Search

Complexes [Cu(phenpyzda)Cl2(H2O)]·H2O (1) and [Cu(phenpyzda)Br2(H2O)]·2H2O (2), where phenpyzda = pyrazino[2,3-f][1,10]phenanthroline-2,3-diamide, show similar molecular structures with square planar Cu(II). Each complex has a complicated three-dimensional (3D) hydrogen bonding network with 1 having an unusual 3,9-connectivity. Use of the corresponding carboxylic acid, pyrazino[2,3-f][1,10]phenanthroline-2,3-dicarboxylic acid, results in the unexpected conversion of the ligand to 1H,3H-imidazol[2,3-f][1,10]phenanthroline (= imiphen) in the complex [CuCl3(imiphenH)]·2H2O, which has a 3D hydrogen bonded network structure of 3,6-connectivity. The more extended phenanthroline-based ligand 1,10-phenanthroline-5,6-[pteridine-2,4-diamine] was also synthesized, but no crystalline complexes of it were isolated. [Cu(bpy4diol)2](NO3)2·H2O (4), where bpy4diol = 2,2′-bipyridine-4,4′-diol, shows a two-dimensional (2D) hydrogen bonded network with hexagonal topology. [Cu(bpy4da)(NO3)2] (5) where bpy4da = 2,2′-bipyridine...

The complex [Co(bpydiol-H)3]·H2O, where bpydiol is 2,2′-bipyridine-3,3′-diol, features a simple octahedral tris-chelate complex that forms a honeycomb-like six-connected 3-D network of 4966 topology through weak C–H⋯O hydrogen bonding. The network shows significant channels and the material is remarkably robust. The water guest molecules can be solvent exchanged for 1,2-dibromobenzene molecules. Cu(II) complexes of bpydiol are also reported: [Cu(bpydiol-H)X], where X = Cl−, Br−, or NO3−, which all have coordination chain structures. The coordination chains in [Cu(bpydiol-H)(NO3)] assemble through weak CH..ONO2 hydrogen bonds to form a corrugated 2-D network.

The extended structures of transition metal complexes of the phenanthroline-based ligand 6,7-dicyanodipyridoquinoxaline (dicnq) are reported, including the mixed ligand complex [{Cu(dicnq)Br}2H2btca] 1.7(CH 3 OH), where H 2 btca = doubly deprotonated 1,2,4,5-benzenetetracarboxylic acid, which shows 1-D coordination chains that organize into a 2-D net through hydrogen bonding. [Cu(dicnq)Br 2 ] has square-pyramidal geometry and forms 1-D zigzagging coordination chains that pack into a 2-D herringbone motif. In complex [Ni(dicnq)3]Br2·3H 2 O, the octahedral complex cations show unusual CN···π interactions and form a porous 3-D structure. Both complexes [Co(dicnq) 2 Br 2 ] and [Cu(dicnq) 2 Br 2 ][Cu(dicnq) 2 Br]Br·(CH 3 CN)-2(H 2 0) show roughly octahedral complexes that show weak C-H···N hydrogen bonding along with π-π stacking interactions to form 3-D network structures such as a 3-fold interpenetrating diamondoid structure. Complex [Ag(dicnq) 2 ](CF 3 SO 3 ) forms zigzagging chains through π-π stacking interactions.