Polymers and Hybrid Networks of Different Dimensionalities

Coordination Polymers and Hybrid Networks of Different Dimensionalities Formed by Metal Sulfites 

Chemistry and Physics of Materials Unit and CSIR Centre of Excellence in Chemistry, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore 560064, India 

Coordination polymers, open-framework materials, and hybrid compounds built up with various anions have been described in the literature. The most common anions employed in open-framework structures are silicates and phosphates.1-3 Metal carboxylates with a variety of structures and dimensionalities have also been described in the recent literature.4 5 In recent years, other oxyanions such as sulfate, selenate, selenite, and tellurite have also been employed to design these structures.6,7 Surprisingly, coordination polymers 

Synthesis. Ammonium sulfite monohydrate, 4,4 -bipyridyl, 1,4-diazabicyclo[2.2.2]octane (DABCO), neodymium(III) nitrate hexahy-drate (Aldrich), 1,10-phenanthroline, ethylenediamine (SD Fine, India), and zinc acetate dihydrate (Qualigens, India) of high purity were used for the synthesis. 

Characterization. CHNS analysis was carried using the Thermo Finnigan FLASH EA 1112 CHNS analyzer. Energy dispersive analysis of X-rays (EDAX) was carried using the OXFORD ED AX system. Infrared spectroscopic studies of KBr pellets were recorded in the mid-IRregion (Bruker IFS-66v). Thermogravimetric analysis was carried out (Metler-Toledo) in nitrogen atmosphere (flow rate 

---

In conclusion, zinc sulfite-based coordination polymers and hybrid networks of different dimensionalities have been synthesized and characterized. An open-framework hybrid sulfite—sulfate, where both SO32- and S042- are part of a two-dimensional layer, has also been synthesized and characterized. On the basis of the present studies, it appears that many more metal sulfite-based open-framework and hybrid materials can be synthesized. 

In conclusion, zinc sulfite-based coordination polymers and hybrid networks of different dimensionalities have been synthesized and characterized. An open-framework hybrid sulfite—sulfate, where both and S04 " are part of a... 

---