TY - JOUR A1 - Hägele, Gerhard A1 - de Sousa Amadeu, Nader A1 - Augner, Sven A1 - Widler, Leo A1 - Janiak, Christoph T1 - Symmetric geminal bisphosphinic acids RR´C[P(CH3)(O)OH]2 - NMR and analytical studies N2 - Four bisphosphinic acids RR´C[P(CH3)(O)OH]2 are characterized by 1H, 13Cf1Hg, and 31P{1H} NMR data. H3C-P-C-P-CH3 skeletons give rise to [A3X]2 spin systems. Some algebraic equations are derived for manual analysis of [A3X]2 spectra. HR NMR data for heteroaromatic substituents R in RC(H)[P(CH3)(O)OH]2 are reported. Dissociation constants and ion-specific chemical shifts dP of CH3C(OH)[P(CH3)(O)OH]2 are determined by 31P{1H} NMR controlled titrations of 2a. KW - Biphosphinic acid J-Coupling KW - High resulution NMR PY - 2020 DO - https://doi.org/10.1080/10426507.2020.1798444 VL - 195 IS - 12 SP - 1013 EP - 1026 PB - Taylor & Francis AN - OPUS4-61861 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -