Aqua substitution from mononuclear Pt(II) complexes with 2-(pyrazol-1-ylmethyl)quinoline non-leaving ligands

The rates of aqua substitution from [Pt{2-(pyrazol-1-ylmethyl)quinoline}(H₂O)₂](ClO₄)₂, [Pt(H₂Qn)], [Pt{2-(3,5-dimethylpyrazol-1-ylmethyl)quinoline}(H₂O)₂](ClO₄)₂, [Pt(dCH₃Qn)], [Pt{2-[(3,5-bis(trifluoromethyl)pyrazol-1-ylmethyl]quinoline}(H₂O)₂](ClO₄)₂, [Pt(dCF₃Qn)], and [Pt{2-[(3,5-bis(trifluoromethyl)pyrazol-1-ylmethyl]pyridine}(H₂O)₂](ClO₄)₂, [Pt(dCF₃Py)], with three sulfur donor nucleophiles were studied. The reactions were followed under pseudo-first-order conditions as a function of nucleophile concentration and temperature using a stopped-flow analyzer and UV/visible spectrophotometry. The substitution reactions proceeded sequentially. The second-order rate constants for substituting the aqua ligands in the first substitution step increased in the order Pt(dCH₃Qn) < Pt(dCF₃Qn) < Pt(H₂Qn) < Pt(dCF₃Py), while that of the second substitution step was Pt(dCH₃Qn) < Pt(dCF₃Qn) < Pt(dCF₃Py) < Pt(H₂Qn). The reactivity trends confirm that the quinoline substructure in the (pyrazolylmethyl)quinoline ligands acts as an apparent donor of electron density toward the metal center rather than being a π-acceptor. Measured pK_a values from spectrophotometric acid–base titrations were Pt(H₂Qn) (pK_a1 = 4.56; pK_a2 = 6.32), Pt(dCH₃Qn) (pK_a1 = 4.88; pK_a2 = 6.31), Pt(dCF₃Qn) (pK_a1 = 4.07; pK_a2 = 6.35), and Pt(dCF₃Py) (pK_a1 = 4.76; pK_a2 = 6.27). The activation parameters from the temperature dependence of the second-order rate constants support an associative mechanism of substitution.     

Construction of acetate-bridged dicopper(II) hybrid organic–inorganic networks with calix[4]arene-derived nitrogenous ligands

The reactions of mono-, bis- and tetrapicolyl-p-tert-butylcalix[4]arene derivatives functionalised in the phenolic positions (L ¹ –L ⁴ ) with copper(II) acetate resulted in the formation of discrete complexes or extended coordination polymers. The centrosymmetric dimer [Cu₂(μ-O₂CCH₃)₄(L ¹ )₂] 1, obtained with monodentate L ¹ , has square pyramidal coordination around the copper centres and a cone conformer of monopicolyl-calix[4]arene acting as an axial ligand, with a molecule of acetonitrile hosted within its cavity. The potentially bidentate L ² acts as a monodentate ligand, affording the complex [Cu₂(μ-O₂CCH₃)₄(L ² )₂] 2, which based on spectroscopic and combustion analysis data has a similar coordination sphere around Cu(II). Compound L ³ bridges two dicopper units in the coordination polymer [Cu₂(μ-O₂CCH₃)₄(μ-L ³ )] _n 3, with the calixarene hosting a molecule of tetrahydrofuran. Finally, compound L ⁴ reacts with 4 equivalents of copper(II) acetate, presumably generating a two-dimensional coordination polymer formulated as [{Cu₂(μ-O₂CCH₃)₄}₂(L ⁴ )] 4.     

A quest for stable 2,2,9,9-tetrahaloplumbacyclonona-3,5,7-trienylidenes at density functional theory

