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Complexes [Cu(phenpyzda)Cl 2(H 2O)]·H 2O ( 1) and [Cu(phenpyzda)Br 2(H 2O)]·2H 2O ( 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 1having 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 1 H,3 H-imidazol[2,3-f][1,10]phenanthroline (= imiphen) in the complex [CuCl 3(imiphenH)]·2H 2O, 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](NO 3) 2·H 2O ( 4), where bpy4diol = 2,2′-bipyridine-4,4′-diol, shows a two-dimensional (2D) hydrogen bonded network with hexagonal topology. [Cu(bpy4da)(NO 3) 2] ( 5) where bpy4da = 2,2′-bipyridine-4,4′-diamine has a 3D 2-fold interpenetrating α-Po related hydrogen bonded structure. Complexes [Cu(bpy4da)Cl 2] ( 6) and [Cu(bpy5dmol)Cl 2] ( 7) where bpy5dmol = 2,2′-bipyridine-5,5′-bis(hydroxymethyl) have similar chloro bridged coordination chains that hydrogen bond together into 3D and 2D networks, respectively. Despite their different hydrogen bonding patterns, complexes 6and 7are isomorphic. [ABSTRACT FROM AUTHOR]

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. [ABSTRACT FROM AUTHOR]

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(CH3OH), where H2btca = 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)Br2] has square-pyramidal geometry and forms 1-D zigzagging coordination chains that pack into a 2-D herringbone motif. In complex [Ni(dicnq)3]Br2·3H2O, the octahedral complex cations show unusual CN···π interactions and form a porous 3-D structure. Both complexes [Co(dicnq)2Br2] and [Cu(dicnq)2Br2][Cu(dicnq)2Br]Br·(CH3CN)·2(H2O) 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](CF3R.3) forms zigzagging chains through π−π stacking interactions. [ABSTRACT FROM AUTHOR]