Three-, Two-, and One-Dimensional Metal Phosphonates Based on [Hydroxy(4-pyridyl)methyl]phosphonate:  M{(4-C₅H₄N)CH(OH)PO₃}(H₂O) (M = Ni, Cd) and Gd{(4-C₅H₄N)CH(OH)P(OH)O₂}₃·6H₂O

Abstract

Based on the [hydroxy(4-pyridyl)methyl]phosphonate ligand, three compounds with formula Ni{(4-C(5)H(4)N)CH(OH)PO(3)}(H(2)O) (1), Cd{(4-C(5)H(4)N)CH(OH)PO(3)}(H(2)O) (2), and Gd{(4-C(5)H(4)N)CH(OH)P(OH)O(2)}(3).6H(2)O (3) have been synthesized under hydrothermal conditions. The crystal data for 1 are as follows: orthorhombic, space group Pbca, a = 8.7980(13) A, b = 10.1982(15) A, and c = 17.945(3) A. For 2 the crystal data are as follows: monoclinic, space group C2/c, a = 23.344(6) Angstroms, b = 5.2745(14) Angstroms, c = 16.571(4) Angstroms, and beta = 121.576(4) degrees. The crystal data for 3 are as follows: rhombohedral, space group R, a = 22.2714(16) Angstroms, b = 22.2714(16) Angstroms, and c = 9.8838(11) Angstroms. Compound 1 adopts a three-dimensional pillared layered structure in which the inorganic layers made up of corner-sharing {NiO(5)N} octahedra and {CPO(3)} tetrahedra are connected by pyridyl groups. A two-dimensional layer structure is found in compound 2, which contains alternating inorganic double chains and pyridyl rings. Compound 3 has a one-dimensional chain structure where the Gd atoms are triply bridged by O-P-O linkages. The pyridyl nitrogen atom in 3 remains uncoordinated and is involved in the interchain hydrogen bonds. Magnetic susceptibility studies of 1 and 3 reveal that weak ferromagnetic interactions are mediated between Ni(II) centers in compound 1. For compound 3, the behavior is principally paramagnetic.

Phosphonate and sulfonate metal organic frameworks

“…Alternatively framework compounds have been made using pyridyl ligands carrying phosphonate functionalities on their ring. 59,62,63 A series of lanthanide-transition metal compounds were made using the unsymmetrical 2-pyridylphosphonate ligands. 64 Despite varying the lanthanide metal through almost the entire lanthanide series the compounds formed only two different 3-D frameworks.…”

Structures and luminescent properties of lanthanide phosphonates

“…The Gadolinium complex of the [hydroxy(4-pyridyl)methyl] phosphonate ligand, Gd{(4-C 5 H 4 N)CH(OH)PO 3 H} 3 ·6H 2 O reported by Zheng and coworkers [38] has a 1D chain structure in which each pair of GdO 6 octahedra is bridged by three O-P-O linkages. The amine and the hydroxyl groups of the ligand are not involved in metal coordination but participate in the interchain hydrogen bonding.…”

Reaction of an anthracene-based cyclic phosphonate ester with trimethylsilyl bromide unexpectedly generating two phosphonates: syntheses, crystal structures and fluorescent properties

“…C-OH). 16 This suggests that molecular structures of 1-3 are different, which was further confirmed by their 1 H NMR spectra (ref. 8,Fig.…”