In contrast to cyclonona-3,5,7-trienylidene (1_H) which turns out as a boat-shaped transition state for having a negative force constant, its heavier plumbylenic analogous (2_X) where X = H, F, Cl, Br, and I emerge as boat-shaped minima. This unsubstituted carbene has a triplet ground state while exclusive of 2_I which initially takes on a triplet multiplicity and eventually transforms to a less stable intramolecular ring opening product; all of the plumbylenes (2_H, 2_F, 2_Cl, and 2_Br) have a singlet ground state. Hence, stability anticipated by the singlet (S)–triplet (T) splitting (ΔE_S-T) decreases by going down in the group 17 column: 2_Br > 2_Cl > 2_F > 2_H > 1_H > 2_I. Also, the HOMO-LUMO gap (ΔE_HOMO-LUMO) increases as a result of substituting. From a thermodynamic perspective, our scrutinized 2_Br, 2_Cl, and 2_F are found 1.5–2 times more stable than that of the reported cyclopenta-2,4-dienplumbylene and 2,5-bis(halobora)-cyclopentenplumbylenes analogues, respectively. From a kinetic perspective, these nine-membered plumbylenes are found 20–26 kcal/mol more stable than that of their corresponding five-membered congeners. The NBO analysis on stable singlet 2_Br shows that there is a mesomeric interaction between bromine lone-pair electron and the Pb divalent atom of 2_Br with bonding (σ) and anti-bonding (σ^*) orbitals of carbon–bromine and carbon–lead. The main stabilizing effect appears to be π- and σ-bond hyperconjugation among the iodine heteroatom and divalent center of triplet 2_I. This research signifies the thermodynamic and kinetic stabilities of the biggest unsaturated cyclic plumbylenes hoping to prompt the experimental attention toward them.

     

Liquid crystalline guanidinium phenylalkoxybenzoates: towards room temperature liquid crystals via bending of the mesogenic core and the use of triflate counter ions

A series of guanidinium salts 1(C _n ) _m –4(C _n ) _m ?X bearing phenyl alkoxybenzoate cores have been synthesised and their mesomorphic properties have been investigated by polarising optical microscopy (POM), differential scanning calorimetry (DSC) and powder X-ray diffraction experiments (small-angle X-ray scattering and wide-angle X-ray scattering). While compounds 1(C₁₂)₁?X and 3(C₁₂)₁?X with one alkoxy chain showed smectic A (SmA) phases irrespective of the counter ion, compounds 1(C₁₂)₂?OTf and 3(C₁₂)₂?OTf with two alkoxy chains displayed SmA phases and the corresponding chlorides 1(C₁₂)₂?Cl and 3(C₁₂)₂?Cl displayed Col_h. Guanidinium salts 1(C _n )₃–4(C _n )₃?X with three alkoxy chains showed Col_h phases. Whereas the use of cyclic guanidinium head groups rather than acyclic ones had only a minor influence on the mesophase properties, melting points were significantly decreased by bent core units instead of linear core units. Replacement of chloride counterions by triflate lead to a further depression of the clearing points and shifted the mesophase towards room temperature.     

Synthesis,structural studies,and antibacterial activity of zinc,copper, and silver complexes derived from N′-(1-(pyrazin-2-yl)ethylidene)isonicotinohydrazide

The multidentate Schiff-base ligand N′-(1-(pyrazin-2-yl)ethylidene)isonicotinohydrazide (HL) has been prepared. Reaction with zinc, copper, and silver nitrate afford three complexes, [Zn(HL′)₂](NO₃)₂·3H₂O (1), {[Cu₂(L)₂(NO₃)(H₂O)₂]·NO₃}_n (2) and {[Ag₂(L)₂]·3H₂O}_n (3). These complexes have been characterized by elemental analysis, IR spectroscopy, and single-crystal X-ray diffraction. In 1, HL is a neutral tridentate ligand, whereas in 2 and 3, HL is a deprotonated tetradentate ligand. The hydrogen bonding interactions between NO₃^? and the host framework result in various supramolecular polymeric structures: a 2-D layer for 1 and 3-D network for 2 and 3. The antibacterial activities of these complexes have been investigated and the results indicate that 3 showed good antibacterial activities.     

Polymerizations of methyl methacrylate and rac-lactide by zinc(II) precatalyst containing N-substituted 2-iminomethylpyridine and 2-iminomethylquinoline

