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Two new salts based on [Ni(tdas)] (tdas = 1,2,5-thiadiazole-3,4-dithiolate) anion, [Bz4EtPy][Ni(tdas)] ( 1) and [4ClBz4EtPy][Ni(tdas)] ( 2), have been prepared by reaction of Natdas, NiCl·6HO, and [Bz4EtPy]Br ([Bz4EtPy] = 1-benzyl-4-ethylpyridinium) or [4ClBz4EtPy]Br ([4ClBz4EtPy] = 1-(4′-chlorobenzyl)-4-ethylpyridinium), and characterized by elemental analyses, UV, IR, MS spectrum, molar conductivity and single crystal X-ray diffraction. Single-crystal X-ray diffraction analyses indicate that the two salts crystallize in a triclinic system with space group P−1. The unit cell contains two [Bz4EtPy]/[4ClBz4EtPy] and one [Ni(tdas)] anion in which the anion exhibits a quasi-planar structure. The crystals of 1 and 2 are stabilized through C-H···S and C-H···Ni hydrogen bonds, π···π stacking interactions and S···Cl short interactions. Graphical Abstract: In two new salts based on [Ni(tdas)] (tdas = 1,2,5-thiadiazole-3,4-dithiolate) anion, [Bz4EtPy][Ni(tdas)] ( 1) and [4ClBz4EtPy][Ni(tdas)] ( 2), the unit cell contains two cations and one [Ni(tdas)] anion, and C-H···S and C-H···Ni hydrogen bonds, π···π stacking interactions and S···Cl short interactions are founded.[Figure not available: see fulltext.] [ABSTRACT FROM AUTHOR]

Two tetrabromocuprate(II) salts with benzyl substituted pyridinium, [Bz-4-NH2Py]2[CuBr4] (1) and [Bz-4-N(CH3)2Py]2- [CuBr4] (2) ([Bz-4-NH2Py]+ = (1-benzyl-4′-aminopyridinium), [Bz-4-N(CH3)2Py]+ = 1-benzyl-4′-dimethylaminopyridinium) were crystallized from methanol and diluted in HBr solution. Compound 1 crystallizes in the orthorhombic Pna21, with 2 in the monoclinic P21/n. Two salts are composed of one tetrahedral [CuBr4]2− anion and two tortuous [Bz-4-NH2Py]+/[Bz-4-N(CH3)2Py]+ cations. The [CuBr4]2− anions in 1 form a linear chain, while the combination of C-H···π, C-H···Br, C-H···N weak hydrogen bonds and π···π interactions results in the forming of a 3D network structure of 1 and 2. The two salts show good antibacterial activities for E. coli and S. aureus. [ABSTRACT FROM AUTHOR]

Two new salts, [1-NaMe-2-NH2Py]2[Ni(mnt)2] (1) and [1-NaMe-2-NH2Py]2[Ni(i-mnt)2] (2) ([1-NaMe-2-NH2Py]+ = 1-(1'-naphthylmethyl)-2-aminopyridinium, mnt2- = maleonitriledithiolate, and i-mnt2- = iso-maleonitriledithiolate), have been obtained and characterized by elemental analyses, infrared (IR), ultraviolet (UV), mass spectroscopy (MS), molar conductivities, and single-crystal x-ray diffraction. The results have shown that the change of the ligand from mnt to i-mnt results in differences in the crystal system, space group, weak interactions, and the stacking mode of the cations and anions. The effects of weak interactions such as C--H···N, N-H···N, or C--H···Ni hydrogen bonds and p···π, π···π, and C--H···π stacking interactions generate a three-dimensional (3D) network structure. [ABSTRACT FROM AUTHOR]

A new salt, [EtdiPy][Ni(i-mnt)2](1) (i-mnt = iso-maleonitriledithiolate, [EtdiPy]2+= 1,1'-ethylene-2,2'-dipyridinium) has been synthesized and characterized by elemental analysis, IR, UV-Vis, EI-MS spectra, and single crystal X-ray diffraction. It is interesting that the [Ni(i-mnt)2]2- anions containing Ni(1) atom form a 1D chain by the π···π stacking interactions between the CN groups, while the anions containing Ni(2) atom form a ring structure through the S···N short interactions. The weak p···π and π···π stacking interactions, as well as C-H···N and C-H···S hydrogen bonds between the anions and the cations observed in the crystal, give further rise to a complicated network structure. [ABSTRACT FROM AUTHOR]

