A low-temperature phase of the 1:1 complex of 2-(6-diethylamino-3-diethyl-iminio-3H-xanthen-9-yl)benzoate with ethyl gallate at 93 K.

ABSTRACT: The title compound, C(28)H(30)N(2)O(3)·C(9)H(10)O(5), is a well known red leuco complex of 2-(6-diethylamino-3-diethyl-iminio-3H-xanthen-9-yl)benzoate (rhodamine B base abbreviated to RBB, a leuco dye) with ethyl gallate (EG, developer). The structure of the complex at room temperature has recently been reported by Sekiguchi, Takayama, Gotanda & Sano [Chem. Lett. (2007 ▶), 36, 1010-1011]. We have found a new phase of the material with two discrete base/developer complexes (RBB-A/EG-A and RBB-B/EG-B) in the asymmetric unit at 93 K. There are no significant differences between the two developer mol-ecules EG-A and EG-B. The lactone ring of RBB is opened in each mol-ecule to form a zwitterionic structure. However, the xanthene system is almost flat in RBB-A (r.m.s. deviation 0.0234 Å) but is

SUBMITTER: Mizuguchi J 

PROVIDER: S-EPMC2961781 | biostudies-literature | 2008 Jun

REPOSITORIES: biostudies-literature