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metal-organic compounds
The crystal structure of the title compound, Na+.C15H14NO7P2-.H2O, consists of zwitterionic olpadronate anions coordinated to Na+ cations. The interactions in the crystal define broad chains which have Na+ ions at their core and bisphosphonate groups near the Na+ centres, with the positively charged ends of the zwitterions extending outwards. Strong hydrogen bonds provide both intra- and interchain connectivity.