Two new salts, [NO2BrBzPy]2[M(mnt)2] ([NO2BrBzPy]+= 1-(2'-bromo-4'-nitrobenzyl)pyridinium; mnt2-= maleonitriledithiolate; M = Ni(1), Pd(2)) have been prepared and characterized by elemental analyses, IR, UV, ESI-MS spectra, TG, and single-crystal X-ray diffraction. The results reveal that when the metal ion is changed from Ni(II) to Pd(II), the crystal system, and the dihedral angles between the phenyl and pyridine rings and the C-C-N reference plane of the cation, and the stacking modes of the anions and the cations are evidently different. Some weak interactions such as C-H···Br, C-H···O, C-H···N and C-H···S hydrogen bonds, p[image omitted] or [image omitted] stacking interactions in 1 and 2 play important roles in the molecular stacking and generate a 2D structure. [ABSTRACT FROM AUTHOR]

An ionic pair complex, [FClBzDMAP]2[Pd(mnt)2] (1) , ([FClBzDMAP]+ = [1-(4'-fluoro-2'-chlorobenzyl)-4-dimetylamino pyridinium, mnt2- = maleonitriledithiolate), was synthesized and characterized by elemental analyses, IR, UV-vis spectra, molar conductivities and single crystal diffraction. The crystal belongs to the triclinic system, space group P-1 with cell constants a = 8.3472(8) Å, b = 9.3988(9) Å, c = 13.5875(14) Å, α = 76.676(1)°, β = 86.036(1)°, γ = 71.182(1)°, Z = 1. It is interesting that the [FClBzDMAP]+ cations (C) and the [Pd(mnt)2]2- anions (A) in 1 stack into a 1D alternating CC-A-CC-A-CC column along ab direction, while the cations form a 1D column along bc direction. Some weak interactions such as p ... π, π ... π, Cl ... S, and C─ H ... N interactions in the crystal play important roles in the self-assembly process and give rise to a 3D network structure. [ABSTRACT FROM AUTHOR]

A new ion-pair complex, [BzTPP]2[Ni(i-mnt)2](1) (i-mnt2- = iso-maleonitriledithiolate, [BzTPP]+ = benzyltriphenylphosphinium) was synthesized and characterized by elemental analysis, IR, UV, EI-MS spectra and single crystal X-ray diffraction. The single-crystal structural analysis shows that 1 crystallizes in the triclinic space group P-1, with a = 9.466(1) Å, b = 10.196(1)Å, c = 29.252(3)Å, α = 99.28(1)ˆ, β = 93.96(1)ˆ, γ = 106.34(1)ˆ, V = 2654.3(4)Å3, Z = 2. The Ni(II) ions of the [Ni(i-mnt)2]2 - anion adopted a square-planar coordination geometry. Four weak C─H...N hydrogen bonds between the anions and the cations observed in the crystal give further rise to a 3D structure. [ABSTRACT FROM AUTHOR]

Abstract: Two new molecular magnets, [BzPyN(CH3)2][Ni(mnt)2] (1) and [NO2BzPyN(CH3)2][Ni(mnt)2] (2)([BzPyN(CH3)2]+ =1-benzyl-4-dimethylaminopyridinium, [NO2BzPyN(CH3)2]+ =1-(4′-nitrobenzyl)-4-dimethylaminopyridinium, and mnt2− =maleonitriledithiolate) have been prepared and characterized by elemental analyses, IR, MS spectra, single crystal X-ray diffraction and magnetic susceptibility. The Ni(III) ions of both 1 and 2 form a 1D zigzag alternating magnetic chain within a column through Ni⋯S, Ni⋯Ni, Ni⋯N, S⋯S, or π⋯π interactions. Magnetic susceptibility measurements in the temperature range 1.8–300K show that 1 exhibits antiferromagnetic behavior, while 2 shows a spin gap transition around 170K, and antiferromagnetic interaction in the high-temperature phase (HT) and spin gap in the low-temperature phase (LT). The phase transition for 2 is second-order by determination of DSC analyses. [Copyright &y& Elsevier]