Reversible and selective amine interactions of [Cd(μ₂-N,O-p-NH₂C₆H₄SO₃)₂(H₂O)₂]n

Abstract

[Cd(mu2-N,O-p-NH2C6H4SO3)2(H2O)2]n (1) is a layered coordination compound. The solid-vapor reactions between crystalline 1 and a series of volatile amines were investigated and the corresponding amine adducts were characterized by EA, TGA, PXRD and IR. Among them, the C2H5NH2 and C3H7NH2 adducts, namely [Cd(C2H5NH2)4(H2O)2](H2NC6H4SO3)2 (3) and [Cd(C3H7NH2)4(O-p-H2NC6H4SO3)2].C3H7NH2 (4), grew into single crystals in situ from the solid-vapor reaction processes and their crystal structures were characterized. In both cases, 4 mol equiv. of amine molecules coordinate to Cd(II) via replacing the N,O-p-NH2C6H4SO3 ligands or coordinated water molecules. The single-phase product suggests that the solid-vapor reaction between the metal sulfonate and volatile alkylamines could be used as a green process to synthesize monoamine-coordinated Cd(II) complexes without any solvent and routine separation. Finally, the substitution reaction is reversible at room conditions and selective for primary alkylamines.

Synthesis, characterization and spectroscopic studies of 2,2″-bipyridyl complexes of metal benzenesulfonates

“…The average C--C (1.40 A) and C-N bonds (1.34 A) and angles (120 ) within the rings are in agreement with those previously reported for bpy-coordinated Mn(II) complexes [26][27][28]. The dihedral angle between the bpy mean planes is 88.19 (5) .…”

“…Up to now, several groups have studied the coordination chemistry of transition metal sulfonates and their solid-state properties. In these studies, the sulfonate group has not generally coordinated to transition metal ions because of the weak coordinating strength of the sulfonate ions [4][5][6] especially in aqueous solution. In some cases, sulfonate group can compete with water molecule and coordinate rarely to metal ion under the certain conditions [7,8].…”

Crystal structure of bis(4-aminobenzenesulfonato-κN)bis(2,2'-biimidazole- κ2N,N')copper(II)-dihydrate (1:2), [Cu(C6H6N4)2(C6H6O3NS)2]·2H2O, C24H28CuN10O8S2

“…In comparison with other organic acid anions, such as carboxylates [1] and phosphonates, organosulfonates have received less attention in coordination chemistry due to the perception that sulfonates are poor ligands. The sulfanilate anions can coordinate to transition metals through both the amine [2] and the sulfonate group [3]. In addition, the sulfanilate anion can act as a hydrogen-bond acceptor and donor [4,5].…”

Crystal structure of triaquatriimidazolenickel(II) naphthalene-2,6- disulfonate monohydrate, [Co(C3H4N2)3(H2O)3][C10H6S2O6] ·` H2O

“…Sulfonate complexes have received much attention due to their potential application as functional materials [1,2]. Therefore, the efforts of many groups have produced ap lethora of sulfonate structural motifs.…”