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  • 1
    Electronic Resource
    Electronic Resource
    One- and two-frequency multiple-photon dissociation (MPD) of SF6 under molecular-beam conditions: Effect of fluence and temperature (1984)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 4 (1984), S. 548-556 
    Details
    ISSN: 0392-6737
    Keywords: Molecular photon processes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto La dissociazione multifotonica (MPD) dell'SF6 eccitato da uno o due laser a CO2 è stata studiata in fascio molecolare supersonico a diverse temperature rotovibrazionali. È stata inoltre misurata la dipendenza dell'efficienza di dissociazione dalla fluenza del laser a diverse frequenze di eccitazione. I picchi spettrali sono stati interpretati sulla base di recenti ed accurati calcoli della struttura rotovibrazionale del modoν 3.
    Abstract: Резюме Исследуется многофотонная диссоциация SF6, одним и двумя CO2 лазерами в условиях молекулярного пучка при различных вращательно-колеба-теляных температурах. Изучаестя зависимость многофототонной диссоциации от флуенса CO2 лазера при различных частотах. Спектральые пики интерпетируются на основе аккуратных вычислений вращательно-колебательной структуры модыν 3
    Notes: Summary One- and two-frequency IR multiple-photon dissociation (MPD) of SF6 has been performed under molecular-beam conditions at different rotovibrational temperatures. The dependence of MPD on CO2 laser fluence has been studied at different frequencies. The experimental structures have been interpreted on the basis of accurate calculations of the vibrorotational structure ofν 3 overtone states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02450959
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  • 2
    Electronic Resource
    Electronic Resource
    The complete and symmetric transcription of the main non coding region of rat mitochondrial genome: in vivo mapping of heavy and light transcripts (1990)
    Springer
    Current genetics 17 (1990), S. 247-253 
    Details
    ISSN: 1432-0983
    Keywords: Antisense RNA ; mt D-loop ; mt promoters-mt regulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The experiments here reported demonstrate that the main non-coding region of rat mitochondrial DNA is symmetrically transcribed. We have identified stable heavy and light transcripts, whose pattern is rather complex, in the D-loop region of rat mitochondrial DNA. Their relative concentrations have been determined. We detected heavy transcripts which encompass the whole Dloop and more abundant heavy RNA species which we interpreted as transcripts terminating downstream of the 3′ end of the last coded gene (Thr-tRNA). The processed heavy RNA species contain polyA, suggesting a strict association between cleavage and polyadenylation. The pattern of light transcripts shows a long RNA, which, starting from the light strand promoter, covers the whole segment, and shorter RNA species which seems to be actively processed at the level of the conserved sequence boxes, probably acting as primers. The symmetric transcription of the D-loop containing region of rat mitochondrial DNA, and in particular the presence of stable transcripts complementary to the putative RNA primers, suggest that mechanisms mediated by interaction between complementary transcripts (antisense RNAs) might play a role in the regulation of mitochondrial DNA replication and expression.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00312616
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  • 3
    Electronic Resource
    Electronic Resource
    Theory of growth and mechanical properties of nanotubes (1998)
    Springer
    Applied physics 67 (1998), S. 39-46 
    Details
    ISSN: 1432-0630
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050735
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  • 4
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of 1-(2-aminoethyl)biguanide-isothiocyanato-copper(II) thiocyanate (1971)
    Springer
