Crystal structure and electrical conductivity of {trans-[Ru(ox)(en)2NO]}2(TCNQ)3 (oxZoxalate, enZethylenediamine, TCNQZ7,7,8,8-tetracyanoquinodimethane) at ground state

The radical anion salt of TCNQ (7,7,8,8-tetracyanoquinodimethane) with the trans-[Ru(ox)(en)2NO]C cation (oxZoxalate, enZ ethylenediamine), namely {trans-[Ru(ox)(en)2NO]}2(TCNQ)3, was synthesized by slow diffusion method from water solution of trans- [Ru(ox)(en)2NO]Cl and of LiTCNQ. An X-ray structure analysis indicates that the cation: anion ratio of the obtained complex is 2:3. Two of three TCNQ molecules are stacked along the a direction to form columnar structure. Between these columns the remaining TCNQ molecules are inserted with their long molecular axis along a direction. Several –N/HN– type hydrogen bonds between nitrile groups of TCNQ molecules and ethylenediamine ligands of trans-[Ru(ox)(en)2NO]C cation, and –O/HN– type hydrogen bonds between oxygen atoms of oxalate ligands of trans-[Ru(ox)(en)2NO]C cations and ethylenediamine ligands of neighboring trans-[Ru(ox)(en)2NO]C cations are observed. The room temperature electrical conductivity of {trans-[Ru(ox)(en)2NO]}2(TCNQ)3 is !10K6 S cmK1. q 2005 Elsevier B.V. All rights reserved.