[1] Panjab Univ, Dept Chem, Chandigarh 160014, India
[2] Panjab Univ, Ctr Adv Studies Chem, Chandigarh 160014, India
[3] Himachal Pradesh Univ, Dept Chem, Shimla 171005, India
[4] Tech Univ Bergakad Freiberg, Inst Anorgan Chem, D-09596 Freiberg, Germany