Rezvan MOKHTARI a3 a Nanochemistry Research Laboratory, Department of Chemistry, University of Birjand, Birjand 414, Iran; e-mail: 1 reihaneh.malakooti@gmail.com, 2 sohyla_shafiei@yahoo.com, 3 rzmkh@yahoo.com b Department of Chemistry, College of Sciences, Birjand University, Birjand 414, Iran; e-mail: 1 ssobhani@birjand.ac.ir, 2 nasrin_razavi2009@yahoo.com ... Received June 28, 2011 Accepted September 2, ...