Self-Assembly and Host−Guest Interaction of Metallomacrocycles Using Fluorescent Dipyrazole Linker with Dimetallic Clips
摘要:
By employing diimine ligands coordinated dimetallic clips ([(bpy)(2)Pd-2(NO3)(2)](NO3)(2) or [(phen)(2)Pd-2(NO3)(2)KNO3)(2), where bpy = 2,2'-bipyridine, phen = 1,10-phenanthroline) as the corner and anthracene-, naphthalene-, and benzene-based dipyrazolate dianions as the linker, a series of positively charged metallomacrocycles ([M4L2](4+) or [M8L4](8+)) have been synthesized through a directed self-assembly method in aqueous solution. Every macrocycle has a cavity to bind solvent molecules or anions. The structures were characterized by elemental analysis, H-1 and C-13 NMR, electrospray ionization mass spectrometry, and single crystal X-ray diffraction analysis for compound 1.4PF6(-) (1 = {[(bpy)Pd](4)L-2(1)}(4+)), 3 center dot 4PF(6)(-)center dot 8CH(3)CN center dot H2O (3 = {[(bpy)Pd](4)L-2(2)}(4+)), and 7.4PF(6)(-)center dot 6H(2)O (7 = {[(bpy)Pd](4)L-2(5)](4+)). The 1:1 host guest complexation for anthracene-based dipyrazolate-bridged macrocycles with aromatic guests was investigated via UV-vis and fluorescent titration.
Supramolecular Organic Frameworks (SOFs) Using Anthracene Based Flexible Azoles: Synthesis, Structural and Photophysical Studies
作者:Udai P. Singh、Neetu Singh、Aurobinda Mohanty、Ray J. Butcher
DOI:10.1007/s10870-020-00831-8
日期:2021.3
A series of salts viz., BIA.2SIA.2CH3OH (1a), BTA.NDS.2H2O (1b), BTA.NDS.2H2O.2DMF (1c), BBIA.0.5NDS.DMF (1d), BBIA.2SIA.2H2O (1e) and BPA.NDS.2H2O (1f) have been synthesised by solvothermal method. All these salts were characterized by elemental analysis, TGA, PXRD and single-crystal X-ray diffraction technique. Structural analysis revealed that these salts showed N–H⋯O, O–H⋯O, C–H⋯O, C–H⋯π and π⋯π interactions. The overall percentage of short contacts and the contribution of the different intermolecular interactions were examined by Hirshfeld surface analysis. The solid-state emission maxima of all salts is blue-shifted in comparison to the pure ligand. This may due to different modes of packing of anthracene moieties and solvent assisted hydrogen bonding in sulfonate salts. Thermal stability of 1d, 1e and 1f salts are more than other salts. Hirshfeld surface analysis employed to identify intermolecular interactions within the structure. The close inspection of Hirshfeld surface analysis of NDS and SIA molecule in all the structures revealed that the maximum area of the Hirshfeld surface are covered by O⋯H/H⋯O hydrogen bond interaction in all salts
By employing diimine ligands coordinated dimetallic clips ([(bpy)(2)Pd-2(NO3)(2)](NO3)(2) or [(phen)(2)Pd-2(NO3)(2)KNO3)(2), where bpy = 2,2'-bipyridine, phen = 1,10-phenanthroline) as the corner and anthracene-, naphthalene-, and benzene-based dipyrazolate dianions as the linker, a series of positively charged metallomacrocycles ([M4L2](4+) or [M8L4](8+)) have been synthesized through a directed self-assembly method in aqueous solution. Every macrocycle has a cavity to bind solvent molecules or anions. The structures were characterized by elemental analysis, H-1 and C-13 NMR, electrospray ionization mass spectrometry, and single crystal X-ray diffraction analysis for compound 1.4PF6(-) (1 = [(bpy)Pd](4)L-2(1)}(4+)), 3 center dot 4PF(6)(-)center dot 8CH(3)CN center dot H2O (3 = [(bpy)Pd](4)L-2(2)}(4+)), and 7.4PF(6)(-)center dot 6H(2)O (7 = [(bpy)Pd](4)L-2(5)](4+)). The 1:1 host guest complexation for anthracene-based dipyrazolate-bridged macrocycles with aromatic guests was investigated via UV-vis and fluorescent titration.