Two new transition metal thiocyanate coordination polymers with the composition [Co(NCS)2(4-vinylpyridine)2]n (1) and [Co(NCS)2(4-benzoylpyridine)2]n (2) were synthesized their crystal structures determined. In both compounds Co cations are octahedrally coordinated by two trans-coordinating 4-vinyl- or 4-benzoylpyridine co-ligands four μ-1,3-bridging thiocyanato anions linked into chains anionic ligands. While in 1 N S atoms of also trans-configuration, 2 they cis-configuration. A detailed...

Two new ferromagnetic layered Co(<sc>ii</sc>) and Ni(<sc>ii</sc>) thiocyanate coordination polymers were synthesized, structurally characterized investigated for their magnetic behavior using susceptibility measurements theoretical methods.

Abstract The cobalt(II) in [Co(NCS) 2 (4‐methoxypyridine) ] n are linked by pairs of thiocyanate anions into linear chains. In contrast to a previous structure determination, two crystallographically independent centers have been found be present. the antiferromagnetic state, below critical temperature ( T c =3.94 K) and field H =290 Oe), slow relaxations ferromagnetic chains observed. They originate mainly from defects magnetic structure, which has elucidated micromagnetic Monte Carlo...

[Co(NCS)2(py)2]n (py = pyridine) is composed of ferromagnetic chains Co(ii) cations connected by double NCS bridges. The are irregular because two crystallographically inequivalent cations. coordination polyhedron the a distorted octahedron built from N and S atoms four equatorial anions apical pyridine ligands. Magnetic specific heat studies show that compound undergoes phase transition at 3.7 K to state. determined magnetic interactions, intrachain (J/kB 28 K) interchain (zJ'/kB 0.5 K),...

Two different isomers of [Co(NCS)2(4-chloropyridine)2]n (3C and 3L) were synthesized from solution by thermal decomposition Co(NCS)2(4-chloropyridine)2(H2O)2 (2), which show a metal coordination leading to corrugated chains in 3C linear 3L. Solvent mediated conversion experiments prove that is thermodynamically stable at room temperature where 3L metastable. Magnetic measurements reveal the magnetic exchange comparable observed for previously reported related chain compounds, whereas with...

The synthesis of ethoxido-bridged dinuclear oxidovanadium(IV) complexes the general formula (HNEt3)[(VOL1–3)2(μ-OEt)] (1–3) with azo dyes 2-(2′-carboxy-5′-X-phenylazo)-4-methylphenol (H2L1, X = H; H2L2, NO2) and 2-(2′-carboxy-5′-Br-phenylazo)-2-naphthol (H2L3) as ligands is reported. differ in substituents at phenyl ring to probe their influence on redox behavior, biological activity, magnetochemistry complexes, for which results are presented discussed. All synthesized vanadium(IV) have...

The trinuclear copper(ii) complex [Cu3(saltag)(py)6]ClO4 (H5saltag = tris(2-hydroxybenzylidene)triaminoguanidine) was synthesized and characterized by experimental as well theoretical methods. This exhibits a strong antiferromagnetic coupling (J -298 cm-1) between the ions, mediated N-N diazine bridges of tritopic ligand, leading to spin-frustrated system. compound shows T2 coherence time 340 ns in frozen pyridine solution, which extends 591 changing solvent pyridine-d5. Hence, presented is...

The synthesis, structure, and magnetic properties of two mononuclear cobalt(ii) complexes [Co(LSal,2-Ph)2] (1) [Co(LNph,2-Ph)2] (2) are reported. utilized sterically demanding Schiff-base ligands HLSal,2-Ph (2-(([1,1'-biphenyl]-2-ylimino)methyl)phenol) HLNph,2-Ph (1-(([1,1'-biphenyl]-2-ylimino)methyl)naphthalen-2-ol) lead to a strong distortion the [N2O2] coordination environment in 1 2, which can be primarily attributed variation dihedral angle between planes chelate ligands. Magnetic...

Abstract Two novel dioxidomolybdenum(VI) complexes [MoO 2 L′ 1 ] ( ) and containing the MoO 2+ motif with unexpected coordination motifs due to ligand rearrangement through Mo‐mediated interligand C–C bond formation are reported. The ligands (H 1–2 tetradentate C–C‐coupled O N ‐donor systems formed in situ during synthesis of by reaction [Mo VI (acac) Schiff base 2‐aminophenol 2‐pyridinecarbaldehyde (HL 2‐quinolinecarbaldehyde ). To confirm that is assisted molybdenum, corresponding vanadium...

A cobalt(II)-based spin triangle shows a significant spin-electric coupling. [Co

The new tritopic triaminoguanidine-based ligand 1,2,3-tris[(pyridine-2-ylmethylidene)amino]guanidine (H2pytag) was synthesized. reaction of a mixture cobalt(II) chloride and perchlorate with the H2pytag in pyridine solution leads to formation trinuclear complex [Co3(pytag)(py)6Cl3]ClO4. Three octahedrally coordinated high-spin ions are linked through bridging triaminoguanidine backbone leading an almost equilateral triangular arrangement. magnetic properties were investigated by...

Properties of 1D periodic magnetic chains can be described on the basis results from<italic>ab initio</italic>multi-reference calculations performed for individual spin centers, which provides a investigations their dynamic properties.

Reaction of Co(NCS)2 with different coligands leads to the formation three compounds general composition [Co(NCS)2(L)2]n (L = aniline (1), morpholine (2), and ethylenethiourea (3)). In all these cobalt(II) cations are octahedrally coordinated by two trans thiocyanate N S atoms apical donor linked into linear chains pairs anionic ligands. The magnetic behavior was investigated a combination static dynamic susceptibility as well specific-heat measurements, computational studies, THz-EPR...

