165273-23-4Relevant academic research and scientific papers
Phosphorylated diazacycloalkanes: Synthesis and study of complexes with neodymium(III) and copper(II) nitrates
Matrosov,Matveev,Matveeva,Nifant'ev
, p. 523 - 529 (2008/10/09)
Neodymium(III) and copper(II) coordination compounds with cyclopendant organophosphorus ligands based on diazacycloalkanes, namely, 1-methyl-4-(2-diphenylphosphorylethyl)piperazine (L1), 1,4-bis(2-diphenylphosphorylethyl)piperazine (L2), and 1,5-bis(2-diphenylphosphorylethyl)diazacyclooctane (L3), were synthesized. The IR spectra of the complexes were studied, and fundamental main frequencies of coordinated L1-L3 were assigned. Ligands L1-L3 are coordinated in all complexes through both nitrogen atoms of the ring, while the potential coordination of the oxygen atoms of the P=O group does not always occur. The structure of the synthesized complexes was suggested on the basis of IR-spectroscopy data and conformational analysis (molecular mechanics).
Synthesis and acid-base properties of phosphorylated diazocycloalkanes and their cyclic analogs
Matveev, S. V.,Matveeva, A. G.,Matrosov, E. I.,Shcherbakov, B. K.,Polikarpov, Yu. M.,Kabachnik, M. I.
, p. 1895 - 1901 (2007/10/02)
Novel cyclopendant organophosphorus complexing agents, viz. 1,5-bis(2-diphenylphosphorylmethyl(or ethyl))-1,5-diazacyclooctane (1, 2) and 1-methyl-4-(2-diphenylphosphorylethyl)piperazine (3), were synthesized on the basis of 1,5-diazacyclooctane and piperazine.The protonation constants of the compounds synthesized and some of their analogs were determined by potentiometric titration in 70percent aqueous ethanol and in nitromethane. the nitrogen atoms of the ring are the protonation sites in all of the systems studied.The regularities of the variation of protonation constants have been explained by the formation of intramolecular hydrogen bonds.The conformational possibilities of the formation of H-bonds in the cations of the ligands have been examined by molecular mechanics. - Key words: cyclopendant ligands, phosphorylated diazacycloalkanes, protonation constants, potentiometric titration, intramolecular hydrogen bonds, conformational analysis.
