Zeitschrift fur Naturforschung B (Z NATURFORSCH B)

Publisher: Max-Planck-Gesellschaft zur Förderung der Wissenschaften

Journal description

Zeitschrift für Naturforschung B (Chemical Sciences) is an international scientific journal which publishes original papers, microreviews, and letters from all areas of inorganic chemistry, solid state chemistry, coordination chemistry, molecular chemistry, and organic chemistry.

Current impact factor: 0.77

Impact Factor Rankings

2015 Impact Factor Available summer 2015
2013 / 2014 Impact Factor 0.772
2012 Impact Factor 0.899
2011 Impact Factor 0.864
2010 Impact Factor 0.816
2009 Impact Factor 0.953
2008 Impact Factor 0.852
2007 Impact Factor 0.77
2006 Impact Factor 0.825
2005 Impact Factor 0.798
2004 Impact Factor 0.647
2003 Impact Factor 0.729
2002 Impact Factor 0.774
2001 Impact Factor 0.761
2000 Impact Factor 0.635
1999 Impact Factor 0.744
1998 Impact Factor 0.731
1997 Impact Factor 0.864
1996 Impact Factor 1.136
1995 Impact Factor 0.972
1994 Impact Factor 0.878
1993 Impact Factor 0.919
1992 Impact Factor 0.87

Impact factor over time

Impact factor

Additional details

5-year impact 0.74
Cited half-life 0.00
Immediacy index 0.13
Eigenfactor 0.00
Article influence 0.16
Website Zeitschrift für Naturforschung - B website
Other titles Zeitschrift für Naturforschung., Zeitschrift für Naturforschung. B, A journal of chemical sciences, Journal of chemical sciences, Chemical sciences
ISSN 0932-0776
OCLC 15363854
Material type Periodical, Internet resource
Document type Journal / Magazine / Newspaper, Internet Resource