    Journal of chemical crystallography 1 (1971), S. 147-154 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal structure of 1-(2-aminoethyl)biguanide-isothiocyanato-copper(II)thiocyanate, [Cu(aebg)(NCS)] (SCN) (aebg = NH2. CH2. CH2. N=C(NH2). NH. C(NH). NH2) has been determined and refined by Fourier methods using three-dimensional X-ray data collected on a Weissenberg automatic diffractometer. The unit cell parameters are:a = 11·41(2),b = 8·81(2),c = 7·45(2) Å; α = 87·6° (2); β = 67·2° (2); γ = 70·1° (2);Z = 2. Assuming space group P¯1, the structure was refined down toR = 8·5 %. The coordination around Cu is slightly distorted square planar and concerns three N atoms from the aebg ligand (Cu-N = 1·988(8), 2·019(7), 1·963(5) Å) and the terminal N of an isothiocyanate group (Cu-N = 1·941(5) Å). Two unsymmetrical, long interactions (Cu-N = 3·367(7) and 2·947(7) Å), with the N atoms belonging to two NCS groupstrans with respect to the coordination plane, complete the coordination to a distorted octahedron. In the aebg ligand the double bonds are localized on the C-N groups, whose nitrogen atoms coordinate to the metal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01197798
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  • 5
    Electronic Resource
    Electronic Resource
    Crystal and molecular structures of the orthorhombic and monoclinic isomers of catena-di-μ-chloro-semicarbazidecopper(II) (1971)
    Springer
    Journal of chemical crystallography 1 (1971), S. 245-251 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal structures of two isomeric complex compounds of formula [Cu(Cl)2(NH2NHCONH2)] have been determined by X-ray diffraction methods. The orthorhombic isomer has space groupPna21 and unit cell constants:a = 6·91(1),b = 8·30(1),c = 10·24(1) Å;Z = 4. The monoclinic isomer has space groupP21/c and unit cell constants:a = 6·91(1),b = 8·30(1),c = 11·32(1) Å, β = 117·1(2)°;Z = 4. In both complexes coordination around copper is octahedral, with chains of coordination polyhedra along [100]. In the monoclinic compound, the two semicarbazide molecules, which are present in two adjacent octahedra along the chain, have the oxygen and nitrogen atoms in thetrans configuration, one with respect to the other, and are correlated by a centre of symmetry. In the orthorhombic compound, the two semicarbazide molecules are in thecis configuration and there is no centre of symmetry. In both compounds packing is determined by the NH···Cl and NH···O hydrogen bonds which join the chains together.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01198536
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  • 6
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of catena-μ-acetatomonobromodiamminecopper(II), C2H9BrCuN2O2 (1972)
    Springer
    Journal of chemical crystallography 2 (1972), S. 291-297 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal structure of catena-μ-acetatomonobromodiamminecopper([I]), C2H9BrCuN2O2, has been determined by three-dimensional Patterson and Fourier methods, and refined by least-squares procedures to R=4·7%. The orthorhombicPnma unit cell of dimensions a=9·01(1), b=7·60(1), c=10·38(1) Å contains 4 formula-entities. Two oxygen atoms from different acetate groups (Cu-O=2·001(6) and 1·995(5) Å) and two ammonia molecules (Cu-N=1·984(6) Å) coordinate to the copper atom in atrans square-planar arrangement. This is extended to square-pyramidal by a long contact with the bromine atom (Cu-Br=2·865(3) Å). One more long contact with the other oxygen atom of the carboxyl group (Cu-O(1i)=2·942(7) Å) realizes a distorted octahedral coordination. The acetate groups lie in mirror planes, and bridge the coordination polyhedra in zig-zag chains parallel to [100].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01246646
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  • 7
    Electronic Resource
    Electronic Resource
    The crystal and molecular structure of N′,N′-(2-chlorobenziliden)-histamine (1971)
    Springer
    Journal of chemical crystallography 1 (1971), S. 123-130 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary The crystal and molecular structure of the N′,N′-(2-chlorobenziliden)histamine has been determined and refined by Fourier and least-squares methods using three-dimensional X-ray data collected at room temperature by photographic techniques. Crystal data is as follows:a = 8·76(2),b = 13·82(1),c = 9·88(2) Å, β = 110·3(1) °,Z = 4. Space group:P21/c. The structure of the molecule is of the same tetrahydroimidazo[4,5-c]pyridine type found in spinaceamine. The benzene ring is rotated with respect to the other part of the molecule, which is formed by a non-planar tetrahydropyridine ring condensed with a planar imidazole ring. The bond distances and angles in these two rings are consistent with the observed distribution of the hydrogen atoms. Packing is mainly determined by a N-H ... N hydrogen bond, which joins the molecules in zig-zag chains running along [001].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01197795
