Synthesis and Characterization of complexes of ... - Ultrascientist.org

404 Prem. Mohan Mishrashow three bands which may be assignedto 6 A 1g 6 T 1g (14710 cm -1 ), 6 A 1g 6 T 2g(19040 cm -1 ) and 6 A 1g (F) 6 Eg 25000cm -1 transition assuring ideal octahedralsystem 20 .The magnetic moment (5.9 BM) alsosupports outer orbital octahedral geometry 21for this complex.(iii) Generally Cobalt (III) complexes areoctahedral the two absorption bands foundin the complex are assigned to 1 A 1g 1 T 1g and 1 A 1g 1 T 2g electronic absorptiondata suggests octahedral geometry forthese complexes.Magnetic moment measurements alsosuggests octahedral geometry for itscomplex.(iv) The Mn(II) complex exhibit three bandsat 11850, 16460 and 23810 cm -1 indicatinghexa co-coordinated structure. 14-18The magnetic moment value of thiscomplex (1.08 BM) looks subnormal. It maybe due to metal – metal interaction 21 . Thissuggests that complex may be binuclear.Table 1. Elemental analysis data of ligand and metal complexCompounds ColourElemental analysis% observed (calculated)M C H N S ClHNTS Colourless 57.37 5.28 16.72 12.64(58.75) (4.49) (17.13) (13.10)[Cr(HNTS) 2 ]Cl Yellowish 8.73 49.06 4.82 13.94 10.35 5.72(8.72) (49.07) (3.47) (14.59) (11.15) (6.17)[Mn(HNTS) 2 Yellow 12.42 54.04 3.78 15.32 11.34(10.12) (53.03) (3.68) (15.46) (11.78)[Fe(HNTS) 2 Cl Green 8.73 48.90 3.46 14.48 10.30 5.92(9.63) (49.70) (3.45) (14.49) (11.09) (6.12)[Co(HNTS) 2Cl Green 9.30 48.74 4.78 13.26 10.18 5.92(10.11) (49.43) (3.43) (14.42) (11.02) (6.09)Table 2. Decomposition temperature, Electrical conductivityand magnetic moment value of complexesDecomposition Electrical Magnetic momentComplex Temperature (K) conductivity ( ef )(S cm 2 mol -1 ) (Bohr magneton)[Cr(HNTS) 2 ]Cl 477 89.3 3.82[Mn(HNTS) 2 570 20.70 1.10[Fe(HNTS) 2 Cl 478 90.2 5.96[Co(HNTS) 2 Cl 512 98.76 0.0