Luminescence Property and Structure of a 3D Six- and Eight-Coordinative Cd(II) MOF Containing a [Na₂(H₂O)₆] Unit

Abstract

The preparation, structural characterization, and luminescence investigation of a new six- and eight-coordinative Cd(II) metal–organic framework of formula {[Cd₃(bta)₂][Na₂(H₂O)₆]}_n (1) (H₄bta=1,2,4,5-benzenetetracarboxylic acid) is reported. The 3D structure of 1 consists of bta-bridged trinuclear Cd(II) where six oxygen atoms of four (η¹, η¹ ,-μ₂) and one (η², η² ,-μ₄) carboxylic groups and eight oxygen atoms from four (η², η² ,-μ₄) carboxylic groups complete the six coordination and eight coordination environments around Cd1 and Cd2, respectively, in which is entrapped with [Na₂(H₂O)₆] unit. Furthermore, the luminescence is also discussed.

Keywords:

• carboxylate
• Cd coordination polymer
• luminescence

Acknowledgments

J. Wu and F. M. Wang made equal contributions to the work. This work was partially supported by the grants from the National Natural Science Foundation of China (21201044), Guangdong Medical College (B2010009), Foundation for Distinguished Young Talents in Higher Education of Guangdong, China (LYM11069), Technologies R & D program of Zhanjiang (2011C3108013 and 2012C3106016), Science & Technology Innovation Fund of Guangdong Medical College (STIF201112), Science Foundation of Guangxi University for Nationalities (2011DQ022), and Scientific Research Plan Projects of Shaanxi Education Department (12JK608). Greater contributions from Prof. Zeller are also acknowledged.