In this pioneering research, mononuclear coordination complexes and coordination polymers were obtained using the conformationally flexible ditopic ligand 4,4′-diaminodiphenylethane and different metal salts (nitrates, sulfates, tetrafluoroborates and perchlorates). Seven new products, including the mononuclear complexes [Cd(2,2′-bpy)
3](ClO
4)
2](dadpe)(4,4′-bpy) (
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In this pioneering research, mononuclear coordination complexes and coordination polymers were obtained using the conformationally flexible ditopic ligand 4,4′-diaminodiphenylethane and different metal salts (nitrates, sulfates, tetrafluoroborates and perchlorates). Seven new products, including the mononuclear complexes [Cd(2,2′-bpy)
3](ClO
4)
2](dadpe)(4,4′-bpy) (
1), [Ni(dadpe)
2(H
2O)
4](SO
4)
.H
2O (
2), one-dimensional coordination polymers {[Zn(NO
3)(dadpe)(dmf)
2](NO
3)}
n (
3), {[Cd(2,2′-bpy)
2(dadpe)](ClO
4)
2}
n (
4), and two-dimensional coordination polymers, {[Cd(4,4′-bpy)
2(H
2O)
2](ClO
4)
2(dadpe)(EtOH)
2}
n (
5), {[Co(4,4′-bpy)
2(H
2O)
2](BF
4)
2(dadpe)(EtOH)
2}
n (
6) and {[Cd(adi)(dadpe)](H
2adi)}
n (
7), (dadpe=4,4′-diaminodiphenylethane, 2,2′-bpy=2,2′-bipyridine, 4,4′-bpy=4,4′-bipyridine, H
2adi=adipic acid) were produced. The synthesized compounds were characterized by FTIR and single-crystal X-ray diffraction analyses. The dadpe was recorded as a neutral guest in the crystals of mononuclear complex
1 and in coordination polymers
5 and
6. In compound
2, two dadpe ligands coordinate in a monodentate mode and occupy two trans-positions in the [Ni(H
2O)
4(dadpe)
2]
2+ octahedral complex cation. Coordination polymers
3 and
4 represent single chains originating from dadpe as a bidentate linker in both. The H-donor’s possibilities of amino groups were utilized in the interconnection of coordination chains into H-bonded networks via NH(NH
2)···O hydrogen bonds. The isostructural coordination polymers
5 and
6 comprise similar cationic square grids [M(4,4′-bpy)
2(H
2O)
2]
2+ [M=Cd (
5), M=Co (
6)], with
sql topology balanced by the charge-compensated anions, while dadpe and EtOH as neutral guests are situated in the interlayer space. The neutral 2D coordination network in
7 with the
sql topology originates from both adi and dadpe linkers as bidentate-bridging ligands, and the neutral H
2adi is entrapped as a guest in crystal lattice. The impact of different types of intermolecular interactions was evaluated by Hirshfeld surface analysis.
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