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  • 1
    Electronic Resource
    Electronic Resource
    Crystal structure of [Mn2(III)(salpa)2Cl2(H2O)2] (H2salpa = 1-(salicylaldeneamino)-3-hydroxypropane) (1999)
    Springer
    Journal of chemical crystallography 29 (1999), S. 203-206 
    Details
    ISSN: 1572-8854
    Keywords: Manganese(III) ; Schiff base ; hydrogen bonding ; crystal structure ; Jahn-Teller distortion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The manganese complex, (Mn2(III)(salpa)2Cl2(H2O)2], has been prepared and its structure determined using x-ray crystallography. The dimer is a di-μ2-alkoxo complex which is a six-coordinate manganese dimer with unsupported alkoxide bridges and a rare example of a chloride- and water-containing manganese dimer. The complex crystallizes in the monoclinic space group P21/c with a = 9.315(5), b = 11.130(4), c = 11.637(5) Å, β = 104.33(3)°, V = 1169.0(9) Å3, and Z = 2. The structure comprises discrete binuclear clusters in which the metal atoms are bridged by two alkoxo oxygens of the salpa2− ligands. The Mn—O and Mn—N distances are in good agreement with those found for other manganese(III) Schiff base complexes. The Mn—Cl and Mn—O3 distances are 2.585(2) and 2.371(2) Å, respectively, and the Mn ··· Mn distance is 3.001(1) Å. In the crystal, there are two types of hydrogen bonding between the H2O molecule and the Cl atom with Cl ··· H(H2O) distance of 2.33(6) (intramolecule: −1 + x, y, −1 + z) and 2.68(6) Å (intermolecule: −1 + x, 0.5−y, −0.5 + z).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009526312170
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  • 2
    Electronic Resource
    Electronic Resource
    Crystal structure of [Cu2(II)(dmpa)2(p-Cl-C6H5COO)2] (Hdmpa = N,N-dimethyl-3-amino-1-propanol) (2000)
    Springer
    Journal of chemical crystallography 30 (2000), S. 35-38 
    Details
    ISSN: 1572-8854
    Keywords: copper(II) ; aminoalcoholato ; hydrogen bonding ; crystal structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The copper complex, [Cu2(II)(dmpa)2(p-Cl-C6H5COO)2], has been prepared and its structure determined using X-ray crystallography. The dimer is a di-μ2-alkoxo complex which is a five-coordinate copper dimer with unsupported alkoxo bridges. The complex crystallizes in the triclinic space group P-1 with a = 11.384(2), b = 14.636(5), c = 9.609(2) Å, α = 100.07(2), β = 104.33(3), γ = 72.79(2)°, V = 1471.8(7) Å3, and Z = 2. The structure is comprised of discrete binuclear clusters in which the metal atoms are bridged by two alkoxo oxygens of the dmpa− ligands. The Cu-O and Cu-N distances are in good agreement with those found for other copper(II) aminoalcoholato complexes. The Cu···Cu distance is 2.9765(6) Å. In the crystal, every two dimeric coordination molecules are combined together by the recognition through intermolecular hydrogen-bonding interactions between the apical water molecule and the non-coordinated O atom from the p-chlorobenzoato ligand, forminga tetramer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009542031602
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  • 3
    Electronic Resource
    Electronic Resource
    Crystal structure of [Co(bipy)(maleato) (H2O)3]·H2O (bipy = 2,2′-bipyridine) (1999)
    Springer
    Journal of chemical crystallography 29 (1999), S. 1081-1084 
    Details
    ISSN: 1572-8854
    Keywords: cobalt(II) ; bipyridine ; maleato ; crystal structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Preparation of the mononuclear cobalt(II) complex, [Co(bipy)(maleato) (H2O)3]·H2O (1) where bipy = 2,2′-bipyridine, were accomplished by reaction of an aqueous solution containing sodium maleate and an ethanolic solution of Co(NO3)2·6H2O and bipy. The crystal structure of complex (1) was determined by X-ray crystallography. The complex crystallizes in the monoclinic space group P21/n with a = 9.477(3), b = 7.660(2), c =23.526 (3) Å, β = 97.64(2)°, V = 1692.6(6) Å3, and Z = 4. The structure consists of discrete mononuclear cobalt molecules. The cobalt atom is six-coordinate and presents a slightly distorted octahedral geometry, which consists of the two imine N atoms of bipy, a terminal carboxylate O atom from maleato ligand, and a water O atom in the basal plane with Co—N bond distances of 2.116(2) and 2.124(3) Å and Co—O distances of 2.075(2) and 2.088(2) Å, respectively. The relatively shorter Co—O distances are due to the trans effect of the bipy ligand. The octahedral coordination is completed the other two water molecules. The coordinate and the lattice water molecules were identified by TG study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009597422495