The reaction of [ZnCl₂] with N-cyclopentyl-1-(quinolin-2-yl)methanimine (L_A), N-cyclohexyl-1-(quinolin-2-yl)methanimine (L_B), N-cyclohexyl-1-(pyridin-2-yl)methanimine (L_C), 2,6-diethyl-N-(pyridin-2-ylmethylene)aniline (L_D), N-cyclopentyl-1-(pyridin-2-yl)methanimine (L_E), and N-phenyl-(pyridin-2-yl)methanimine (L_F) in ethanol produced the bidentate [(NN′)ZnCl₂] complexes, [L_AZnCl₂], [L_BZnCl₂], [L_CZnCl₂], [L_DZnCl₂], [L_EZnCl₂] and [L_FZnCl₂], respectively. The molecular structures revealed that the zinc in [L_nZnCl₂] (L_n = L_A ? L_D) showed a distorted tetrahedral geometry involving two nitrogens of N,N’-bidentate ligands and two chloride ligands. Most of these initiators were effective for polymerization of methyl methacrylate (MMA) and polymerization of rac-lactide (rac-LA). [L_CZnCl₂] (with N-cyclohexyl substituted at imine-pyridine moiety) exhibited the highest catalytic activity for MMA polymerization in the presence of modified methylaluminoxane (MMAO) with an activity of 3.33 × 10⁴ g PMMA/mol·Zn·h at 60 °C, giving moderate syndiotactic poly methyl methacrylate (PMMA) with high molecular weight (9.62 × 10⁵ g/mol). The dimethyl derivatives [L_nZnMe₂] (L_n = L_A ? L_F), generated in situ, polymerized rac-LA with moderate activity and yielded a polylactide (PLA) with good number-average molecular weights and narrower polydispersity indices (PDIs). [L_AZnMe₂] effectively initiates the ring-opening polymerization (ROP) of rac-LA to attain heterotactic PLA (P_r = 0.91).     

New Ni(II) complexes based on N′NN′ pincer ligands: syntheses,structures and B–F cleavage of BF4− promoted by a di-cationic Ni(II) center

A neutral complex [Ni(L1)Cl₂] (1) with trigonal bipyramidal geometry at Ni(II) was prepared by the reaction of NiCl₂ with 2,6-bis(isopropylaminomethyl)pyridine (L1) in THF and then a mono-cationic complex [Ni(L1)Cl](BF₄) (2) and di-cationic complex [Ni(L1)(CH₃CN)₃](BF₄)₂ (3) could be obtained by extracting one or two Cl^? ions from 1 with one or two equivalents of AgBF₄ in THF or acetonitrile, respectively. Similarly, a neutral complex Ni(L2)Cl₂ (4) was formed by reaction of NiCl₂ with 2,6-bis(diethylaminomethyl)pyridine (L2), and the experimental results indicate that Ni(II) of 4 adopts a slightly distorted square pyramidal geometry, which is different from that of 1. Although the reaction of 4 with one equivalent of AgBF₄ resulted in a mono-cationic complex, [Ni(L2)Cl]BF₄ (5), with Ni(II) in a slightly distorted square planar coordination geometry, an unexpected dinuclear Ni(II) complex [Ni(L2-H)(MeOH)F(μ-F)]₂(BF₄)₂ (6) with two fluoride ligands bridging the two Ni(II) centers rather than a di-cationic Ni(II) complex was formed by extracting two Cl^? anions from 4 through the reaction with two equivalents of AgBF₄ in methanol. Complexes 1–6 were characterized by elemental analysis and IR, and structures of 1, 3, 4, 5, and 6 were confirmed by X-ray diffraction analysis.     

Three lanthanide complexes with mixed salicylate and 1,10-phenanthroline: syntheses,crystal structures,and luminescent/magnetic properties

Three new lanthanide complexes incorporating salicylate (HSA or SA) and 1,10-phenanthroline (phen), Ln₃(HSA)₅(SA)₂(phen)₃ [Ln = Ho (1) and Er (2)], and Sm₂(HSA)₂(SA)₂(phen)₃ (3), have been synthesized. X-ray structural analysis reveals that 1 and 2 are isostructural with a trinuclear pattern, and 3 exhibits a binuclear structure. Comparison of the structural differences between 1/2 and 3 suggests that the identity of metal plays an important role in construction of such complexes. The magnetic properties of 1 are discussed. Moreover, 2 and 3 are both photoluminescent materials, and their emission properties are closely related to their corresponding Ln^III centers.     

