A self-assembled porous Zn(II) metal–organic framework based on fluorinated bis-pyridinecarboxamide derivative ligand: Synthesis, structure and properties

A new single pot synthesis of μ-bis(oxido)bis{oxidovanadium(V)} dipicolinato complex with 2-aminopyridinium as counter cation: Spectroscopic, structural, catalytic and theoretical studies

“…The use of pyridine carboxamide as a ligand serves as an important construction unit for the coordination chemists [7]. This ligand can be easily prepared by the condensation reaction between pyridyl bearing amines and carboxylic acid precursors promoted by coupling agents [8].…”

Conformational isomerism of a flexible fluorinated bis-pyridinecarboxamide ligand in the structural direction of two distinct layered CuII coordination polymers

“…It is interesting that the chloride anions are not involved in the final crystalline product, and one ligand component is bis-deprotonated to provide additional negative charges for necessary charge balance. For the tfpbbp ligand, the C16-N4 bond distance (1.391(4) Å) is significantly longer than that of C6-N2 (1.343(6) Å) for H 2 tfpbbp in the same structure and the C-N length (1.337(3) Å) for H 2 tfpbbp in its Zn II complex [10]. It is also observed that the N-H group of the neutral H 2 tfpbbp ligand is engaged in N2-H2AÁ Á ÁO3 i hydrogen bonding (HÁ Á ÁO/NÁ Á ÁO distance: 2.37/3.219(5) Å, angles: 167°; i = x À 1, y, z) with the included DMF molecule (see Table S2 for details of H-bonding).…”

“…Recently, we have developed an interesting building block, N,N 0 -[(2,3,5,6-tetrafluoro-1,4-phenylene)bis(methylene)]bis(pyridine-4-carboxamide) (H 2 tfpbbp), which has a flexible disposition of the pyridyl, carboxamide, and methylene groups around a tetrafluorinated benzene skeleton that will promote the formation of secondary interactions. As far as we know, with the exception of a microporous Zn II complex of H 2 tfpbbp [10], coordination polymer with such flexible bis-pyridyl carboxamide ligands based on a fluorinated backbone has not been reported so far. As one of our systematic works, we present herein two novel Cu II coordination polymers {[Cu(H 2 -tfpbbp)(tfpbbp)(H 2 O)] Á 2DMFÁ4H 2 O} n (1) and {[Cu(H 2 tfpbbp) 2 (ClO 4 ) 2 ] Á 3H 2 O} n (2) that display an extended distinctness of 2-D (4,4) networks derived from the conformational discrepancy of the ligands (anti in 1 and gauche in 2, see Scheme 1).…”