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  • 4
    Electronic Resource
    Electronic Resource
    Crystal structure of [Mn(II)(phen)(ClCH2COO)2]n (phen = 1,10−phenanthroline) (1999)
    Springer
    Journal of chemical crystallography 29 (1999), S. 199-201 
    Details
    ISSN: 1572-8854
    Keywords: Manganese (II) ; phenanthroline ; polymeric complex ; crystal structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A new polymeric manganese(II) complex, [Mn(II)(phen)(ClCH2COO)2]n, was obtained from the reaction of Mn(ClCH2COO)2 with phen and its structure was determined by x-ray crystallography. The complex crystallizes in the monoclinic system, space group C2/c with a = 19.706(4), b = 11.381(3), c = 7.482(3) Å, β = 94.01(3)°, V = 1674.0(8) Å3, and Z = 4. The structure consists of an infinite chain. The manganese atom is located on a twofold axis and presents a distorted octahedral coordination sphere, which consists of the two N atoms of a phen ligand (Mn—N = 2.304(2) Å) and four carboxylato ligands. The Mn···Mn distance within the chain is 4.53 Å, and the carboxylato bridges present a syn-anti conformation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009574128099
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  • 5
    Electronic Resource
    Electronic Resource
    Self-assembly in transition metal complexes: structural characterization of a copper histamine nitrate [Cu(II)(him)2(NO3)2] (1999)
    Springer
    Journal of chemical crystallography 29 (1999), S. 1153-1155 
    Details
    ISSN: 1572-8854
    Keywords: copper (II) ; histamine ; self-assembly ; crystal structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A new monomeric copper (II) complex with histamine (him), [Cu(II)(him)2(No3)2], has been prepared by the reaction of Cu(NO3)2 with histaminium dichloride and its structure was determined by x-ray crystallography. The complex crystallizes in the triclinic system, space group $$P\bar 1$$ with a = 5.7238(4), b = 8.7094(7), c = 9.2481(11) Å, α = 69.693(8), β = 73.242(7), γ = 71.050(7)°, V = 400.84(6) Å3, and Z = 1. The structure consists of discrete [Cu(II)(him)2(NO3)2] molecules in which the metal atom is centrosymmetrically coordinated by two histamine ligands forming an equatorial plane with Cu–N(imidazole ring) being 2.032(2) and Cu–N(NH2 group) being 2.023(2) Å. Two O atoms from nitrate anions coordinate on the elongated axial positions with Cu–O being 2.549(2) Å. In the crystal structure, the molecules are organized by hydrogen bonds forming a two-dimensional network.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009574230460
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  • 6
    Electronic Resource
    Electronic Resource
    On integrability in the LIL for degenerateU-statistics (1996)
    Springer
    Journal of theoretical probability 9 (1996), S. 385-412 
    Details
    ISSN: 1572-9230
    Keywords: Law of the iterated logarithm ; completely degenerate (or canonical)U-statistics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract It is shown by example that square integrability of the kennelh of a completely degenerateU-statistic is not a necessary condition for the law of the iterated logarithm to hold. Necessary integrability conditions are given onh which are in a sense the strongest possible. Sufficient conditions for a degenerateU-statistic of order 2 to satisfy the LIL, weaker than square integrability of the kernel, are also given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02214656
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  • 7
    Electronic Resource
    Electronic Resource
    A decomposition for someU-type statistics (1996)
    Springer
    Journal of theoretical probability 9 (1996), S. 161-170 
    Details
    ISSN: 1572-9230
    Keywords: Hermite polynomial ; U-type statistics ; strong law
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Define , $$S_{k,n} = \Sigma _{1 \leqslant i_1〈 \cdot \cdot \cdot〈 l_k \leqslant n} X_{i_1 } \cdot \cdot \cdot X_{i_k } ,n \geqslant k \geqslant {\text{1}}$$ where {X, X n ,n≥1} are i.i.d. random variables withEX=0,EX 2=1 and letH k (·) denote the Hermite polynomial of degreek. By establishing an LIL for products of correlated sums of i.i.d. random variables, the a.s. decomposition $$\begin{gathered} k!S_{k,n} = n^{k/2} H_k (S_{1n} /n^{{1 \mathord{\left/ {\vphantom {1 2}} \right. \kern-\nulldelimiterspace} 2}} ) - \left( {\begin{array}{*{20}c} k \\ 2 \\ \end{array} } \right)S_{1.n}^{k - 2} \sum\limits_{i = 1}^n {(X_i^2 - 1)} \hfill \\ + O(n^{(k - 1)/2} (\log \log n)^{(k - 3/2} ) \hfill \\ \end{gathered} $$ valid whenEX 4〈∞, elicits an LIL forη k,n =k!S k,n −n k/2 H k (S 1n /n 1/2) under a reduced normalization. Moreover, whenE|X| p 〈∞ for somep in [2, 4], a Marcinkiewicz-Zygmund type strong law forη k,n is obtained, likewise under a reduced normalization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02213738
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  • 8
    Electronic Resource
    Electronic Resource
    Synthesis, crystal structure and properties of a manganese(III) Schiff-base complex: [{Mn(vanen)(Him)(H2O)}{Mn(vanen)(Him)2}](ClO4)2 · 4H2O(H2vanen = N,N′-bis(methoxysalicylidene)-1,2-diaminoethane) (1999)
    Springer
    Transition metal chemistry 24 (1999), S. 718-721 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A novel manganese(III) complex, [{Mn(vanen)(Him)(H2O)}(Mn(vanen)(Him)}](ClO4)2 · 4H2O [H2vanen = N,N′-bis(methoxysalicylidene)-1,2-diaminoethane], has been synthesized and characterized by elemental analysis, i.r. spectroscopy, t.g.a. and by an X-ray single crystal study. The complex consists of two sets of cations: [Mn(vanen)(Him)(H2O)]+ (A) and [Mn(vanen)(Him)2]+ (B), each of which has six-coordinate geometry, significantly elongated due to the Jahn-Teller distortion at the d4 manganese(III) center. The presence of lattice and coordinate water molecules are also confirmed by the t.g. study and the i.r. spectra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007033830388
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  • 9
    Electronic Resource
    Electronic Resource
    Synthesis, crystal structure and properties of a novel di-μ2-aqua bridged binuclear manganese(III) Schiff base complex [Mn(vanen)(H2O)2]2(ClO4)2 · 2H2O (2000)
    Springer
    Transition metal chemistry 25 (2000), S. 270-273 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The preparation and isolation of the binuclear manganese(III) complex, [Mn(vanen)(H2O)2]2(ClO4)2 · 2H2O was accomplished by air oxidation of a solution containing H2vanen**, Et3N, and Mn(ClO4)2 · 6H2O in absolute EtOH. The crystal structure of complex was determined by X-ray crystallography, and consists of two molecules bridged by two water molecules through hydrogen bonding. The manganese atom is six-coordinate and presents a distorted octahedral coordination sphere, which consists of the two imine N atoms and two phenolic O atoms of vanen2− ligand in the equatorial plane, with Mn–N bond distances of 1.975 and 1.987 Å, and Mn–O distances of 1.867 and 1.876 Å, respectively. The non-bonding interatomic Mn⋯Mn distance is 4.79 Å. In the axial direction, the elongated Mn–O(H2O) bond distances of 2.255 and 2.381 Å, respectively, are due to Jahn–Teller distortion at the d4 metal center. The presence of lattice and coordinate water molecules were also confirmed by the t.g. study and the i.r. spectra. Upon irradiation using visible light in water in the presence of p-benzoquinone, the complex demonstrates its ability to split water.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007088305341
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  • 10
    Electronic Resource
    Electronic Resource
    Regeneration of haploid plants from isolated microspores of asparagus (Asparagus officinalis L.) (1994)
    Springer
    Plant cell reports 13 (1994), S. 637-640 
    Details
    ISSN: 1432-203X
    Keywords: Asparagus officinalis L. ; Microspore culture ; Embryogenesis ; Haploid ; Plant growth regulators
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract High percentages of micro-calli and micro-derived embryos were produced from isolated asparagus microspores at late uninucleate stage on MS liquid medium supplemented with 1.0 mg l−1 2,4-D and 0.5 mg l−1 BA. Two types of calli, namely compact callus (CC) and loose callus (LC), were found. Plantlets were regenerated via organogenesis, when these calli were transferred onto MS solid medium supplemented with 1.0 mg l−1 BA and 0.2 mg l−1 IBA 6 weeks. Embryos were produced from liquid cultured microspores, or from solid cultured micro-calli. The frequencies of haploid plant production from organogenesis and embryogenesis were compared. Effects of plant growth regulators on callus production, plantlet regeneration, and haploid plant production were tested. The combination of BA 1.0 mg l−1 and IBA 0.2 mg l−1 resulted the highest precentage of haploid plant production (7.7% from CC, 4.3% from LC).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00232936
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