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Group P. (group + p)

Distribution by Scientific Domains
Chemistry85%

Kinds of Group P.

  • space group p.
    		•

    Selected Abstracts

    Change in Vasoconstrictive Function During Prolonged Nonpulsatile Left Heart Bypass

    ARTIFICIAL ORGANS, Issue 5 2001
    Tomohiro Nishinaka
    Abstract: We investigated changes in vasoconstrictive function accompanying prolonged nonpulsatile left heart bypass (NLHB). After 2-week pulsatile left heart bypass (PLHB) in 11 goats, NLHB was conducted for another 4 weeks (Group N) in 6 goats. In the other 5 goats, PLHB was continued for another 4 weeks (Group P). Systemic vascular resistance at rest (rSVR) was measured on the last days of the second and sixth postoperative week (W2 and W6, respectively). Subsequently, phenylephrine was injected, and the maximum values (SVRmax) and the maximum increasing change in SVR (,SVR) were measured. No significant difference was observed in rSVR between groups at W2 or W6. The SVRmax and the ,SVR at W2 were consistent in both groups. However, at W6, the SVRmax and the ,SVR of Group N were significantly lower than those of Group P. In conclusion, prolonged NLHB caused a significant decrease in the SVR response to phenylephrine, indicating a dimunition of vasoconstrictive function. [source]

    Antimony Amide Oxide and Antimony Chloride Oxide Wrapped in an Organoaluminum Framework

    EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 7 2008
    Sanjay Singh
    Abstract Syntheses of trimetallic aluminum and antimony compounds containing an Al2O2SbN and an Al2O2SbCl core in [LAl(Me)(,-O)]2Sb(NMe2) and [LAl(Me)(,-O)]2SbCl, respectively, are reported. The former compound represents an example of an amide oxide of antimony and the latter is an example of a chloride oxide of antimony incorporated in an organoaluminum framework which in turn is supported by a sterically encumbered ,-diketiminate ligand L {L = HC[C(Me)N-2,6- iPr2C6H3]2}. The solid-state structure of [LAl(Me)(,-O)]2Sb(NMe2) was elucidated by the aid of single-crystal X-ray diffraction technique which shows the molecule to crystallize in the triclinic space group P. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008) [source]

    Highly Symmetrical Tetranuclear Cluster Complexes Supported by p - tert -Butylsulfonylcalix[4]arene as a Cluster-Forming Ligand

    EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 9 2006
    Takashi Kajiwara
    Abstract Square-planar tetranuclear clusters [M4(L)(AcO)4(,4 -OH)], (M = MnII, CoII, and NiII) are synthesized using tetra-anionic p - tert -butylsulfonylcalix[4]arene (L4,) as a cluster-forming ligand. Three complexes are crystallographically isostructural, being crystallized in the triclinic crystal system with space group P. The calix[4]arene acts as a tetrakis fac -tridentate ligand through four phenoxo and four sulfonyl oxygen atoms to form square arrangement of four metal ions, which are further bridged by four chelating acetate ions and one hydroxo ion in a ,4 manner to complete the hexacoordination of each metal center. Although the whole molecule of each complex is crystallographically independent, the molecule is highly symmetrical with a pseudo-four-fold axis lying on the ,4 -OH, group. The tetranuclear clusters are stable enough to maintain the core structures even in highly dilute solution (,10 ,M), which was confirmed by mass spectroscopic study, however, bridging acetates were easily exchanged by other carboxylate chelates to form derivatives such as [M4(L)(BzO)4(OH)],. Metal,metal interactions were investigated by means of magnetic susceptibility, and it was revealed that both ferro- and antiferromagnetic interactions occur in the NiII complex depending on the bridging angles of Ni,O,Ni. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006) [source]

