Synthesis of Hofmann-type Zn(H2O)2Ni(CN)4.nG (G = water and 1,4-dioxane)clathrates and the determination of their structural properties by variousspectroscopic methods

Abstract

Two new 2-dimensional cyanide-bridged coordination polymers [Zn(H 2 O) 2 Ni(CN) 4 6(H 2 O) and Zn(H 2 O) 2 Ni(CN) 4 3(C 4 H 8 O 2) ], which were similar to Hofmann-type clathrates, were synthesized based on [Ni(CN) 4 ] 2− and Zn 2+ as building blocks. These substances were synthesized as compounds in crystalline form. Thes tructures of the crystalline compounds were characterized via their spectral analyses. General information about the structures of the newly obtained Hofmann-type clathrates was obtained from their vibration spectra by considering significant changes in the vibration peaks of the cyanide group, water ligand molecule, and guest molecules (water and 1,4-dioxane). The thermal behavior of the Hofmann-type clathrates was investigated in the range of 25-500°C. In addition, experimental data on the magnetic properties of the Hofmann-type clathrates were obtained using the Gouy method under normal conditions. Information on the properties of the structures of the Hofmann clathrates was obtained by applying the single crystal diffraction technique. The asymmetric unit of the first Hofmann-type clathrate contained 1 Zn(II) ion, 1 Ni(II) ion, 1 cyanide ligand, 1 water ligand molecule, and 2 guest water molecules. The asymmetric unit of the second Hofmann-type clathrate contained 1 Zn(II) ion, 1 Ni(II) ion, 2 cyanide ligands, 1 water ligand molecule, and 2 half guest 1,4-dioxane molecules.

Synthesis, spectroscopic, thermal, crystal structure properties and characterization of new Hofmann-type-like clathrates with 4-aminopyridine and water

“…The Ni(II) ion is coordinated by four carbon atoms [Ni-C bond range between 1.848( 11)-1.867( 8) Å] from cyanide ligands, thus showing a square planar coordination geometry. These Ni-C distances have been found by other researchers to be approximately 1.865(4), 1.877(3) and 1.881(3) Å in various complex structures, just as in complex 1 [37,38].…”

“…The Ni(II) ion is coordinated by four carbon atoms [Ni1-C4 = 1.858(13) Å and Ni1-C5 = 1.868( 14) Å] from cyanide ligands, thus showing a square planar coordination geometry. These Ni-C distances belonging to the Ni(CN) 4 group were found to be approximately 1.865(4), 1.877(3) and 1.881(3) Å in complex structures by other researchers with different metal atoms and different ligand molecules [37,38]. As can be clearly seen from Figures 1 and 2, two of the four cyanide groups in the square planar Ni(CN) 4 structure, mutually positioned with respect to the nickel atom, are attached to the zinc metal atoms by their nitrogen atoms.…”

“…Some of these 33 normal vibration modes of the 4AP are strongly influenced by its composition with other molecules or metal atoms [16,18,22 and 26]. Examples of these vibration modes are the stretching and bending vibrations of the NH 2 group [28,[37][38][39] and the stretching with in plane bending vibrations of the [C(1) ═ N(1)-C(5)] group which at the pyridine ring [18,25 and 26]. The wavenumbers (or at the same time frequencies) of these vibration modes shift a considerable amount of either to a high value or to a low value by the combination of the 4AP with other molecules or metal atoms in the complexes 1 and 2.…”

Synthesis And Characterization of Two New Hofmann-Type-Like Compounds From Some Alkali Metal Atoms And Glycine Anhydride

“…As the number of amino acids in a peptide's structure increases, both the structure and chemical function of that peptide increase. If the number of amino acids in the structure of a peptide is more than about fifty, that peptide is known as a "polypeptide", that is, a "protein" (21). Proteins are chemical compounds that are very valuable in terms of the vital behavior of living things.…”

Synthesis, Structures, and Magnetism of Four One-Dimensional Complexes Using [Ni(CN)4]2− and Macrocyclic Metal Complexes

“…Cyano-bridged complexes with superior magnetic properties can be constructed using cyano complexes, such as [Ag(CN) 2 ] − , [Cu(CN) 3 ] 2− , [M(CN) 4 ] 2− (M = Cd, Ni, Pd, and Pt), and [M(CN) 6 ] 3− (M = W, Mo, and Fe) [5][6][7][8][9][10][11][12][13][14][15]. Studies on tetracyanometallate anions [Ni(CN) 4 ] 2− exhibiting bridging characteristics with either one or two of the cyano groups have been reported [16][17][18][19][20][21][22][23][24][25][26][27][28].…”