Search results for "yhdisteet"

A handy and accessible tool for identification of Sn(II) in toothpaste.

2021

AbstractAn easily accessible colorimetric probe, a carbazole–naphthaldehyde conjugate (CNP), was successfully prepared for the selective and sensitive recognition of Sn(II) in different commercially-available toothpaste and mouth wash samples. The binding mechanism of CNP for Sn2+ was confirmed by UV–Vis, 1H, and 13C NMR titrations. The proposed sensing mechanism was supported by quantum chemical calculations. Selective detection of Sn(II) in the nanomolar range (85 nM), among other interfering metal ions, makes it exclusive. Moreover, Sn2+ can be detected with a simple paper strip from toothpaste, which makes this method handy and easily accessible. The potential application of this system…

Cleavage of Ge–Ge and Sn–Sn Triple Bonds in Heavy Group 14 Element Alkyne Analogues (EAriPr4)2 (E = Ge, Sn; AriPr4 = C6H3-2,6(C6H3-2,6-iPr2)2) by Rea…

2016

The reactions of heavier group 14 element alkyne analogues (EAriPr4)2 (E = Ge, Sn; AriPr4 = C6H3-2,6-(C6H3-2,6-iPr2)2) with the group 6 transition-metal carbonyls M(CO)6 (M = Cr, Mo, W) under UV irradiation resulted in the cleavage of the E–E triple bond and the formation of the complexes {AriPr4EM(CO)4}2 (1–6), which were characterized by single crystal X-ray diffraction as well as by IR and multinuclear NMR spectroscopy. Single-crystal X-ray structural analyses of 1–6 showed that the complexes have a nearly planar rhomboid M2E2 core with three-coordinate group 14 atoms. The coordination geometry at the group 6 metals is distorted octahedral formed by four carbonyl groups as well as two br…

An experimental and theoretical study of a heptacoordinated tungsten(VI) complex of a noninnocent phenylenediamine bis(phenolate) ligand

2018

Abstract [W(N2O2)(HN2O2)] (H4N2O2 = N,N′-bis(3,5-di-tert-butyl-2-hydroxyphenyl)-1,2-phenylenediamine) with a noninnocent ligand was formed by reaction of the alkoxide precursor [W(eg)3] (eg = the 1,2-ethanediolate dianion) with two equivalents of ligand. The phenol groups on one of the ligands are completely deprotonated and the ligand coordinates in a tetradentate fashion, whereas the other ligand is tridentate with one phenol having an intact OH group. The molecular structure, magnetic measurements, EPR spectroscopy, and density functional theory calculations indicate that the complex is a stable radical with the odd electron situated on the tridentate amidophenoxide ligand. The formal ox…

Haitalliset kaasut työilmassa : kemialliset ominaisuudet ja määritysmenetelmät

2007

Puun typpiyhdisteet sekä niiden haihtuvien reaktiotuotteiden muodostumiseen vaikuttavat tekijät sulfaattiprosessissa

2008

Effects of organic material on the bioavailability, toxicokinetics and toxicity of xenobiotics in freshwater organisms

2001

Pohjoisille ekosysteemeille tyypillinen runsas orgaanisen aineksen määrä joko liuenneena vedessä tai järvien pohjamudassa voi sitoa useita kemiallisia saasteita ja siten vähentää eliöiden altistumista niille sekä siitä syntyviä myös koko ekosysteemille haitallisia vaikutuksia. Anna Nikkilän tutkimuksessa havaittiin, että orgaaninen aines voi vähentää merkittävästi harvasukamadon sekä vesikirpun altistumista tietyille rasvaliukoisille ympäristömyrkyille aromaattisten monirenkaisten hiilivetyjen (pyreeni, reteeni) sekä kloorifenolien (2,4,5-trikloorifenoli, pentakloorifenoli) ryhmistä. Osa tutkituista yhdisteistä sitoutui orgaaniseen ainekseen eikä näin ollut eliöille altistavassa muodossa. V…