Crystal structures of the pseudo-one-dimensional magnetic systems, pyridinium manganese (II) chloride monohydrate and quinolinium manganese (II) chloride monohydrate, and the magnetic behavior of the quinolinium salt

Abstract

The crystal structures of pyridinium manganese(II) chloride monohydrate (PMC) and quinolinium manganese(II) chloride monohydrate (QMC) both contain bi-bridged linear chains. These chains are hydrogen bonded together to form a two-dimensional network. The magnetic susceptibility of QMC is characteristic of a weak antiferromagnet with a maximum in the susceptibility at 2.0 °K. Analysis of the data in terms of a 1-d Heisenberg linear chain gives an intrachain exchange constant of J/k=−0.36 °K. However, the best model includes significant interchain interactions. Thus, both the structural features and magnetic susceptibility indicate that QMC is a perturbed one-diminsional system. This conclusion is supported by previously reported magnetic susceptibility and ESR data for PMC.

Tunable Dielectric Responses Triggered by Dimensionality Modification in Organic–Inorganic Hybrid Phase Transition Compounds (C5H6N)CdnCl2n+1 (n = 1 and 2)

“…Each Cd atom is surrounded by 6 Cl atoms, forming a distorted octahedron with Cd–Cl distances ranging from 2.582(4) to 2.673(5) Å and adjacent Cl-atom angles Cl–Cd–Cl varying from 87.07(2)° to 172.67(5)° (Table S3, Supporting Information). The inorganic frameworks are analogous to (C 5 H 5 NH)­(MnCl 3 )­H 2 O (Mn–Cl distances, 2.583(2)–2.674(2) Å; Cl–Mn–Cl angles, 87.15(5)–173.49(5)°) . Corner-sharing Cd octahedrons are linked together by Cl atoms to build up a two-dimensional layered network (Figure S9, Supporting Information).…”

“…ε′ values at 1 M Hz along the a and c axes are obviously larger than that along the b axis. Such a strong dielectric anisotropy can be responsible for the intrinsic structural changes in the phase transition processes. − As structure analysis shows in Figure , the Py cation lies in the ac plane perpendicular to the b axis. Thus, the orientational motions of the Py cations arouse motions along the a and c axes, which yield more dipole-moment components, leading to visible dielectric anomalies in these two axes.…”

Probing the Coordination Chemistry of N-2-Pyridylimidoyl-2-pyridylamidine: A Versatile Ligand with Multiple Coordination Sites

“…Such studies are currently underway. 18,20 and dipyridinium tetrachlorocobaltate (II) ([PyH] 2 •[CoCl 4 ]) was synthesized according to a procedure described in the Supporting Information. Purification, chemical characterization, and unit cell parameters of these salts are also included in the Supporting Information.…”

Rational Design of Tetranuclear Complexes Employing N‐Imidoylamidine Based Ligands

“…Following a similar procedure, coordination to the tridentate pocket of the pyrimidyl analogue Pm 2 ImAm can also be achieved. Here, a methanolic (MeOH) solution of pyridinium trichloromanganate(II) monohydrate ( [PyH][Mn II Cl 3 ]·H 2 O ), was combined with a solution of Pm 2 ImAm in acetonitrile (MeCN; Scheme ). After leaving the resulting solution to stand overnight, crystals suitable for X‐ray analysis were obtained confirming the identity of [Mn II 2 ( µ ‐Cl) 2 (Pm 2 ImAm) 2 Cl 2 ] .…”

“…General Procedures: All solvents and reagents were reagent grade and used without further purification. Pyridinium tetrachloroferrate(III) ( [PyH][FeCl 4 ] ), pyridinium trichloromanganate(II) monohydrate ( [PyH][MnCl 3 ]·H 2 O ) and N ‐2‐pyrimidylimidoyl‐2‐pyrimidylamidine ( Pm 2 ImAm ) were synthesized according to literature procedures , , . IR spectra were recorded on an Agilent Technologies Cary 630 FT‐IR spectrometer.…”