200629-71-6Relevant academic research and scientific papers
Synthesis, characterization, and bioactivities of platinum(II) complexes bearing pyridinecarboxaldimines containing aliphatic groups
Stewart, Erin L.,Patterson, Alyssa E.,O'Neill, Taryn,Li, Haoxin,Flewelling, Andrew,Vogels, Christopher M.,Decken, Andreas,Lloyd, Vett K.,Gray, Christopher A.,Westcott, Stephen A.
, p. 131 - 136 (2013)
Condensation of 2-pyridinecarboxaldehyde with six primary amines containing aliphatic groups gave the corresponding pyridinecarboxaldimines (N-N′R). Addition of these ligands to [PtCl2(coe)]2 (coe = cis-cyclooctene) gave complexes of the type cis-PtCl2(N-N′R) (1: R = propyl, 2: R = hexyl, 3: R = octyl, 4: R = nonyl, 5: R = hexadecyl, and 6: R = octadecyl) in moderate yields. The molecular structure of the hexyl derivative (2) has been confirmed by an X-ray diffraction study. Crystals of 2 were triclinic with a = 8.6858(19) A, b = 8.7567(19) A, c = 9.5080(19) A, α = 76.546(3), β = 87.151(3), and γ = 78.586(3) in the space group P1. All platinum complexes show considerable anti-bacterial and anti-mycobacterial properties.
Room temperature atom transfer radical polymerization of glycidyl methacrylate mediated by copper(I)/N-alkyl-2-pyridylmethanimine complexes
Krishnan,Srinivasan
, p. 3614 - 3622 (2004)
The homogeneous controlled/"living" free radical polymerization of glycidyl methacrylate (GMA) by atom transfer radical polymerization (ATRP) using Cu(I)X/N-alkyl-2-pyridylmethanimine complexes with various initiators R-X (X = Cl, Br) and solvents was investigated. Most of these systems display characteristics of a living radical polymerization as indicated by (a) linear first-order kinetic plots of ln[M]0/[M] vs time, (b) an increase in the number-average molecular weight (Mn) vs conversion, and (c) relatively narrow polydispersities indicating a constant number of propagating species throughout the polymerization with negligible contribution of termination or transfer reactions. The dependence of the rate of polymerization on the concentrations of initiator, ligand, and temperature is presented. We observed comparable rates of polymerization linear increase of molecular weight with conversion and low polydispersities in polar solvents. No polymerization was observed in nonpolar solvents such as toluene and xylene at room temperature. The order of controlled polymerization with different initiator system is CuBr/BPN > CuCl/BPN > CuBr/ClPN, and the polymerization did not proceed with CuCl/ClPN initiator system at room temperature. The high functionality of bromine end groups present in the polymer chains was confirmed by ESI MS analysis. The thermal stability of PGMA prepared by the CuBr/PPMI/BPN initiation system is higher than by the other three systems, indicating the high regioselectivity and the virtual absence of termination reactions in the former case. The ligand alkyl chain length from R = propyl to octyl did not affect the rate of polymerization. The molecular weight (Mn) increases linearly with conversion, and these polymers showed narrow polydispersities.
Investigation of the Range of a Plastic pH Sensor Based on a Dibasic Ionophore
Cardwell, Terence J.,Cattrall, Robert W.,Deady, Leslie W.,Murphy, Kathryn A.
, p. 435 - 438 (2007/10/02)
A study is reported of the use of a neutral carrier reagent containing two nitrogen atoms with very different basicities in a pH-sensitive membrane electrode with a view to obtaining a broad response range.This electrode responds well in the pH region of 6-12 but suffers anion interference in the region of pH 2-6.A study is included of the effect of adding various amounts of potassium tetrakis(4-chlorophenyl)borate as an anion suppressing reagent to the membrane in order to reduce the anion interference at low pH values.The conclusion is drawn that an extension to the working pH range is not possible with this approach unless controlled amounts of anion suppressing reagent can be provided to approximately balance the positive charge of the carrier in each region of the pH scale.
