Toward the Construction of Functional Solid-State Supramolecular Metal Complexes Containing Copper(I) And Silver(I)

Silica-Organometallic One-Dimensional Hybrid Employing a Ag-πC═C Bond Connecting Alternating Ag4(NO3)4 and Octavinylsilsesquioxane

Layering AgNO₃ in alcohol onto octavinylsilsesquioxane (OVS) in CHCl₃ results in a one-dimensional coordination polymer, {Ag₄(NO₃)₄(OVS)·solvents}_n (SD/Ag4a-d), consisting of unprecedented flat weakly bonded Ag₄(NO₃)₄ alternating with the firmly covalent OVS through Ag^I-π_C═C bonds. The preferential assembling medium for SD/Ag4a is proven to be alcohols, where a 4:1 silver-OVS adduct is detected by electrospray ionization mass spectrometry. The present outcomes may assist our knowledge of particular interactions for supramolecular architectures of a polynuclear silver system built from OVS containing eight pendent olefin tails.

A Cationic Silver Pyrazine Coordination Polymer with High Capacity Anion Uptake from Water

We report the first example of linker modification for an N-donor Ag-based cationic material while maintaining and in some cases increasing the anion exchange capacity. Cationic silver(I) pyrazine nitrate selectively traps harmful oxo-anions from water such as permanganate, perrhenate and a variety of α,ω-alkanedicarboxylates. We chose these anions as initial examples of exchange for potential water purification. The host-guest interaction between the cationic layers of π-stacked silver pyrazine polymers and the incoming/outgoing interlamellar anions allows for the exchange. The exchange capacity over 24 h reached 435 and 818 mg/g for permanganate and perrhenate, respectively, a record for a crystalline metal-organic material and over five times the exchange capacity compared to commercial resin. The material also undergoes organic exchange as an analog for pharmaceutical waste, some of which have a carboxylate functionality at the neutral pH range typical of natural water sources. Both the as-synthesized and exchanged materials are characterized by a variety of analytical techniques.

A Schiff base platform: structures, sensing of Zn(ii) and PPi in aqueous medium and anticancer activity

A Schiff base platform was explored to present structural aspects of its Zn(ii) and Cd(ii) coordination compounds, sensing behavior towards Zn(ii) and PPi in aqueous medium and anticancer activity.

Structural characterization of copper complexes with chiral 1,2,4-triazine-oxazoline ligands

The crystal structure determination of oxazoline-1,2,4-triazine ligand

Synthesis and structural characterization of silver(i), copper(i) coordination polymers and a helicate palladium(ii) complex of dipyrrolylmethane-based dipyrazole ligands: the effect of meso substituents on structural formation

A striking difference in the structures of silver complexes was observed because of the different substituents at the meso carbon atom of the dipyrrolylmethane-based ligand.

Anion...π interactions in copper(I) chloride and bromide coordination polymers bearing 1,4-bis(pyridazin-4-yl)benzene ligands

In poly[[μ4-1,4-bis(pyridazin-4-yl)benzene-1:2:3:4κ4N1:N2:N1′:N2′]di-μ2-chlorido-dicopper(I)], [Cu2Cl2(C14H10N4)]n, (I), and its isomorphous bromide analogue, [Cu2Br2(C14H10N4)]n, (II), the organic ligand is situated across a centre of inversion. The CuIcations adopt a distorted tetrahedral [CuN2X2] [X= Cl in (I) or Br in (II)] environment [Cu—N = 2.0183 (14)–2.0936 (14) Å; Cu—Cl = 2.2686 (6) and 2.4241 (5) Å; Cu—Br = 2.4002 (6) and 2.5284 (5) Å] and the primary coordination motif consists of cuprohalogenide chains accommodating μ-pyridazine groups. The organic ligands are tetradentate and link the inorganic chains into corrugated layers. Their packing is influenced by interlayer anion...π interactions [Cl...π = 3.540 (2) Å and Br...π = 3.593 (2) Å] with the electron-deficient pyridazine rings. This kind of interaction precludes the characteristic slipped π–π stacking and close parallel alignment of the organic tectons; it may be involved as a structure-defining factor for coordination layers based upon lengthy polyaromatic linkers.

Anion dependent silver(i) complexes of pyrazine mono-N-oxide

Pyrazine mono-N-oxide reacts with silver salts to form either discrete complexes involving monodentate N-coordination or 1D coordination polymers in which the ligand acts in a N,O-bridging bidentate coordination mode.

Pyridine N-oxide: a hyperdentate argentophile

Pyridine N-oxide reacts with silver(i) perchlorate monohydrate in three different stoichiometric ratios to produce three very different 1-D coordination polymers.

Cadmium(II) chloride, bromide and iodide complexes with 4,4′-bipyridazine: when are diazine and halide bridges (in)compatible?

In poly[di-μ-chlorido-μ-(4,4′-bipyridazine)-κ2N1:N1′-cadmium(II)], [CdCl2(C8H6N4)]n, (I), and its isomorphous bromide analogue, [CdBr2(C8H6N4)]n, (II), the halide atom lies on a mirror plane and the CdIIion resides at the intersection of two perpendicular mirror planes withm2msite symmetry. The pyridazine rings of the ligand lie in a mirror plane and are related to each other by a second mirror plane perpendicular to the first. The compounds adopt the characteristic structure of the [MIIX2(bipy)] type (bipy is bipyridine) based on crosslinking of [Cd(μ-X)2]nchains [Cd—Cl = 2.5955 (9) and 2.6688 (9) Å; Cd—Br = 2.7089 (4) and 2.8041 (3) Å] by bitopic rod-like organic ligands [Cd—N = 2.368 (3)–2.380 (3) Å]. This feature is discussed in terms of supramolecular stabilization, implying that the periodicity of the inorganic chain [Cd...Cd = 3.7802 (4) Å in (I) and 3.9432 (3) Å in (II)] is favourable for extensive parallel π–π stacking of monodentate pyridazine rings, with centroid–centroid distances of 3.7751 (4) Å in (I) and 3.9359 (4) Å in (II). This is not the case for the longer iodide bridges, which cannot stabilize such a pattern. In poly[tetra-μ-iodido-μ4-(4,4′-bipyridazine)-κ4N1:N2:N1′:N2′-dicadmium(II)], [Cd2I4(C8H6N4)]n, (III), the ligands are situated across a centre of inversion; they are tetradentate [Cd—N = 2.488 (2) and 2.516 (2) Å] and link successive [Cd(μ-I)2]nchains [Cd—I = 2.8816 (3)–3.0069 (4) Å] into corrugated layers.