Lower rim-modified calix[4]arenes with fragments of EDTA (DTPA) and their Ln(III) complexes (Ln = Yb, Lu): synthesis and NIR-luminescent properties

Derivatives of p-tert-butylcalix[4]arene substituted on the lower rim with fragments of aminopolycarboxylic acids (EDTA, DTPA) were obtained. Mono and binuclear complexes with lanthanide (III) ions were synthesized using these compounds. The effect of the number and type of aminopolycarboxylic acid fragments on the luminescence of ligands and complexes was studied. The influence of the distance between the emitting ion and the calixarene macrocycle on the intensity of 4f-luminescence was analyzed.

Preparation of polycarboxylic acid-functionalized silica supported Pt catalysts and their applications in alkene hydrosilylation

Three novel Pt catalysts were prepared by loading Pt onto aminopolycarboxylic acid functionalized silica gel and were used in alkene hydrosilylation.

Identification of a novel aminopolycarboxylic acid siderophore gene cluster encoding the biosynthesis of ethylenediaminesuccinic acid hydroxyarginine (EDHA)

A computational screening approach enabled the detection of a novel aminopolycarboxylic acid gene cluster that encodes the biosynthesis of EDHA.

Spectrophotometric Determination of Cu2+ Metal Ions via Complex Formation with Carboxylated Tris(2-aminoethyl)amine

An aminopolycarboxylic acid chelating agent; tris(2-aminoethyl)aminehexaacetic acid (TAHA) was prepared and characterized. TAHA formed stable complexes with Cu(II) ions and other metal ions at pH 10. The complexation behavior was studied by spectrophotometry at the complex maximum wavelength. Mixtures of Cu(II) and other metal ions (M2+; Ca2+, Co2+, Ni2+, Cd2+)were titrated with TAHA at pH 10. The stoichiometry of ligand - to - metal was found to be 1:1. The stability constant of Cu(II)–TAHA complex was determined to be 1.86×105 by using the continuous variation method. Beer’s law was obeyed over the concentration range 3.0×10–4 M – 1.2×10–2 M for Cu(II) solution. The results of the quantitative determination of Cu(II) gave LOD and LOQ values of 7.285×10–6 M and 2.428×10–5 M respectively. The percent relative standard deviation (%RSD) for five replicate samples was found to be 1.088% and 4.804% for Cu(II) concentrations of 1.2×10–2 M and 3.0×10–4 M respectively.