Microwave assisted synthesis and molecular structure visualization of ultrahigh surface area Ni-6,6′-dibromo-indigo coordinated polymeric MOFs stabilized via hydrogen bonding

Ni-6,6'-dibromo-indigo coordinated polymeric MOFs were carefully synthesized via a microwave assisted hydrothermal technique. Ni-MOFs were characterized via X-ray diffraction (XRD), 3D-atomic force microscope (3D-AFM) as well as scanning electron microscope (SEM). Molecular structure visualization studies have been indicated by presence of a different six types of H-bonding (two are intra-H-bonding and the other four possibilities are inter-H-bond) reinforce and stabilize the skeleton of 3D-Ni-MOFs. The (BET) specific surface area of Ni-6,6'-dibromo-indigo MOFs were found similar to 5131 m(2) g(-1) with a large different pore sizes, that ranged in between 4.2 and 10.1 angstrom. The molecular structure visualization studies of Ni-MOFs confirmed the presence of a tunneling open pores with overall diameter of 11.6 angstrom that, divided into two equal tunneling pores each of 4.84 angstrom, which is completely fitted and matches with obtained experimental data. Furthermore 3D-AFM confirmed that, Ni-MOF surfaces have different heights gradient that responsible for extraordinary surface area by some extent.