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Träfflista för sökning "WFRF:(Wendt N) srt2:(2000-2004)"

Sökning: WFRF:(Wendt N) > (2000-2004)

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1.
  • Kuznik, N, et al. (författare)
  • The trans effect and trans influence of triphenyl arsine in platinum(II) complexes. A comparative mechanistic and structural study
  • 2002
  • Ingår i: Journal of the Chemical Society. Dalton Transactions. - : Royal Society of Chemistry (RSC). - 1472-7773 .- 1364-5447. ; :15, s. 3074-3078
  • Tidskriftsartikel (refereegranskat)abstract
    • The kinetics and mechanism of the reaction between [PtI3(AsPh3)](-) and pyridine in acetonitrile solvent has been studied by use of stopped-flow spectrophotometry. Substitution of iodide trans to arsine is irreversible under the conditions used and takes place via parallel direct and solvolytic pathways. By comparing the rate constants of the direct pathway with literature values of the corresponding phosphine and stibine complexes the following trans effect series can be obtained: Ph3Sb > Ph3P > Ph3As. The crystal and molecular structures of reactant and product have been determined. Based on Pt-I distances for the investigated arsine complex and literature data for the corresponding phosphine and stibine complexes the following trans influence series was derived: Ph3P greater than or equal to Ph3As > Ph3Sb. To the best of our knowledge this is the first comparison of all the three heavier pnictogens as donor atoms using strictly analogous complexes with identical cis-ligands.
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3.
  • Sajaniemi, N., et al. (författare)
  • Early cognitive and behavioral predictors of later performance : A follow-up study of ELBW children from ages 2 to 4
  • 2001
  • Ingår i: Early Childhood Research Quarterly. - 0885-2006 .- 1873-7706. ; 16:3, s. 343-361
  • Tidskriftsartikel (refereegranskat)abstract
    • The aim of this study was to examine whether behavioral style and cognitive performance predict cognitive development in ELBW children. The children were assessed at age 2 (40 girls, 41 boys) with the Bayley Scales of Infant Development. At age 4 they were assessed with the WPPSI-R, and with the word fluency, visual attention and recognition of incomplete figures subsets of the Finnish Neuropsychological Investigation for Children (NEPSY-R, Korkman et al. 1997). The results indicated that there was stability in cognitive performance from 2 to 4 years of age. Along with cognitive performance, behavioral style, especially orientation-engagement at age 2, was an important predictor of subsequent cognitive performance (WPPSI-R). Significant gender differences were also found. For boys, orientation-engagement factor at time one was the best predictor of subsequent nonverbal cognitive performance, arithmetical abilities and word fluency at time two. In contrast, girls' cognitive performance measured at the 2-year assessment was the most powerful predictor of nonverbal performance and word fluency at 4 years. As a whole, it seems that behavioral factors merit more consideration in understanding cognitive development than has been thought before. © 2001 Elsevier Science Inc.
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