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: Irradiation of tricarbonyl(η5-2,4-dimethyl-2,4-pentadien-1-yl)manganese (1) in tetrahydrofuran (THF) at 208 K affords the carmine solvent complex dicarbonyl(η5-2,4-dimethyl-2,4-pentadien-1-yl)(THF)manganese (2). Complex 2 thermally reacts with acetylene (3) to give tricarbonyl(η3:2-1,3-dimethyl-bicyclo[3.3.1]-3,6-nonadien-2-yl)manganese (4) and dicarbonyl(5-7,10-13-η-6,8-dimethyl-1,3,5,8,10,12-tridecahexaen-5-yl)manganese (5). The crystal structure of complex 4 was determined at room temperature [triclinic space group P1 ¯ , a=7.6891(9), b=8.3860(8), c=10.5252(13) Å, α=93.000(9)°, β=93.390(10)°, γ= 108.032(8)°, V=642.43(13) Å3]. The manganese atom is trigonal-bipyramidally coordinated by three carbonyl ligands, one ethenylic and one allylic fragment. Consequently, the bicyclic olefin ligand 1,3-dimethyl-bicyclo[3.3.1]-3,6-nonadiene coordinates the manganese atom in a η3:2 mode. The constitution of complex 5 was deduced from IR data, elemental analysis, and 1H NMR spectra. For the formation of complexes 4 and 5, a reaction mechanism is proposed.
    Zeitschrift fur Naturforschung B 02/2015; 70(2):143-150. DOI:10.1515/znb-2014-0227
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    ABSTRACT: A new series of fused 1,2,4-triazoles, namely 6-aryl-3-(furan-2-yl)-[1,2,4]triazolo[3,4-b][1,3,4]thiadiazoles 3a–h and 4a–f as well as 6-aryl-3-(furan-2-yl)-7H-[1,2,4]triazolo[3,4-b][1,3,4]thiadiazines 5a–h, were synthesized by the condensation of 4-amino-5-(furan-2-yl)-4H-1,2,4-triazole-3-thiol (2) with substituted aromatic acids and phenacyl bromides, respectively. The structures of the newly synthesized compounds were established using spectroscopic analysis, while that of 3e was confirmed independently by a single-crystal X-ray structure determination. The compounds were evaluated for their antiviral activity against the replication of HIV-1 and HIV-2 in MT-4 cells using an MTT assay. In a docking study, 4b interacted with several amino acids in the reverse transcriptase (RT) binding site of HIV-1. Some new analogues were selected for evaluation of their Eg5 inhibitory activity using an in vitro malachite green ATPase assay. The QSAR of these new analogues was studied as well.
    Zeitschrift fur Naturforschung B 01/2015; 70(1):47-58.
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    ABSTRACT: A new prenylated acridone alkaloid, medicacridone (1), and a new ferulate xanthone, medicaxanthone (5), together with 11 known compounds were isolated from the methanol extract of the bark of the Cameroonian medicinal plant Citrus medica. The structures of all compounds were determined by comprehensive analyses of their 1D and 2D NMR, mass spectral (EI and ESI) data, chemical reactions, and comparison with previously known analogues. The agar diffusion test delivered low to missing antimicrobial activities, corresponding with MICs > 1 mg mL–1, while compounds 1–6 and atalantoflavone (9) displayed weak cytotoxic activity against the human Caucasian prostate adenocarcinoma cell line PC-3, with IC50 values ranging from 60.5 to 80.0 μm versus doxorubicine with IC50=0.9 μm.
    Zeitschrift fur Naturforschung B 12/2014; 70(1):71-75.
  • Zeitschrift fur Naturforschung B 12/2014; DOI: 10.1515/znb-2014-0188.
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    ABSTRACT: The formation of self-assembled monolayers (SAMs) on Au(111) from solution has been investigated for two ionic iron(II) complexes of the type [Fe(L)](BF4)2, where L is tripodal hexadentate and contains three thiocyanate anchor groups. The ligands (L1, L2; donor set: N6) are obtained by Schiff base condensation of a tripodal triamine (L1: tris-(2-aminoethyl)amine, ‘tren’; L2: 1,1′,1′′-trimethyl(thiophosphoryl)trihydrazide) with 5-(4-thiocyanatobutoxy) pyridine-2-carbaldehyde. Layers of the complexes adsorbed on Au(111) from methanol solution have been characterised using scanning tunnelling microscopy (STM), infrared reflectance absorbance (IRRAS), X-ray photoelectron (XPS) and UV/Vis reflectance spectroscopies, as well as ellipsometry. Complex [Fe(L1)](BF4)2 deposits intact on a gold surface and retains its optical addressability. Elaboration of this result may provide access to a new class of self-assembled layers, employing salt-like tripodal coordination compounds with thiocyanate anchors. The second complex, [Fe(L2)](BF4)2, which contains a sulphur atom in the ligand backbone, is not sufficiently stable under the same conditions.
    Zeitschrift fur Naturforschung B 12/2014; 69(11-12):1164-1180. DOI:10.5560/ZNB.2014-4159
  • Zeitschrift fur Naturforschung B 10/2014; 2014(69b):605 - 614. DOI:10.5560/ZNB.2014-3324
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    ABSTRACT: An efficient synthesis of 1,2,3-functionalized imidazoles and dimethyl-2-[(alkoxycarbonyl)-anilino]-2-butenedioate derivatives via one-pot reactions between N-methylimidazole, dimethyl acetylenedicarboxylate and N-phenylcarbamates under solvent-free conditions is described. The mild reaction conditions and good yields exhibit the synthetic advantage of this method.
    Zeitschrift fur Naturforschung B 09/2014; 69(4):439. DOI:10.5560/ZNB.2014-3318
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    ABSTRACT: Reactions of a flexible fluorinated ligand, 2,3,5,6-tetrafluoro-1,4-bis(imidazol-1-yl-methyl)benzene (Fbix), with ZnX2 (X = OAc− or NO3–) lead to the formation of the two new ZnII coordination polymers [Zn(Fbix)(OAc)2]n (1) and {[Zn2(Fbix)3(NO3)2](NO3)2(H2O)3}n (2), which have been characterized by elemental analysis, IR spectroscopy, and single-crystal X-ray diffraction. Although the ZnII centers of both 1 and 2 are in a similar tetrahedral coordination geometry, each ZnII ion in 1 is surrounded by two Fbix spacers and two terminal OAc− anions to form a highly undulated chain, whereas each ZnII ion in 2 is embraced by three Fbix ligands and one NO3– anion to result in a two-dimensional cationic network. Since 1 and 2 are synthesized under the same conditions, the structural differences between them are attributable to the difference of the counterions. The solid-state properties such as thermal stability and luminescence of 1 and 2 have also been studied briefly.
