1. Crystal engineering of zinc(II) metal–organic frameworks: role of steric bulk and angular disposition of coordinating sites of the ligands
- Author
-
Koushik Dhara, Raju Mondal, and Manas K. Bhunia
- Subjects
Stereochemistry ,Hydrogen bond ,Ligand ,Coordination number ,Tetrahedral molecular geometry ,General Chemistry ,Condensed Matter Physics ,Crystal engineering ,Isophthalic acid ,chemistry.chemical_compound ,Crystallography ,chemistry ,General Materials Science ,Metal-organic framework ,Trimesic acid - Abstract
Three novel 2D and 3D coordination polymers, [Zn(TPA)(H2MDP)]n (1), [Zn(IPA)(H2MDP)]n (2) and [Zn(HTMA)(H2MDP)]n (3) (H2MDP = methylenebis(3,5-dimethylpyrazole), H2TPA = terephthalic acid, H2IPA = isophthalic acid and H3TMA = trimesic acid), have been synthesized under hydrothermal conditions and structurally characterized by single crystal X-ray diffraction. For all three structures, the zinc atoms show a coordination number of four and adopt tetrahedral geometry, and subsequently form a diamondoid, a (2,4) and a (4,4) network. The employment of sterically hindered H2MDP ligand, on the other hand, successfully prohibits interpenetration among the 2D grids. The complex 1 features a metal–organic framework exhibiting a three-fold interpenetrated diamondoid network with linear dicarboxylate ligand (H2TPA) as an auxiliary ligand. The bent dicarboxylate ligands (H2IPA and H3TMA), on the other hand, lead to 2D non interpenetrative grid networks for 2 and 3. A comparative study of 2 and 3 underpins the importance of the hydrogen bond and π–π interaction in the synthesis of coordination polymers.
- Published
- 2008
- Full Text
- View/download PDF