In homogeneous catalysis, the catalyst is in the same phase as the reactant. The number of collisions between reactants and catalyst is at a maximum. Synthetic Route of 499-40-1, Synthetic Route of 499-40-1, C12H22O11. A document type is Article, introducing its new discovery.
The synthetic details, characterization data and single crystal X-ray structural analyses of [Zn(dpa)(N3)2] (1) and [Zn(dpa)(N3)(NO3)]2 (2) (dpa=2,2?- dipyridylamine) are described. Structural study reveals that the zinc(II) centre in 1 is in a pseudotetrahedral ZnN4 environment ligated by two terminal azide N atoms and two pyridine N atoms of the chelator. The coordination polyhedron around each metal ion in dinuclear 2 is best described as a ZnN4O2 distorted octahedron linked by two end-on azido bridges. The mononuclear units in 1 are engaged in bifurcated intermolecular hydrogen bonding (N-H…N) between amine N of dpa and coordinated N of azide along with aromatic pi-pi stacking leading to a 2D sheet. In 2, the dinuclear units participate in intermolecular N-H…O hydrogen bonding between amine N of dpa and bound O of bidentate nitrate in combination with pi-pi interactions resulting to a 3D supramolecular continuum. 1 and 2 display high energy intraligand 1(pi-pi*) fluorescence and intraligand 3(pi-pi*) phosphorescence in glassy solutions (DMF at 77 K). A band (372 nm) observed for both 1 and 2 in their solid-state emission spectra is an excimeric emission arising due to aromatic pi-pi interaction. The role of dpa, a tailored diimine (-N=C-NH-C=N-) in 1 and 2 is discussed towards functionalisation on crystal engineering and luminescence behaviour.
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Reference:
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics