hrvatski

Strukturna karakterizacija makrocikličke Schiffove baze s inkludiranim amonijakom, sumporovim dioksidom i klorom

Porous macrocycles are very interesting among the researchers in last years, mainly because of their potential applications in environmental sustainability. These materials can be classified as organic zeolites. Most of the investigations in this particular research area are based on the shape-persistent macrocycles that have a noncollapsible backbone and a well-defined inner void in the size range from less than 1 up to several nanometers [1]. Because of their rigid structure, organic zeolites have potential application as host materials. Furthermore, the size of voids can be rationally designed by utilization of supramolecular forces or by simple increase or decrease of a number of atoms in the macrocyclic ring [2]. The promising field of research in this area are macrocyclic Schiff bases that can be relatively easily synthesized by simple condensation reactions of suitable formyl and amino precursors. Among these materials, there is a great interest in macrocycles that can form porous structures and subsequently bind gaseous species [3]. This paper addresses synthetic procedures for obtaining a macrocyclic Schiff base, essentially built from dialdehyde and diamine precursors with included gases such as ammonia, sulfur dioxide, and chlorine. In this, presentation we report synthesis and crystallization of a large macrocyclic Schiff base, derived from p-phenylendiamine and 2-[5-(2- formylphenoxy)pentoxy]benzaldehyde. The compound was treated with ammonia, chlorine and sulfur dioxide vapors inside a sealed chamber for 3 hours to form a host-guest complex with those gases. The crystal and molecular structure of gas included compounds was determined by single-crystal X-ray analysis. The amount of absorbed gases was determined by TGA. In addition, the guest-free compound and gas loaded compound were characterized by FTIR to verify the stability of the organic framework.

Schiffove baze, makrocikli, inkludirani plinovi

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