Temperature-Related Synthesis of Two Anionic Metal–Organic Frameworks with Distinct Performance in Organic Dye Adsorption

In this paper, two 3D anionic metal–organic frameworks, [(CH 3 CH 2 ) 2 NH 2 ]·[Zn(BTC) 1/3 (PyC)]·1/2CH 3 CN·2H 2 O (NKU- 102 ) and [(CH 3 CH 2 ) 2 NH 2 ]·[Zn 2 (BTC) (PyC)]·1.5H 2 O·DEF (NKU- 103 ), were constructed from the same reaction system at different temperature. Though both are of anionic framework, NKU- 102 possesses a sealed 3D framework based on octahedral cage and shows negligible adsorption capacity of organic dyes, whereas NKU- 103 features an open triangular microchannel surrounded by two types of helical chains, and thus exhibits outstanding size-selective adsorption toward small cationic organic dyes.