Bis(nitrato‐κ 2 O,O ′)(1,4,7,10,13‐pentaoxacyclopentadecane)calcium(II)

The crystal structure of the title compound, [Ca(NO 3 ) 2 (C 10 H 20 O 5 )], at 120 K contains discrete molecules with nine‐coordinate Ca atoms. There are two molecules in the asymmetric unit, related by a pseudo‐inversion centre. The crown bonds through five O atoms [Ca—O = 2.464 (2)–2.567 (2) Å] and the nitrates are bidentate [Ca—O = 2.444 (2)–2.588 (2) Å]. The structure is a polymorph of a previously reported room‐temperature form.