    Hydrogen-bonding patterns in 3-alkyl-3-hydroxyindolin-2-ones

    ACTA CRYSTALLOGRAPHICA SECTION C, Issue 2 2010
    Diana Becerra
    The molecules of racemic 3-benzoylmethyl-3-hydroxyindolin-2-one, C16H13NO3, (I), are linked by a combination of N,H...O and O,H...O hydrogen bonds into a chain of centrosymmetric edge-fused R22(10) and R44(12) rings. Five monosubstituted analogues of (I), namely racemic 3-hydroxy-3-[(4-methylbenzoyl)methyl]indolin-2-one, C17H15NO3, (II), racemic 3-[(4-fluorobenzoyl)methyl]-3-hydroxyindolin-2-one, C16H12FNO3, (III), racemic 3-[(4-chlorobenzoyl)methyl]-3-hydroxyindolin-2-one, C16H12ClNO3, (IV), racemic 3-[(4-bromobenzoyl)methyl]-3-hydroxyindolin-2-one, C16H12BrNO3, (V), and racemic 3-hydroxy-3-[(4-nitrobenzoyl)methyl]indolin-2-one, C16H12N2O5, (VI), are isomorphous in space group P. In each of compounds (II),(VI), a combination of N,H...O and O,H...O hydrogen bonds generates a chain of centrosymmetric edge-fused R22(8) and R22(10) rings, and these chains are linked into sheets by an aromatic ,,, stacking interaction. No two of the structures of (II),(VI) exhibit the same combination of weak hydrogen bonds of C,H...O and C,H...,(arene) types. The molecules of racemic 3-hydroxy-3-(2-thienylcarbonylmethyl)indolin-2-one, C14H11NO3S, (VII), form hydrogen-bonded chains very similar to those in (II),(VI), but here the sheet formation depends upon a weak ,,, stacking interaction between thienyl rings. Comparisons are drawn between the crystal structures of compounds (I),(VII) and those of some recently reported analogues having no aromatic group in the side chain. [source]

    A new bismuth iron oxyphosphate, Bi6(Bi0.32Fe0.68)(PO4)4O4

    ACTA CRYSTALLOGRAPHICA SECTION C, Issue 8 2008
    Nachiappan Arumugam
    Iron was inserted into the known crystal structure of the bismuth phosphate oxide Bi6.67(PO4)4O4 to ascertain its location in the vacancies associated with the bismuth ion located at the origin of the unit cell. Single-crystal X-ray diffraction refinements converged to a model of composition Bi6(Bi0.32Fe0.68)(PO4)4O4 (hexabismuth iron tetraphosphate tetraoxide), in which Bi and Fe are displaced from the origin giving rise to a random distribution over the 2i sites instead of 1a, the origin of space group P. The isotropic displacement parameter for Bi/Fe has a reasonable value in this model. This structure establishes for the first time that Fe substitutes in the Bi-deficient site in this series of materials and that Fe and Bi are disordered around the center of symmetry. These results enhance understanding of the crystal chemistry of these main group phosphates that are of interest in ion transport. [source]

    (Z)-1-Ferrocenyl-3-(3-hydroxy­anilino)­but-2-en-1-one and (Z)-1-ferrocenyl-3-(4-hydroxy­anilino)­but-2-en-1-one

    ACTA CRYSTALLOGRAPHICA SECTION C, Issue 9 2006
    Yao-Cheng Shi
    The title compounds, both [Fe(C5H5)(C15H14NO2)], crystallize with Z, = 2 in the centrosymmetric space group P. In each compound, there is an intra­molecular N,H,O=C hydrogen bond, and pairs of inter­molecular O,H,O=C hydrogen bonds link the mol­ecules into chains, parallel to [10] in the 3-hydr­oxy compound and parallel to [10] in the 4-hydr­oxy compound. [source]

    Trimethyl[3-methyl-1-(o -tolenesulfonyl)indol-2-ylmethyl]ammonium iodide and benzyl[3-bromo-1-(phenylsulfonyl)indol-2-ylmethyl]tolylamine

    ACTA CRYSTALLOGRAPHICA SECTION C, Issue 12 2002
    P. R. Seshadri
    The title compounds, C20H25N2O2S+·I,, (I), and C29H25BrN2O2S, (II), respectively, both crystallize in space group P. The pyrrole ring subtends an angle with the sulfonyl group of 33.6° in (I) and 21.5° in (II). The phenyl ring of the sulfonyl substituent makes a dihedral angle with the best plane of the indole moiety of 81.6° in (I) and 67.2° in (II). The lengthening or shortening of the C,N bond distances in both compounds is due to the electron-withdrawing character of the phenyl­sulfonyl group. The S atoms are in distorted tetrahedral configurations. The molecular structures are stabilized by C,H,O and C,H,I interactions in (I), and by C,H,O and C,H,N interactions in (II). [source]