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  • 8
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of di-μ-chloro(dicyandiamide)cadmium(II) (1971)
    Springer
    Journal of chemical crystallography 1 (1971), S. 291-295 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal structure of di-μ-chloro(dicyandiamide)cadmium(II) has been determined and refined by Fourier and least-squares methods toR = 0·037 using three-dimensional X-ray data collected at room-temperature on a single-crystal automated diffractometer. Crystal data are as follows:a = 10·796(7),b = 8·933(5),c = 6·847(3) Å,β = 99·9(1) °,Z = 4; space groupP21/n. The cadmium atom is surrounded by four chlorine (Cu-Cl = 2·572, 2·607, 2·630, 2·647 Å) and two nitrogen atoms (Cd-N (nitrilic) = 2·358 Å; Cd-N (guanidic) = 2·430 Å) so that the whole polyhedron appears as a slightly distorted octahedron. The chlorine atoms form bridges between adjacent metal atoms so that the coordination octahedra are linked in chains running along [001]. These chains are joined together by dicyandiamide bridges.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01200423
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  • 9
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of tetrakis(N,N′-diallylthiourea)nickel(II) iodide (1971)
    Springer
    Journal of chemical crystallography 1 (1971), S. 285-289 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary The crystal structure of tetrakis(N,N′-diallylthiourea)nickel(II) iodide [Ni(C7H12N2S)4I2] has been determined by a three-dimensional X-ray analysis. FinalR, after anisotropic least-squares refinement, is 8·8%. The crystals are tetragonal (P4/n):a = 11·24(1),c = 15·43(1) Å,Z = 2. Ni(II) is on a 4-fold axis; the coordination around it is flattened pyramidal and involves four sulphur atoms from four diallylthiourea molecules (Ni-S = 2·221 Å). Ni(II) is out of the plane through the sulphur atoms by 0·40 Å. Two I- ions lie on opposite sides with respect to the nickel atom along the 4-fold axis, at distances Ni...I(1) = 3·74 Å, Ni...I(2) = 6·64 Å. The orientation of the allylthiourea molecules is determined mainly by a hydrogen bond formed by one nitrogen (N(1)) with the iodine which is nearer to the nickel.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01200422
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  • 10
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of bis[pyridine-2-(N-cyanocarboxamidato)]aquocopper(II), Cu(C5H4NCONCN)2(OH2) (1971)
    Springer
    Journal of chemical crystallography 1 (1971), S. 389-396 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Bis[pyridine-2-(N-cyanocarboxamidato)]aquocopper(II), Cu(C5H4NCONCN)2(OH2), has been prepared and its i.r. spectrum and crystal structure have been determined. The crystals are triclinic (P¯1):a = 11·45(1),b = 10·35(1),c = 7·48(1) Å, α = 110·9(1), β = 102·2(2), γ = 108·9(1)°,Z = 2. The X-ray analysis, carried out using three-dimensional Patterson, Fourier and least-squares methods (finalR = 5·7%), showed copper(II) to be pentacoordinated, with two organic ligands chelating through their pyridine [Cu-N = 1·997(4), 1·989(4) Å] and amide nitrogen atoms [Cu-N = 1·980(7), 2·006(6) Å], and with one water molecule at a distance [Cu-OH2 = 2·335(4) Å] sensibly longer than the usual Cu-O(∼2·0 Å) coordinate bonds. The coordination polyhedron can be described either as a distorted tetrahedron formed by the nitrogen atoms with an extra position occupied by water or as a trigonal bipyramid having water and two nitrogen atoms in the equatorial plane. The packing determining interactions are the hydrogen bonds formed by water, and a long Cu...N (3·420 Å) contact between the metal and a nitrogen atom from an adjacent molecule.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01201129
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