Coordination polymers of lanthanides incorporating N,N′-ethylenebis(2-hydroxy-1-naphthylideneiminato): syntheses and crystal structures

Reaction of Ln(NO₃)₃?·?6H₂O with H₂napn (H₂napn?=?N,N′-ethylenebis(2-hydroxy-1-naphthylideneiminato)) and KSCN produces seven new coordination polymers, [La(H₂napn)(SCN)(C₂H₅OH)₂(NO₃)₂] _n (1), [La(H₂napn)₂(SCN)(NO₃)₂] _n (2), and [Ln(H₂napn)_1.5(NO₃)₃] _n [Ln?=?La(3), Sm(4), Eu(5), Dy(6), Er(7)]. Crystal structure analysis reveals that H₂napn functions as a bridging ligand, forming a 1-D chain polymer (1) and 2-D open-frameworks (2–7) with lanthanides. Each metal center of 1–7 is nine-coordinate. Lanthanide contraction is observed in 3–7.     

Diverse structures,magnetism and photoluminescence of four transition metal coordination compounds based on the semirigid 4-(pyridin-3-yloxy)-phthalic acid

Four transition metal coordination compounds, {[Co(PPDA)(H₂O)₂]}_n (1), {[Ni(HPPDA)₂]}_n (2), {[Cd(PPDA)(H₂O)]?H₂O}_n (3), and {Zn(HPPDA)₂(H₂O)₄}_n (4), were synthesized by assembling transition metal salts with a semirigid ligand 4-(pyridin-3-yloxy)-phthalic acid (H₂PPDA) under hydrothermal conditions. The compounds have been characterized by elemental analyses, IR spectra, TGA, powder X-ray diffraction, and single-crystal X-ray crystallography. Compound 1 exhibits a three-connected 2-D layered structure, 2 shows a (3,6)-connected 2-D layered structure, 3 displays a (3,6)-connected 2-D layered framework based on binuclear units, and 4 is a mononuclear structure, connected to generate a 3-D supramolecular architecture by hydrogen bonds. Compound 2 is thermally stable up to 300 °C. The magnetic properties of 1 and photoluminescent properties of 3 and 4 have been explored.     

A series of Keggin-based AgI-belt/cycle structures constructed from 5-phenyl-1H-tetrazole and its derivative through Ag–N and Ag–C bonds

Three Keggin-based compounds containing Ag^I belts and cycles constructed from 5-phenyl-1H-tetrazole (L¹) and its derivative 5-m-tolyl-1H-tetrazole (L²), [Ag₉L¹₅(PW^VW^VI₁₁O₄₀)]·H₂O (1), [Ag₁₁L¹₆(H₂O)₂(SiMo^VMo^VI₁₁O₄₀)] (2) and [Ag₁₀L²₈(HPMo₁₂O₄₀)]·H₂O (3), have been synthesized under hydrothermal conditions and characterized by IR spectra and single crystal X-ray diffraction. Compound 1 shows a channel-like 3-D metal-organic framework with Keggin anions in channels. Adjacent layers of 2 share the same anions to construct a 3-D framework. Compound 3 has a 2-D metal-organic layer containing Ag^I cycles. Adjacent layers link through sharing Ag–N bonds and a channel-like 3-D framework is formed. Electrochemical and photocatalytic properties of 1–3 have been studied. The experimental results show that 1–3 have excellent catalytic performance for reduction of nitrite and bromate and also have photocatalytic properties for degradation of MB and RhB.     

Structural diversity of a series of urea-based coordination complexes: from water tapes,water-sulfate chains,to supramolecular structures

[Hg₂(L₁)₂I₄] (1), [Cd₂(L₁)₂I₄] (2), {[Cd(L₁)₂(SO₄)(H₂O)]·4H₂O}_n (3), {[Zn₂(L₂)₂(Cl)₄]·0.5H₂O} (4), {[Cu₂(L₂)₂(SO₄)₂(H₂O)₄]·2.5H₂O} (5), and {[Cd(L₂)₂(SO₄)(H₂O)]·3H₂O}_n (6), based on N–(3–picolyl)–N′–(3–pyridyl)urea (L₁) or N–(4–picolyl)–N′–(3–pyridyl)urea (L₂), have been synthesized and characterized by elemental analyses, IR spectra, single-crystal and powder X-ray diffraction, and thermogravimetric analyses. Complexes 1 and 2 are isomorphous and feature similar rectangular metal organic loops, which were further extended into 2-D supramolecular structures through hydrogen bonds. Complex 3 possesses a 2-D sql sheet, and the channels between the neighboring sheets are filled with lattice water molecules, which formed a 1-D water tape. Complex 4 also exhibits a rectangular metal organic loop and a 3-D supramolecular structure with the help of hydrogen bonding interactions. Complex 5 also possesses a metal organic loop, and the water molecules interacted with sulfates, constructing a 1-D water–sulfate tube. Complex 6 features a 1-D loop polymeric chain. Moreover, the solid state luminescences of 1–4 and 6 have been investigated.     

