Ponnaiyan Ayyappan

Abstract: The three-dimensional Cu(II) coordination polymers [Cu(isonicotinate)2][EtOH] (1) and Cu(nicotinate)2 (2) were synthesized by treating copper nitrate with isonicotinic acid and nicotinic acid under hydro(solvo)thermal conditions, respectively. X-ray single-crystal structure determinations reveal that the Cu(II) centers in 1 adopt a slightly distorted square pyramidal geometry, while the Cu(II) centers in 2 exhibit a coordination geometry intermediate between square pyramid and trigonal bipyramid. The Cu(II) centers in 1 and 2 coordinate to both the pyridyl and carboxylate functionalities of the isonicotinate and nicotinate bridging ligands, respectively, to result in complicated 3-D framework structures. Compound 1 exhibits rhombic open channels that are occupied by removable ethanol molecules. Magnetic measurements indicated that 1 is a simple paramagnet with only very weak antiferromagnetic interactions, while 2 exhibits more pronounced antiferromagnetic interactions with J/k = −6.4 K. Crystal data for ...

TL;DR: A family of polymeric coordination networks based on meta-pyridylphosphonate bridging ligands has been synthesized and characterized by single-crystal X-ray crystallography and exhibit powder second harmonic generation signals larger than that of potassium dihydrogen phosphate.

TL;DR: Compounds 3 and 4 are isostructural and exhibit network topologies similar to that of 1 with open channels occupied by disordered trans-3-(3-pyridyl)acrylic acid and water guest molecules.

TL;DR: A hydro(solvo)thermal reaction between zinc perchlorate and ethyl ester of a new pyridinecarboxylate bridging ligand of approximately 17.6 A in length yields a unique coordination polymer which contains both interdigitated infinite 1D chains and interpenetrated 2D rhombohedral grids.

TL;DR: The present work demonstrates that interesting open frameworks can be readily synthesized on the basis of metal pyridylphosphonates.