    Zeitschrift fur Naturforschung B 08/2014; 69b(8):878 – 884. DOI:10.5560/ZNB.2014-4123
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    ABSTRACT: A neutral metal-organic framework [CoNa3(1,2,3-Hbtb)(1,2,3-btb)] (1) has been synthesized through an ionothermal method using 1-ethyl-3-methylimidazolium bromide as solvent (1,2,3-H(3)btb = 1,2,3-benzenetricarboxylic acid). The complex has been characterized by IR spectroscopy, elemental analysis, PXRD and single-crystal X-ray diffraction. The structure of 1 exhibits a layer network structure in which Co(II) is five-coordinated forming a distorted trigonal bipyramid. Na1 and Na3 are surrounded by seven oxygen atoms, and Na2 is six-coordinated. In the structure, the anions of 1,2,3-H(3)btb are embedded in two bridging mu(8) coordination modes. The luminescence properties of 1 have been investigated in the solid state at room temperature.
    Zeitschrift fur Naturforschung B 08/2014; 69b(8):864-870. DOI:10.5560/ZNB.2014-4091
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    ABSTRACT: The crystal structure of the antiviral drug rimantadine hydrochloride, C12H22N+ Cl−, has been elucidated by a single-crystal X-ray structure analysis. The structure consists of 1-(1-adamantyl)ethanamine (rimantadinium) cations and chloride anions. The Cl− anions link the rimantadinium cations via N–H···Cl hydrogen bonds into infinite rectangular chord-like structural units with charged groups in the inner channel and aliphatic groups on the surface, and oriented along the unit cell c axis. In contrast to strong electrostatic and hydrogen bonding inner interactions the chords in the crystal are held together by weak van der Waals forces only. A two-fold symmetry axis passes through the center of the chord. By indexing of the crystal faces it has been shown that the maximal dimension of the needle-like crystals coincides with the direction of the unit cell c axis. These structural features explain the crystal habit and the anisotropy of the mechanical properties of rimantadine hydrochloride crystals observed upon slicing and cleavage. Key words: Rimantadine Hydrochloride, Antiviral Drug, X-Ray Diffractometry, Crystallinity, Crystal Shape, Aspect Ratio
    Zeitschrift fur Naturforschung B 07/2014; 69b:823 – 828. DOI:10.5560/ZNB.2014-4075
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    ABSTRACT: In the present investigation, the key intermediate acetohydrazide derivative 5 was synthesized starting from 3-(4-methoxybenzyl)-4-amino-4,5-dihydro-1,2,4-triazol-5-one (1) by a four-step reaction. Thiosemicarbazides 6a–f and arylidenehydrazide derivatives 8a–d were obtained from compound 5. The cyclization of compounds 6a–f in the presence of NaOH resulted in the formation of compounds 7a–f. The compounds were characterized by IR, 1 H NMR, 13C NMR spectroscopy, elemental analysis and mass spectral studies. The compounds were tested for their anti-lipase, anti- α-glucosidase and anti-mycobacterial activities. Compounds 6b and 8c exhibited excellent anti-lipase activity, and compound 8d showed excellent anti- α-glucosidase activity. Compounds 3 and 4 exhibited good antituberculosis activity.
    Zeitschrift fur Naturforschung B 06/2014; 69b:969 – 981. DOI:10.5560/ZNB.2014-4126
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    ABSTRACT: The title compound was isolated from the treatment of Tp*Sn(Cl)(2)Bu (1) with a large excess of sodium hydroxide in a mixture of acetone-water at room temperature. [(Me2CO)(3)(NaTp*)(2)] (2) crystallizes at 4 degrees C as prismatic colorless crystals, in the monoclinic space group P2(1)/c with Z = 4, a = 12.2837(6), b = 24.3197(12), c = 16.9547(8) angstrom, beta = 110.017(1)degrees, and V = 4759.0(4) angstrom(3). The X-ray crystallographic analysis revealed a dinuclear unit in which two Tp*Na moieties are held together by three bridging acetone molecules acting as oxygen-based donors.
    Zeitschrift fur Naturforschung B 06/2014; 69b(7):793-798. DOI:10.5560/ZNB.2014-4066
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    ABSTRACT: A series of dipeptide heterocyclic derivatives 4–15 were synthesized using methyl 2-{[(1-ethyl- 7-methyl-4-oxo-1,4-dihydro-1,8-naphthyridin-3-yl)carbonyl]amino}-3-ethylbutanoate (3) as starting material. Treatment of 3 with L-phenylalanine methyl ester hydrochloride afforded the corresponding dipeptide methyl ester derivative 4, which was treated with hydrazine hydrate to afford the dipeptide acid hydrazide 5. Compound 5 was coupled with aldehyde and acetophenone derivatives to afford the corresponding Schiff bases 6a–f. The hydrazide derivative 5 was reacted with ethyl acetoacetate or acetone to give compounds 7 and 8, respectively. Reaction of 5 with carbon disulfide at different conditions afforded compounds 9 and 10, which were treated with hydrazine hydrate to give the 1-amino-2-dipeptido-1,3,4-triazole derivative 11. In addition, 5 was reacted with phenyl isothiocyanate to give the thiosemicarbazide derivative 12, which was cyclized with sodium hydroxide to the dipeptido 1-phenyl-1,3,4-triazole derivative 13. Finally, treatment of 13 with methyl iodide afforded the S-methyl derivative 14, which was reacted with hydrazine hydrate to give the hydrazine derivative 15.
    Zeitschrift fur Naturforschung B 06/2014; 69(6):728 – 736. DOI:10.5560/ZNB.2014-4031