Theoretical study on the mechanism of OH + HCNO reaction

A detailed mechanistic study of the OH + HCNO reaction, in which the products P _i with i=1, 2, . . . ,7 are involved, is carried out by means of CCSD(T)/6-311G(d,p)//B3LYP/6-311G(d,p)+ZPVE computatio-nal method to determine a set of reasonable pathways. It is shown that P ₆ (CO + H₂NO) and P ₃ (HNO +HCO) are the major product channels with a minor contribution from P ₅ (NO + H₂CO), whereas the other channels for P ₁ (H₂O + NCO), P ₂ (NH₂ + CO₂), P ₄ (HCN + HO₂) and P ₇(CO + H₂ + NO) are less favorable. All these theoretical results are in harmony with experimental facts.     

The effect of mesogenic and non-mesogenic crosslinking units on the phase behaviour of side-chain smectic and cholesteric elastomers

Chiral monomer (M₁ ), mesogenic and non-mesogenic crosslinking agents (C₁ and C₂ ), and the corresponding liquid crystalline elastomers (P₁ and P₂ series), have been synthesised. Their chemical structures have been characterised by Fourier transform infrared or ¹H nuclear magnetic resonance and their phase behaviour investigated by differential scanning calorimetry, polarising optical miscoscopy, thermo-gravimetric analysis (TGA) and X-ray diffraction. The effect of the crosslinking unit on the phase behaviour of the elastomers has been studied. M₁ showed a cholesteric oily streak and focal conic texture. C₂ exhibited a nematic enantiotropic thread-like and schlieren texture, and a monotropic fan-shaped texture in the S_A phase. Due to the introduction of the mesogenic crosslinking unit, elastomers, P_2-1 ?P_2-5 , exhibited a cholesteric phase, while elastomers, P_1-1 ?P_1-4 , derived from a non-mesogenic crosslinking unit, exhibit a S_A phase. As the content of the crosslinking unit increased, the T _g of the P₁ series initially decreased and then increased, and the T _i of the series decreased. In the P₂ series the T _g increased, but the T _i initially increased and then decreased. TGA confirmed that all the elastomers had improved thermal stability.     

Structural and luminescent properties of a series of Cd(II) pyridyl benzimidazole complexes that exhibit extended three-dimensional hydrogen bonded networks

Five new coordination complexes, [CdI₂(3-PyBim)](H₂O)₃ (1), [Cd(SO₄)(3-PyBim)(H₂O)₄] (2), [CdCl₂(4-PyBim)₂(H₂O)₂] (3), [CdBr₂(4-PyBim)₂(H₂O)₂] (4) and [CdI₂(4-PyBim)₂(H₂O)₂] (5) [3-PyBim=2-Pyridin-3-yl-1H-benzoimidazole, 4-PyBim=2-Pyridin-4-yl-1H-benzoimidazole], were obtained under hydrothermal conditions and characterized by single crystal X-ray diffraction, IR, elemental analysis, and powder X-ray diffraction. All of the complexes have mononuclear structures. Among the crystal structures of these complexes, there exist a variety of intermolecular hydrogen bonding interactions and π?π interactions, which further extend to a 3-D supramolecular architecture. The solid state photoluminescent properties of 1–5 vary with the electronegativity of the coordination anion. Additionally, the thermogravimetric analyses of these complexes are discussed.     

New chiral liquid crystal monomers and cholesteric polyacrylates: synthesis and characterisation

The synthesis of new chiral monomers (M₁ ?M₃ ) based on menthol and the corresponding polyacrylates (P₁ ?P₃ ) is described. The chemical structures, formula and phase behaviour of the obtained monomers and polymers were characterised with FT-IR, ¹H-NMR, elemental analyses, differential scanning calorimetry (DSC), polarising optical microscopy (POM) and X-ray diffraction (XRD). The effect of the mesogenic core rigidity, spacer length and menthyl steric effect on the phase behaviour of M₁ ?M₃ and P₁ ?P₃ is discussed. The expected mesophase of the compounds based on menthol can be obtained by inserting a flexible spacer between the mesogenic core and the terminal groups. For the chiral monomers and polyacrylates, their corresponding melting temperature (T _m), glass transition temperature (T _g) and clearing temperature (T _i) increased with an increase of the mesogenic core rigidity; while the T _m, T _g and T _i decreased with increasing the spacer length. M₁ and P₁ showed no mesophase, while M₂ and M₃ all revealed a SmC* and cholesteric phases. P₂ and P₃ only showed a cholesteric phase.     

