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  • 1
    Electronic Resource
    Electronic Resource
    Specific interaction of the triethylammonium ion with substituted pyridines in nitrobenzene and inortho-Dichlorobenzene (1975)
    Springer
    Journal of solution chemistry 4 (1975), S. 853-862 
    Details
    ISSN: 1572-8927
    Keywords: Cations ; complexation constants ; conductivity ; Hammett relations ; ligands ; nitrobenzene ; ortho-dichlorobenzene ; pyridines ; triethylammonium picrate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The dissociation constants Kd of triethylammonium picrate have been determined from conductimetric measurements in nitrobenzene (NB) and in ortho-dichlorobenzene (ODCB) with and without pyridines being used as ligands. In the absence of any ligand, the enhancement of the dissociation in NB as compared with that in ODCB cannot be explained solely by the increase of the dielectric constant, but shows the existence of specific interactions of the former solvent with the ions. The results obtained in the presence of ligands are consistent with the formation of a 1:1 cation-pyridine hydrogen-bonded complex. The constantk 1 + for the formation of theis complex has been determined for six substituted pyridines in both solvents. Logk 1 + varies linearly with the Hammett parameter σH of the substituent. The slope ρ of the Hammett relation is −1.86 in NB and −2.90 in ODCB. The difference can be ascribed to specific interactions between NB and the pyridines which become stronger when the pyridine is more basic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00649877
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  • 2
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    Erylus toxiformis (Porifera, Geodiidae), a new species from the southwestern Atlantic (1999)
    In:  Beaufortia vol. 49 no. 4, pp. 29-33
    Details
    Publication Date: 2024-01-12
    Description: A new species of Erylus (Porifera, Geodiidae) from the southwestern Atlantic, Erylus toxiformis n. sp. is described off Rio Grande do Sul coast, Brazil.
    Keywords: Porifera ; Demospongiae ; Geodiidae ; Erylus toxiformis n.sp. ; southwestern Atlantic ; taxonomy
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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  • 3
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    Stelletta hajdui, a new species from the southwestern Atlantic (Porifera, Choristida, Ancorinidae) (1999)
    In:  Bulletin Zoologisch Museum vol. 16 no. 12, pp. 85-88
    Details
    Publication Date: 2024-01-12
    Description: A new species of Stelletta from the southwestern Atlantic, Stelletta hajdui sp.n. is described from the slope off Rio Grande do Sul State coast, Brazil (32\xc2\xb024\'S, 50\xc2\xb015\'W) (Fig.1). The material studied was dredged up at the depth of 200m by the R/V Atl\xc3\xa2ntico Sul, during \xe2\x80\x9cProjeto Talude\xe2\x80\x9d run by Funda\xc3\xa7\xc3\xa3o Universidade de Rio Grande (FURG). A key to the Brazilian Stelletta sponges is provided.
    Keywords: Porifera ; Choristida ; Ancorinidae ; southwestern Atlantic ; taxonomy
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 4
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    A new species of Erylus Gray, 1867 (Porifera, Geodiidae) from the southeastern coast of Brazil (2001)
    In:  Beaufortia vol. 51 no. 4, pp. 83-89
    Details
    Publication Date: 2024-01-12
    Description: A new species, Erylus soesti n. sp. is described from SE Brazil. This study is part of an ongoing revision of genus Erylus Gray, 1867 (Mothes, Lerner & Da Silva, 1999; Mothes & Lerner, 1999) and adds a further brazilian species to the genus. This new species can be distinguished by the possession of dichotriaenes, oxeas, and peculiar cushion-like aspidasters with extremely irregular outline, microspined microstrongyles and sphaeroxyasters. A key for identification of brazilian species is provided.
    Keywords: Porifera ; Geodiidae ; Erylus soesti n. sp. ; Brazil ; taxonomy
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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