Syntheses, weak interactions, and 3-D network structures of two salts based on [Ni(i-mnt)₂]²⁻ (i-mnt²⁻=iso-maleonitriled-ithiolate) anion with substituted pyridinium cation

Abstract

Two new salts, [2-NaMePy] 2 [Ni(i-mnt) 2 ] (1) and [2-NaMe-4-MePy] 2 [Ni(i-mnt) 2 ] (2) ([2-NaMePy] þ ¼ 1-(2 0 -naphthylmethyl)pyridinium, [2-NaMe-4-MePy] þ ¼ 1-(2 0 -naphthylmethyl)-4-methylpyridinium and i-mnt 2À ¼ 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 Á Á Á N interactions between the anions, while the cations in 2 stack a 1-D column via C-H Á Á Á and Á Á Á stacking interactions between the cations. The effect of weak intramolecular interactions such as C-H Á Á Á N, C-H Á Á Á S, C-H Á Á Á Ni hydrogen bonds, and Á Á Á 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 CH 3 group results in different crystal system, space group, and the stacking mode of the cations and anions of 1 and 2.

Two New Salts Based on Bis(1,2,5-thiadiazole-3,4-dithiolate)nickelate Anion with Substituted Benzyl 4-ethylpyridinium: Syntheses, Crystal Structures and Properties

“…The average Ni-S bond distance is 2.195(1) Å , and the S-Ni-S bond angle within the five-membered ring is 93.55°, as those have been observed for other [Ni(tdas) 2 ] 2-structures [20,21]. Selected bond lengths and bond angles are listed in Table 2 [33,34] with a C(14)ÁÁÁNi(1) distance of 3.324(1) Å . It is noted that the C-HÁÁÁNi interaction is uncommon, resembling a reported C-HÁÁÁCu interaction [35].…”

Complicated weak interactions in a hybrid material containing tetra(isothiocyanate)cobalt(II) and 1,1′-ethylene-2,2′-dipyridinium: synthesis, crystal structure, and magnetic properties

“…These short interactions are similar to short SÁ Á ÁS [25][26][27] or CÁ Á ÁN Table 2. Selected bond lengths (Å ) and angles ( ) for 1. interactions [28][29][30]. Two weak interactions were observed between cations and anions (figure 3): (1) the pÁ Á Á stacking interaction [31,32] between S(8) of NCS and the pyridine ring containing N(12) with a perpendicular distance of 3.500 Å ; (2) the Á Á Á stacking interaction between C N of NCS and the pyridine ring containing C(24) with C(6)Á Á ÁC(24 iv ) distance of 3.292 Å .…”

Two New Ion-Pair Complexes Based on Bis(iso-maleonitriledithiolate)nickelate(II) Anion and Substituted Pyridinium/Quinolinium: Syntheses, Weak Interactions, and 3D Structures

“…The characteristic bands at 456, 238, and 227nm for 1 and 455, 243, and 224nm for 2 are assigned as M→L, L(σ )→L, and L(π )→M, which are similar to those of other complexes containing [Ni(i-mnt) 2 ] 2-anion. [25,31] [25,26] The relevant bond lengths and angles are listed in Table 2. The most obvious structure feature of 1 is that the [Ni(i-mnt) 2 ] 2-anions form a 1D chain through C···C and C···N short interactions [25] between the i-mnt ligands with C(2)···N(2 ii ) and C(4)···C(4 ii ) (symmetry code: ii = -x + 3/2, -y + 1/2, -z + 1) distances of 3.381 Å and 3.381 Å, as shown in Figure 2a ( Figure 2b): (1) the C-H···N hydrogen bond [25] between the N(2) of the anion and the H(11) atom on the C(11) atom of the adjacent cation; (2) the C-H···Ni hydrogen bond between the Ni(1) of the anion and the H(16) atom on the C(16) atom of the adjacent cation, and the bond parameters are listed in Table 3.…”

“…[23,24] In our earlier works, we have synthesized and characterized several coordination complexes containing [Ni(imnt) 2 ] 2-anion and some courtercations. [25,26] (2)) were obtained and characterized by elemental analysis, IR, UV-visible spectra, ESI-MS spectra, TGA, and single-crystal X-ray diffraction.…”