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The spectra showed that cP<jats:sub>3<\/jats:sub>O<jats:sub>9\u2212<jats:italic>n<\/jats:italic><\/jats:sub>(NH)<jats:italic><jats:sub>n<\/jats:sub><\/jats:italic> (<jats:italic>n<\/jats:italic>\u2009=\u20091, 2) ligands form ML, ML<jats:sub>2<\/jats:sub>, and M<jats:sub>2<\/jats:sub>L complexes with Be<jats:sup>2+<\/jats:sup> ions, and the formation of complexes coordinating with nitrogen atoms of the cyclic framework in the ligand molecule has been excluded. These complexation trends are very similar to those of Be<jats:sup>2+<\/jats:sup>\u2010cP<jats:sub>3<\/jats:sub>O<jats:sub>6<\/jats:sub>(NH)<jats:sub>3<\/jats:sub><jats:sup>3\u2212<\/jats:sup> system, which has been reported by us. The peak deconvolution of <jats:sup>9<\/jats:sup>Be NMR spectra made these beryllium complexes amenable to stability constant determinations. The stability constants of the complexes increase with an increase in the protonation constants of the ligands as the number of imino groups, which constitute the ligand molecules, is ascended. This increase is primarily attributable to the lower electronegativity of nitrogen atoms than oxygen atoms, which are directly bonded to central phosphorus atoms; moreover, tautomerism equilibrium in the entire of the imidopolyphosphate molecule is also responsible to the higher basicity. <jats:sup>31<\/jats:sup>P NMR spectra measured concurrently have verified the formation of the complexes estimated by the <jats:sup>9<\/jats:sup>Be NMR measurement. Intrinsic <jats:sup>31<\/jats:sup>P NMR chemical shift values of the phosphorus atoms belonging to ligand molecules complexed with Be<jats:sup>2+<\/jats:sup> cations have been determined. Not only the protonation constants but also the stability constants of all Be<jats:sup>2+<\/jats:sup> complexes increase approximately linearly with an increase in the number of imino groups. Copyright \u00a9 2013 John Wiley &amp; Sons, Ltd.<\/jats:p>","DOI":"10.1002\/mrc.4037","type":"journal-article","created":{"date-parts":[[2013,12,17]],"date-time":"2013-12-17T01:35:35Z","timestamp":1387244135000},"page":"69-81","source":"Crossref","is-referenced-by-count":7,"title":["<sup>9<\/sup>Be and <sup>31<\/sup>P NMR analyses on the influence of imino groups on Be<sup>2+<\/sup> complex stabilities of a series of <i>cyclo\u2010\u03bc<\/i>\u2010imido triphosphate anions"],"prefix":"10.1002","volume":"52","author":[{"given":"Hideshi","family":"Maki","sequence":"first","affiliation":[{"name":"Department of Chemical Science and Engineering, Graduate School of Engineering Kobe University  1\u20101 Rokkodai\u2010cho, Nada\u2010ku Kobe 657\u20108501 Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Masahiko","family":"Tsujito","sequence":"additional","affiliation":[{"name":"Department of Chemical Science and Engineering, Graduate School of Engineering Kobe University  1\u20101 Rokkodai\u2010cho, Nada\u2010ku Kobe 657\u20108501 Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hiroyuki","family":"Nariai","sequence":"additional","affiliation":[{"name":"Department of Chemical Science and Engineering, Graduate School of Engineering Kobe University  1\u20101 Rokkodai\u2010cho, Nada\u2010ku Kobe 657\u20108501 Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Minoru","family":"Mizuhata","sequence":"additional","affiliation":[{"name":"Department of Chemical Science and Engineering, Graduate School of Engineering Kobe University  1\u20101 Rokkodai\u2010cho, Nada\u2010ku Kobe 657\u20108501 Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2013,12,17]]},"reference":[{"key":"e_1_2_5_2_1","series-title":"Special publication No. 25","volume-title":"Stability Constants of Metal\u2010ion Complexes","author":"Sill\u00e9n L. 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