“…The complexes Cu(chelate) 2 X 2 or Cu(chelate) 2 XY (chelate ¼ 2,2 0 -bipyridyl (bpy) or 1,10-phenanthroline (phen); X, Y ¼ various anions, coordinated or not) exemplify this [1,2] and much structural data are available [3][4][5][6][7][8]; structural data are more limited for corresponding complexes containing the more flexible ligand di-2-pyridylamine (dpyam) [5,[9][10][11][12][13][14][15][16][17]. The coordination geometry in the five-coordinate complexes [Cu(chelate) 2 X]Y (chelate ¼ bpy or phen) tends to be nearly regular trigonal bipyramidal with slight distortion towards square pyramidal ( > 0.5), e.g., [Cu(bpy) 2 (NCS)](NO 3 ) ( ¼ 0.89) [18], [Cu(bpy) 2 (NCS)](NCS) ( ¼ 0.65) [19], [Cu(bpy) 2 (NCS)](BF 4 ) ( ¼ 0.61) [20], [Cu(bpy) 2 (NH 3 )](BF 4 ) 2 ( ¼ 0.77) [21] and [Cu(phen) 2 (NCS)](ClO 4 ) ( ¼ 0.81) [7]. With chelate ¼ dpyam, complexes tend towards square-based pyramidal geometry with slight distortion towards trigonal bipyramidal ( < 0.5), e.g., [Cu(dpyam) 2 (NCS)] þ ( ¼ 0.…”