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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 or stacking interactions in 1 and 2 play important roles in the molecular stacking and generate a 2D structure.

Two tetrabromocuprate (II) salts with substituted benzyl pyridinium, [BzPy]2[CuBr4](1) and [4NO2BzPy]2[CuBr4](2) ([BzPy]+ = 1-benzylpyridinium; [4NO2BzPy]+ = 1-(4′-nitrobenzy- lpyridinium), were synthesized and characterized by elemental analysis, IR, MS, and single-crystal X-ray diffraction. The two salts comprise a [CuBr4]2−anion and two cations, and the [CuBr4]2−anion exhibits a distorted tetrahedral coordination geometry. The weak interactions such as p…π, π…π, C-H…π, C−H…Br or C−H…O hydrogen bonds play important roles in the stacking and stabilization of the two salts, and give rise to a 3D network structure. In addition, the two salts show good antibacterial activities for colibacillus, aurococcus, bacillus subtilus and bacillus thuringiensis.

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) A, b = 9.3988(9) A, c = 13.5875(14) A, 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.

Two new salts, [2-NaMePy]2[Ni(i-mnt)2] (1) and [2-NaMe-4-MePy]2[Ni(i-mnt)2] (2) ([2-NaMePy]+ = 1-(2′-naphthylmethyl)pyridinium, [2-NaMe-4-MePy]+ = 1-(2′-naphthylmethyl)-4-methylpyridinium and i-mnt2− = iso-maleonitriledithiolate), have been prepared and characterized by elemental analyses, UV, IR, molar conductivity, and single crystal X-ray diffraction. The anions in 1 form a 1-D chain through short C ··· N interactions between the anions, while the cations in 2 stack a 1-D column via C–H ··· π and π ··· π stacking interactions between the cations. The effect of weak intramolecular interactions such as C–H ··· N, C–H ··· S, C–H ··· Ni hydrogen bonds, and π ··· π stacking interactions between the cations and the anions further generate a 3-D network structure. The change of the molecular topology of the countercation when the 4-substituted group in the pyridine ring is changed from H atom to CH3 group results in different crystal system, space group, and the stacking mode of the cations and anions of 1 and 2.

A new ion-pair complex, bis[1-(4 ′ -nitrobenzyl)-3-cyanopyridinium]-bis(maleonitrile-dithiolate)nickelate(II)(1) ([NO 2 BzCNPy] 2 [Ni(mnt) 2 ]), was synthesized and characterized by elemental analyses, IR, MS spectra and single crystal diffraction. The crystal belongs to the triclinic system, space group P-1 with cell constants a = 9.452(1) A, b = 10.395(2) A, c = 11.117(2) A, α = 96.56(1)°, β = 113.94(1)°, γ = 112.68(1)°, Z = 1. The structure was solved by direct methods and refined to R1 = 0.0415 (wR 2 = 0.0771). The structure analysis reveals that the weak C… N, C-H… π, C-H… O, C-H… N interactions and π… π stacking interactios in the crystal play important roles in the self-assembly process and give rise to a 3D network structure.

New alkaline-earth metal cryptates [ML](ClO4)2 · solvent (M = Ca2+, Sr2+, Ba2+; L = 1,4, 12,15,18,26,31,39,42,43,44-undecaazapentacyclo-[13.13.13.16,10.120,24.133,37]-tetratetraconta-4, 6, 8, 10(44), 11,18,20,22,24(43),25,31,33,35,37(42),38-pentadecaene) were synthesized by [2 + 3] template condensation of tris(2-aminoethyl)amine with 2,6-diformylpyridine and characterized by physical methods. The crystal structure of the calcium cryptate was determined. The central atom is nine coordinate with three pyridyl and six imino nitrogen atoms. The coordination polyhedron can be described as slightly distorted tricapped trigonal prism.

A meso cobalt(II) complex, [Co(II) L2L2′] · 4.25H2O, has been synthesized from heterocyclic Schiff‐base ligand N‐ (2‐pyridyliene)‐2‐pyrimidylamine (L1) with inorganic cobalt(II) Salt, and its coordination of chemistry has also been investigated. Carmine block crystals of [Co(II) L2 L2′] · 4.25H2O were obtained from the filtrate which was resulted from the addition of a hot alcohol solution of N‐ (2‐pyridyliene)‐2‐pyrimidylamine (L1) into the alcohol solution of the CoCl2 · 6H2O. Single‐crystal X‐ray diffraction analysis indicates that it crystallizes in a trigonal system with space group R‐3c, with a=24.820(4), b=24.820(4), c=21.010(4) A, α=90°, β=90°, γ=120°, V=11209(3) A3, Z=36, Mr=533.413, F(000)=5060, Dc=1.439 g/cm3, μ(MoKα)=0.742 mm−1, R=0.0666, and wR2=0.2734 for 2229 reflections with I>2σ (I). The Co atom is coordinated in a elongated octahedral geometry by two O atoms, which produced by partial hydrolysis of N‐ (2‐pyridyliene)‐2‐pyrimidylamine (L1), and four N atoms, among which two N atoms were f...

A new neodymium cryptate [NdL](NO)3·H2O (L = 1,4,12,15,18,26,31,39,42,43,44-undecaazapentacyclo-[13.13.13.16,10.120,24.133,37]-tetratetraconta-4,6,8,10(44)11,18,20,22,24(43),25,31,33,35,37(42),38-pentadecaene) was synthesized by the reaction of free ligand L with neodymium nitrate and characterized by physical methods and X-ray crystallography. It crystallizes in space group with a = 14.623(2), c = 32.682(3) A, Z = 6. Final refinement of the structure gave R = 0.042 and Rw = 0.132 . The crystal structure of Nd(III) cryptate shows a tricapped prismatic structure with coordination number nine.