Synthesis, crystal structures and properties of novel heterobimetallic Cd–Pt and Zn–Pt coordination polymers using nicotinic acid

• Published in: Inorganic chemistry communications 2012-11, Vol.25, p.14-17
• Main Authors: Miyazaki, Yuhei, Kataoka, Yusuke, Mori, Wasuke, Kawamoto, Tatsuya
• Format: Article
• Language: English
• Subjects: Crystal structure; Gas adsorption property; Pt complex ligand; Zn and Cd coordination polymers
• ISSN: 1387-7003; 1879-0259
• DOI: 10.1016/j.inoche.2012.08.013

Two novel heterobimetallic coordination polymers, [Cd{Pt(nic)4}]n・5nH2O (Cd–Pt-1) and [Zn{Pt(nic)4}(H2O)4]n・nH2O (Zn–Pt-1) (nicH = nicotinic acid), were synthesized by a one-pot slow-evaporation reaction system in water. Single crystal X-ray analysis revealed that Cd–Pt-1 and Zn–Pt-1 are two-dimensional sheet frameworks with open pores and one-dimensional chain polymers, respectively. However, crystal structure of Cd–Pt-1 is not robust in air. Therefore, BET surface area (pore volume) of Cd–Pt-1 calculated by N2 gas adsorption measurement is very low and the value is 22.5m2g−1 (0.00813cm3g−1). Two novel heterobimetallic coordination polymers, [Cd{Pt(nic)4}]n・5nH2O (Cd–Pt-1) and [Zn{Pt(nic)4}(H2O)4]n・nH2O (Zn–Pt-1) (nicH = nicotinic acid), were synthesized by a one-pot slow-evaporation reaction system in water. Single crystal X-ray analysis revealed that Cd–Pt-1 and Zn–Pt-1 are two-dimensional sheet frameworks and one-dimensional chain polymers, respectively. Although crystal structure of Cd–Pt-1 has open pores for N2 or H2 gas adsorption, they are closed due to the loss of crystal structure by removal of guest molecules. [Display omitted] ► Two types of Cd–Pt and Zn–Pt coordination polymers with nicotinic acid ligand were synthesized and identified. ► Crystal structure of Cd–Pt coordination polymer is two dimensional sheet framework. ► Crystal structure of Zn–Pt coordination polymer is one-dimensional zig–zag chain structure. ► N2 and H2 gas adsorption properties of two Pt coordination polymers were investigated.