Superlative Scaffold of 1,2,4-Triazole Derivative of Glycine Steering Linear Chain to a Chiral Helicate

Solvothermal and classical synthesis with an identical recipe involving 4H-1,2,4-triazol-4-yl acetic acid ( HL1 ) and CdCl 2 afforded two-dimensional (2D) ( 1 ) and one-dimensional ( 2 ) coordination polymers, respectively. Hexagonal plate-like crystals of [Cd 2 (L1) 2 Cl 2 ] ( 1 ), which crystallize in the chiral orthorhombic space group ( P 2 1 2 1 2 1 ), were obtained in high yield. The 1,2,4-triazole-4-yl acetate ( L1 ) ligand, which has a significant kink in the spacer, leads to the formation of a Cd II complex displaying a 2D single-stranded helical array. The pitch height of the helix is equal to the length of the crystallographic a axis (7.579 Å) which comprises two cadmium atoms and two ligands. Solid-state emission of 1 shows a strong emission band around 465 nm with photoexcitation at 290 nm. Mercury porosimetry measurements reveal pore size distribution with a diameter of 80, 10, and 1 μm. BET shows no preference for N 2(g) but a low H 2(g) adsorption of 4 cm 3 /g. Complex 1, which is constituted by a “soft” nonaromatic network that begins to collapse around 170 °C, was subjected to controlled pyrolysis to produce CdO with morphology and phase selectivity. Texture of the thus obtained pure cubic phase of CdO (β-form) was further tuned with the regulation of the annealing temperature. Crystals of rectangular blocks of [Cd(HL1L1)Cl]·2H 2 O ( 2 ), which were formed in small quantity, feature a centrosymmetric, monoclinic space group ( P 2 1 / c ). Their crystal structure reveals a one-dimensional linear chain where Cd atoms are connected by a triple bridge made up of one μ-chloride and two μ- N 1, N 2-1,2,4-triazole HL1 and L1 . The coordination polymer charge is balanced by both chloride and the carboxylate group of L1 .