New cobalt(II)-based complexes with [N

Abstract The methanol solvomorph 1 ⋅ 2MeOH of the cobalt(II) complex [Co(L Sal,2−Ph ) 2 ] ( with sterically demanding Schiff‐base ligand 2‐(([1,1′‐biphenyl]‐2‐ylimino)methyl)phenol (HL shows thus far largest dihedral twist distortion between two chelate planes compared to an ideal pseudotetrahedral arrangement. ion in exhibits easy‐axis anisotropy leading a spin‐reversal barrier 55.3 cm −1 , which corresponds increase about 17 % induced by larger solvent‐free . magnetic relaxation for is...

Single crystal studies reveal separate magnetic relaxation processes. The analysis is supported by results for the diluted compound, <italic>ab initio</italic> calculations, and micromagnetic simulations.

The reaction of Co(NCS)2 with 3-bromopyridine leads to the formation discrete complexes [Co(NCS)2(3-bromopyridine)4] (1), [Co(NCS)2(3-bromopyridine)2(H2O)2] (2), and [Co(NCS)2(3-bromopyridine)2(MeOH)2] (3) depending on solvent. Thermogravimetric measurements 2 3 show a transformation into [Co(NCS)2(3-bromopyridine)2]n (4), which upon further heating is converted [{Co(NCS)2}2(3-bromopyridine)3]n (5), whereas 1 transforms directly 5 heating. Compound can also be obtained from solution, not...

The trinuclear high-spin iron(III) complex [Fe3Cl3(saltagBr)(py)6]ClO4 {H5saltagBr = 1,2,3-tris[(5-bromo-salicylidene)amino]guanidine} was synthesized and characterized by several experimental theoretical methods. exhibits molecular 3-fold symmetry imposed the rigid ligand backbone crystallizes in trigonal space group P3̅ with cation lying on a crystallographic C3 axis. states (S 5/2) of individual ions were determined Mößbauer spectroscopy confirmed CASSCF/CASPT2 ab initio calculations....

Reaction of Co(NCS)2 with 4-bromopyridine leads to the formation discrete complexes composition Co(NCS)2(4-bromopyridine)4·(CH3CN)0.67 (1), Co(NCS)2(4-bromopyridine)2(H2O)2 (2), Co(NCS)2(4-bromopyridine)2(CH3OH)2 (3) and Co(NCS)2(4-bromopyridine)2(CH3CN)2 (4). Upon heating compounds 2 4 transform into a crystalline product Co(NCS)2(4-bromopyridine)2 (5-I) that also can easily be obtained from solution. In this compound, Co cations are linked by single μ-1,3-bridging thiocyanate anions...

Five new lanthanide(III) sandwich and half‐sandwich complexes with bulky cyclooctatetraenyl ligands have been prepared fully characterized, including single‐crystal X‐ray structure determination. The treatment of anhydrous chlorides, LnCl 3 (Ln = Pr, Tb, Yb), 2 equivalents Li COT′′ [COT′′ 1,4‐bis(trimethylsilyl)cyclooctatetraene dianion] followed by crystallization in the presence a coordinating solvent afforded anionic [Li(THF) 4 ][Pr(COT′′) ] ( 1 ), [Li(DME) ][Tb(COT′′) ; DME...

The reaction of Co(NCS)2 with N-methylaniline leads to the formation [Co(NCS)2(N-methylaniline)2]n (1), in which cobalt(II) cations are octahedrally coordinated and linked into linear chains by pairs thiocyanate anions. In contrast [Co(NCS)2(aniline)2]n (2) reported recently, strong interchain N-H···S hydrogen bonding, such interactions absent 1. Computational studies reveal that ions compound 1 show an easy-axis anisotropy is lower than 2, but direction easy axis being similar both...

Two new mononuclear cobalt(II) complexes with the general formula [Co(L1,2)2] (1 and 2) were synthesized using bidentate Schiff base ligands NO donor set, namely, 2-(benzothiazole-2-ylimino)methyl-5-(diethylamino)phenol (HL1) its methyl substituted derivative 2-(6-methylbenzothiazole-2-ylimino)methyl-5-(diethylamino)phenol (HL2). X-ray structure analysis reveals a distorted pseudotetrahedral coordination sphere at ion, that cannot be described by simple twisting of two ligand chelate planes...

The trinuclear nickel(II) complex [Ni 3 (saltag t Bu )(bpy) (H 2 O) ]Cl 5 saltag = 1,2,3‐tris[(5‐ tert ‐butylsalicylidene)amino]guanidine) was synthesized and characterized by experimental as well theoretical methods. salt crystallizes with three molecules of dimethylformamide (dmf) water · 3dmf 3H O ( 1 ) in the trigonal space group P , located on a threefold rotation axis, which is consistent molecular C symmetry cation. Magnetic measurements reveal an antiferromagnetic coupling J –35.9 cm...

The sugar-modified Schiff-base ligands derived from benzyl 2-deoxy-2-salicylideneamino-α-D-glucopyranoside (H2L5-Br and H2L3-OMe) were used to prepare the chiral oxidovanadium(V) complexes [VO(L5-Br)(OMe)] (1) [VO(L3-OMe)(OMe)] (2) which can be isolated a methanol solution as six-coordinate with an additional ligand [VO(L5-Br)(OMe)(MeOH)] (1–MeOH) [VO(L3-OMe)(OMe) (MeOH)] (2–MeOH). Both crystallize in orthorhombic space group P212121 together two solvent molecules of 1–MeOH·2MeOH...