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The asymmetric unit contains one-half of the complex molecule and one lattice water molecule. The ligand<jats:italic>L<\/jats:italic>exists in a zwitterionic form, with a positive charge on the NH<jats:sub>3<\/jats:sub>group and a negative charge on the O atom of the non-coordinating phosphonate group, and with an intramolecular O\u2014H...O interaction forming an<jats:italic>S<\/jats:italic>(6) ring motif and two intramolecular N\u2014H...O interactions each generating an<jats:italic>S<\/jats:italic>(5) ring motif. In the crystal, N\u2014H...O and O\u2014H...O hydrogen bonds link the complex molecules into a three-dimensional network in which the voids of 38\u2005\u00c5<jats:sup>3<\/jats:sup>are filled with ordered lattice water molecules, which are also involved in O\u2014H...O hydrogen bonding.<\/jats:p>","DOI":"10.1107\/s2056989015004028","type":"journal-article","created":{"date-parts":[[2015,3,6]],"date-time":"2015-03-06T09:18:21Z","timestamp":1425633501000},"page":"342-345","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":1,"title":["Crystal structure of bis[(1-ammonio-1-phosphonoethyl)phosphonato]tetraaquacadmium dihydrate: a powder X-ray diffraction study"],"prefix":"10.1107","volume":"71","author":[{"given":"Mwaffak","family":"Rukiah","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Thaer","family":"Assaad","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"329","published-online":{"date-parts":[[2015,3,7]]},"reference":[{"key":"cv5484_bb1","doi-asserted-by":"crossref","first-page":"1231","DOI":"10.1107\/S0021889813013113","volume":"46","author":"Altomare","year":"2013","journal-title":"J. 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