Coordination Polymers in Dicyanamido-Cadmium(II) with Diverse Network Dimensionalities

Abstract

The synthesis and structural characterization of six dicyanamido-cadmium(II) complexes are reported: catena-[Cd(μ1,3-dca)(μ1,5-dca)(3-ampy)] (1), catena-[Cd3(μ1,3,5-dca)2(μ1,5-dca)4(pyNO)2(H2O)2] (2), catena-{Cd(H2O)2(μ1,5-dca)2](2,6-lut-NO)} (3), catena-[Cd(Me2en)(μ1,5-dca)2] (4), catena-[Cd(Me4en)(μ1,5-dca)2] (5), and [Cd(1,8-damnp)2(dca)2] (6), where dca = dicyanamide anion, 3-ampy = 3-aminopyridine, pyNO = pyridine-N-oxide, 2,6-lut-NO = 2,6-lutidine-N-oxide, Me2en = N,N-dimethyl-ethylenediamine, Me4en = N,N,N′,N′-tetramethyl-ethylenediamine, and 1,8-damnp = 1,8-diaminonaphthaline. The coordination polymers have different dimensionalities: 1 and 5 form 3D networks structures; 3 and 4 form polymeric 1D chains and 1DD double chains, respectively. Ribbons of three fused polymeric chains are observed in 2. In 6, the mononuclear complex units form a hydrogen-bonded supramolecular 3D network. In the coordination polymer compounds, the dca linkers display three bonding modes: the most common μ1,5-dca and the least popular μ1,3- and μ1,3,5-dca bonding. The luminescence emission and thermal properties of the complexes were investigated.

Synthesis, characterization, thermal, anticancer studies, and density functional theory for potentially active pyrimidine‐based complexes

“…The complexes' molar conductance indicated that all complexes except Sm(III) were electrolytes. The conductance value of Co(II), Ni(II), and Zn(II) chelates revealed 1:2 and of Cu(II) complex revealed 1:1 24 …”

“…The conductance value of Co(II), Ni(II), and Zn(II) chelates revealed 1:2 and of Cu(II) complex revealed 1:1. 24 T A B L E 1 Physicochemical data for the (H 4 L) ligand and its metal chelates.…”

A three-dimensional Mn(ii) coordination polymer with ferroelasticity obtained by introducing coligands to form novel networks

“…The dca ligands exhibit two different bonding modes, μ-1,5- and μ-1,3,5-bridging, creating a 3D network structure. 22 The μ-1,5- and μ-1,3,5-bridging dca anions form 2D planes, which are further connected by μ-1,5-bridging anions, resulting in interlaced 3D networks (Fig. 2b).…”

“…21 The networks formed by of small pseudo halides (N 3 − , NCS − and NCO − ) and the longer dicyandiamide, dca (dca = N(CN) 2 − ), with divalent metal( ii ) are considered to be the most studied pseudo halide compound networks. 22 Our group successfully synthesized [Et 3 ( n -Pr)P][Cd(dca) 3 ], [Et 3 P(CH 2 ) 2 Cl][Cd(dca) 3 ], and [Et 3 P(CH2) 2 F][Cd(dca) 3 ] ferroelastic compounds using the cation templates of anionic metal-dca (M-dca) networks. 23–25 These compounds all employ each metal( ii ) atom coordinated to the six terminal N atoms of the dca ligand, forming a distorted octahedral geometry.…”

Synthesis, Characterization and Antibacterial Properties of Complex [Ag(SCN)(2-NH2py)]

“…Complexes with 2-,3-or 4-NH2py ligands show that NH2py tends to act as a monodentate ligand by binding to the central atom via the N pyridine ring. Complexes that have been reported such as [Ni(NCS)2(2-NH2py)2.C4H10O] [7], {∞[Cd(µ-SCN)2(4-NH2py)2]} [8], [Cu(SCN)2(x-NH2py)2] (x=2,3, or 4) [4], and [M(3-NH2py)2(dca)2] (M=Mn2+, Cu2+,Cd2+, or Co2+; dca = dicyanamide) [1,[9][10][11], [AgL(x-NH2py)2] [12][13][14][15][16] demonstrated the formation of polymer complexes via bridge formation by bidentate ligands such as dicyanamide, thiocyanate and azide. Several other complexes with monodentate ligands such as Cl¬ such as…”