecular Structures of Di(9-anthryl)Methanol and Di(9-anthryl) Ketone. Aust J Chem 1989. [DOI: 10.1071/ch9890603] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The molecular structures of di(9-anthryl)methanol (1) and di(9-anthryl) ketone (2) have been established by X-ray diffraction. The asymmetric unit of di(anthryl)methanol consists of two molecules in which the dihedral angle between the anthracene moieties is 81.4 and 86.3 respectively; steric interaction between the anthracene moieties results in them subtending angles of 115.0(7) and 115.8(8)� at the central carbon atom, and with unsymmetrical exocyclic angles at their point of attachment. In di(9-anthryl) ketone the planes of the anthracene systems are twisted out of the plane of the carbonyl group by 48.8 and 52.2� respectively, so that the dihedral angle between the two aromatic ring systems is 87.3�. The structures of di(anthryl)methanol and di(anthryl) ketone are discussed with respect to their different modes of photochemical isomerization by intramolecular cycloaddition.
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210
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Symerský J, Bláha K, Langer V. Structure of (3R,6S)-3-neopentyl-1,4-diazabicyclo[4.3.0]nonane-2,5-dione. Acta Crystallogr C 1987. [DOI: 10.1107/s0108270187095271] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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211
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Symerský J, Bláha K, Langer V. Structure of (8S)-8-hydroxymethyl-6,9-diazaspiro[4.5]decane-7,10-dione, a spirocyclic dipeptide. Acta Crystallogr C 1987. [DOI: 10.1107/s0108270187096045] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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212
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Symerský J, Kálal P, Bláha K, Langer V. Structure of 4-azatricyclo[4.3.1.13,8]undecan-5-one (homoazaadamantanone). Acta Crystallogr C 1986. [DOI: 10.1107/s0108270186097251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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213
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Nešpůrek S, Pilař J, Schmidt P, Šorm M, Langer V, Graja A, Sopa E. Organic semiconductors: optical magnetic and electrical properties of 1-methyl-3-propylimidazolium 7,7,8,8-tetracyano-p-quinodimethane. Chem Phys 1986. [DOI: 10.1016/0301-0104(86)87024-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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214
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Langer V, Huml K, Zachová J. Structure of the 1/2 complex of adenine and N-methyl-2-pyrrolidone, C5H5N5.2C5H9NO. Acta Crystallogr C 1984. [DOI: 10.1107/s0108270184010702] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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215
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216
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Kálal P, Bláha K, Langer V. Structure of 5-azatricyclo[4.3.1.03,8]decan-4-one hemihydrate, C9H13NO.1/2H2O. Acta Crystallogr C 1984. [DOI: 10.1107/s0108270184007496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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217
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Hašek J, Ječný J, Langer V, Huml K, Sedláček P. Cyclic trimer of poly(ethylene terephthalate). Structure recalculation. ACTA ACUST UNITED AC 1982. [DOI: 10.1107/s0567740882009716] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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218
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219
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Fábry J, Podlahová J, Loub J, Langer V. Structure of the 1:1 adduct of orthoperiodic acid and urea. ACTA CRYSTALLOGRAPHICA SECTION B: STRUCTURAL SCIENCE 1982. [DOI: 10.1107/s0567740882004932] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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220
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Langer V, Huml K, Reck G. The ion radical salt of 1-methyl-3-propylimidazolium with 7,7,8,8-tetracyano-p-quinodimethane:MPI+.TCNQ−. ACTA ACUST UNITED AC 1982. [DOI: 10.1107/s0567740882002696] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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221
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Podlahová J, Kratochvíl B, Langer V, Šilha J, Podlaha J. The protonation of the ethylenediphosphinetetraacetate anion and the crystal structure of the bis (hydrogen bromide) of ethylenediphosphinetetraacetic acid. ACTA ACUST UNITED AC 1981. [DOI: 10.1135/cccc19813063] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The equilibria and mechanism of addition of protons to the ethylenediphosphinetetraacetate anion (L4-) were studied in solution by the UV, IR, 1H and 31P NMR spectroscopic methods. A total of six protons can be bonded to the anion. They are added stepwise, first with partial formation of zwitterions containing P-H bonds, which then dissociate with formation of the free acid, H4L, where all four protons are bonded in carboxyl groups. The formation of zwitterions is strongly dependent on the concentration. In the final stage, the acid bonds two additional protons to form the bis-phosphonium cation, H6L2+. A number of isostructural salts containing this cation, H4L.2 HX (X = Cl, Br, I), have been prepared. The X-ray crystal structure determination of the bromide confirmed the expected arrangement. The bromide crystals are monoclinic, a = 578.2, b = 1 425.0, c = 1 046.7 pm, β = 103.07° with a space group of P21/c, Z = 2. The final R factor was 0.059 based on 1 109 observed reflections. The structure consists of H6L2+ cations containing protons bonded to phosphorus atoms (P-H distance 134 pm) and of bromide anions, located in gaps which are also sufficiently large for I- anions in the isostructural iodide. The interbonding of phosphonium cations proceeds through hydrogen bonds, C-OH...O=C, in which the O...O distance is 275.3 pm.
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222
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Hasek J, Ječný J, Langer V, Huml K, Sedlacek P. The structure of the cyclic trimer of poly(ethylene terephthalate). ACTA ACUST UNITED AC 1980. [DOI: 10.1107/s0567740880009727] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
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223
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Langer V, Huml K, Zachová J. The crystal and molecular structure of adeninium phosphate, C5H6N5+.-H2PO4−. ACTA ACUST UNITED AC 1979. [DOI: 10.1107/s0567740879005768] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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224
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Langer V, Huml K, Lessinger L. The crystal and molecular structure of adeninium hemisulfate hydrate, C5H5N5.0.5H2SO4.H2O. ACTA ACUST UNITED AC 1978. [DOI: 10.1107/s0567740878007797] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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225
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Langer V, Huml K. The crystal and molecular structure of adenine hydrobromide hemihydrate, C5H5N5.HBr.0.5H2O. ACTA ACUST UNITED AC 1978. [DOI: 10.1107/s0567740878006883] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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