Manganese is one of the essential trace elements in human body

but excessive intake of manganese may cause poisoning and even death.Therefore

it is of great significance to develop a new method for detection of manganese ions

which is low cost

high sensitive and easy to operate.A kind of bipolar tetradentate host ligand bis salophen was synthesizd with salicylaldehyde and 3

3′-diaminobenzidine and self assembled with 3

3′ diaminobenzidine as a guest ligand to form a bis-salophen supramolecular polymer which was used in the detection of Mn2+ by resonance light scattering(RLS) technique.The morphologies of manganese ions under different acidity were simulated by using a software Visual Minteq.Experimental results showed that under the optimized conditions of Tris-HCl buffer solution

acidity of pH 7.5

reaction temperature of 20 ℃ and reaction time of 15 min

there was a good linear relationship between RLS intensity and concentration of manganese ions in solution

with a correlation coefficient(r) of 0.999 4

a linear range of 0.4-60 nmol/mL

a linear regression equation of IRLS=270.64 c(nmol/mL)+1 530.21.The limit of detection was 0.13 nmol/mL.The bis-salophen supramolecular polymer was successfully applied in the detection of manganese ions in Xiangjiang River water and domestic water.