✦ LIBER ✦

Synthesis, Characterization, and Crystal Structure of the Lactone Form of Rhodamine B

✍ Scribed by Xiqing Wang; Maoying Song; Yingcai Long

Publisher: Elsevier Science
Year: 2001
Tongue: English
Weight: 237 KB
Volume: 156
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.2000.9002

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✦ Synopsis

Perfect single crystals of a lactone form of rhodamine B (RB lactone, 3, 6-bis(di-ethylamino)-spiro-[isobenzofuran-1(3H), 9-[9H]xanthene]-3-one, C 28 H 30 N 2 O 3 ) were hydrothermally prepared in a sol+gel system of rhodamine B+Na 2 O+SiO 2 +gly-cerol+H 2 O. The product of crystalline RB lactone was identi5ed by 1 H NMR. The structure was determined by single-crystal X-ray di4raction. Lactone crystallizes in a monoclinic system, space group P2 1 /n with a ‫؍‬ 16.559(3) A > , b ‫؍‬ 15.657(3) A > , c ‫؍‬ 19.381(2) A > , ‫؍‬ 100.10(1)3, V ‫؍‬ 4947(1) A > 3 , Z ‫؍‬ 8. The structure was resolved by direct method and re5ned to R ‫؍‬ 0.060 and R w ‫؍‬ 0.064 on the basis of 3834 observed re6ections with I9 2.50 (I). An asymmetric unit consists of two independent lactone molecules. Both molecules contain a central planar section and planar groups bonded to the central carbon, respectively. Pure phase of the lactone crystallites obtained was con5rmed by comparison of the observed XRD pattern with the simulated one.

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