Alkali metal and zinc complexes of a bridging 2,5-diamino-1,4- benzoquinonediimine ligand

Yuanting Su, Yanxia Zhao, Jing Gao, Qingsong Dong, Biao Wu, Xiao Juan Yang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

Two alkali metal complexes of a bridging 2,5-diamino-1,4- benzoquinonediimine ligand (dipp-dabqdiH 2), [(thf) 2Li(μ-dipp-dabqdi)Li(thf) 2] (1) and [(dme) 1.5Na(μ-dipp-dabqdi)Na(dme) 1.5] n (2, dme = 1,2-dimethoxyethane), have been synthesized by the reaction of dipp-dabqdiH 2 with Li nBu or sodium metal. In addition, treatment of 1,2,4,5-tetrakis(2,6-diisopropylamino)benzene (dipp-tabH 4) with potassium metal in dme afforded the complex [(dme) 2K(μ-dipp- tabH 2)K(dme) 2] (3). X-ray crystal diffraction analyses revealed that complexes 1 and 3 have dinuclear structures, while the sodium complex 2 aggregates to a one-dimensional polymer through bridging dme ligands. With increasing ion radius, the coordination number of the alkali metal (Li, Na, and K) increases from four to five to six, while the coordination geometry changes from distorted tetrahedral to square pyramidal and further to octahedral in 1, 2, and 3, respectively. The salt metathesis reactions of 1 and 2 with anhydrous ZnCl 2 yielded the ion-contacted zinc complexes [(thf) 3Li(μ-Cl)ClZn(μ-dipp-dabqdi)ZnCl(μ-Cl)Li(thf) 3] (4), [(dme) 2Li(μ-Cl)ClZn(μ-dippdabqdi)ZnCl(μ-Cl)Li(dme) 2] (5), and [(dme) 2Na(μ-Cl) 2Zn(μ-dipp- dabqdi)Zn(μ-Cl) 2Na(dme) 2] (6), respectively. The ligand exists as the dianionic form in compounds 1-6 upon double deprotonation, and a complete electronic delocalization (except for 3) of the quinonoid π-system is observed between the metal centers over the two N=C - =C - N halves of the ligand. The electronic structures of the complexes were studied by density functional theory (DFT) computations.

Original languageEnglish
Pages (from-to)5889-5896
Number of pages8
JournalInorganic Chemistry
Volume51
Issue number10
DOIs
Publication statusPublished - 21 May 2012
Externally publishedYes

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