Syntheses and crystal structures of mononuclear,tetranuclear and hexanuclear organotin compounds with derivatives of p -aminobenzoic acid

Four organotin(IV) compounds, [Bu₆Sn₆O₆(L¹)₆] (1), [Bu₆Sn₆O₆(L²)₄(L³)₂] (2), [Bu₈Sn₄O₂(L²)₄] (3) and [Ph₃Sn(L²)] (4), were obtained by reactions of BuSnOH, Bu₂SnO and Ph₃SnOH with 4-((6-chloropyridin-3-yl)methylamino)benzonic acid (HL¹), 4-((pyridin-2-yl)methylamino)benzonic acid (HL²) and p-aminobenzoic acid (HL³). 1 is a hexameric cluster, existing in a drum-like structure with prismatic Sn₆O₆ core. Compound 2 is a mixed drum, containing two kinds of carboxylic acid anions. Compound 3 possesses a Sn₄O₄ ladder structure. In 2 and 3, two-dimensional supramolecular structures are formed by the intermolecular hydrogen-bonding interactions. Compound 4 is a monomer with a dimer formed through π–π stacking between adjacent L² anions. Compounds 1–4 were characterized by elemental analyses and IR spectra.     

Syntheses and structures of three disulfoxide uranyl complexes

Three disulfoxide uranyl complexes [UO₂(DBSOB)(NO₃)₂] _n (1), [UO₂(DBM)₂]₂(DBSOB) (2), and [UO₂(PMBP)₂]₂(DBSOB) (3) (DBSOB = 1,4-di(butylsulfinyl)butane, HDBM = dibenzoylmethane, HPMBP = 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone) were synthesized and characterized. The [UO₂(NO₃)₂] groups are connected by bridging disulfoxide ligands DBSOB to form a 1-D zigzag chain in 1. Two [UO₂(DBM)₂] or [UO₂(PMBP)₂] groups are connected by a bridging DBSOB to form the dimeric structures of 2 or 3, respectively. Complexes 1, 2, and 3 are the first structurally characterized disulfoxide–actinide compounds. Thermal stabilities of 1, 2, and 3 were investigated.     

A Pb2+-based coordination polymer with 5-(1H-tetrazol-5-yl)isophthalic acid ligand: structure and photoluminescence

A coordination polymer, [Pb₂(OH)(tzia)]·2H₂O (1), has been prepared by solvothermal reaction of 5-(1H-tetrazol-5-yl)isophthalic acid (H₃tzia) and Pb(NO₃)₂. The polymer 1 is based on an unprecedented centrosymmetric tetranuclear [Pb₄(OH)₂(COO)₄(ttaz)₂] cluster linked by a multidentate tzia ligand, affording a 2-D 3,6-connected kgd layer. The adjacent layers are further jointed by Pb?O interactions to form a 3-D supramolecular framework with a rare (3,8)-connected tfz-d; UO₃ topology. Photoluminescent properties of H₃tzia, 1, and 1-desolvated have been further investigated, and it was interesting to find that 1-desolvated due to the removal of lattice water molecules reveals stronger photoluminescence than 1.     

Coordination-driven synthesis of Ag(I) compounds based on a double emission ligand consisting of 1,3,4-oxadiazole and cyclotriphosphazene units

A new ligand (L) which consists of cyclotriphosphazene and 1,3,4-oxadiazole units is reported. Two new Ag(I) coordination compounds {[Ag(L)SO₃CF₃] _n (1) and Ag₂L₂(NO₃)₂ (2)} based on L and Ag(I) salts are obtained. Compound 1 features a 1-D chain, in which the ligand L adopts a divergent trans-conformation, whereas 2 is a discrete binuclear Ag(I) molecule in which L adopts convergent cis-conformation. Compounds 1 and 2 are fully characterized by ¹H-NMR, Infrared, elemental analysis, X-ray powder, and single-crystal diffraction. Luminescent properties of 1 and 2 are investigated.