Synthesis and applications of (5-substituted benzimidazolo)-benzo-15-crown-5 and 4,4′-bis-benzimidazolo-dibenzo-15-crown-5 for the colorimetric detection of Au³⁺

AbSTRACT

In the present work, we have reported the synthesis of benzimidazoles functionalized crown ether derivatives of 4-formyl benzo-15-crown-5/4,4′-diformyl dibenzo-15-crown-5 and substituted diamine pyridine using sulfamic acid as a catalyst in DMSO. These molecules are used for the colorimetric determination of Au³⁺ selectively among other metal cations such as Fe²⁺, Co²⁺, Ni²⁺, Cu²⁺, Zn²⁺, Cd²⁺, Pb²⁺, Hg²⁺, Au³⁺ and Ag⁺ ions_.

Graphical Abstract

KEYWORDS:

• Formyl benzo crown ether
• benzimidazole
• chemo sensor
• Au³⁺ cation
• aqueous solutions

Additional information

Funding

Prof. Dr. M. B. Deshmukh (UGC-BSR Faculty fellowship) F.No.18-1/2011 (BSR) and Chemistry Department of Shivaji University, Kolhapur, for providing the spectral analysis.