Nickel(II) Coordination Clusters Based on N-salicylidene-4-chloro-oaminophenol: Synthetic and Structural Studies

The first member of a second generation family of ligands derived from metal-ion assisted reactivity of di-2,6-(2-pyridylcarbonyl)pyridine: Synthesis and characterization of a MnII/III4 rhombus

Abstract Nucleophilic attack by the carbanion −CH2COCH3 at the carbonyl carbon atoms of 2,6-di-(2-pyridylcarbonyl)pyridine, pyCOpyCOpy, in the presence of Mnn+ ions under basic conditions has yielded the cationic cluster [Mn4(OH)2(L)2(H2O)2](ClO4)4 (1), where L2− is the (py)C(CH2COCH3)(O−)(py)C(CH2COCH3)(O−)(py) dianion. The cluster cation possesses a planar {MnII2MnIII2(μ3-OH)2(μ-OR)4}4+ rhombus core, resulting from two μ3-OH− ions and two η1:η2:η1:η1:η1:η2:η1:μ3 bridging L2− groups from the in situ formed ligand. Complex 1 is antiferromagnetically coupled with an unusual S = 2 ground state resulting from spin frustration effects within the triangular Mn3 subunits of the cluster.

Further synthetic investigation of the general lanthanoid(iii) [Ln(iii)]/copper(ii)/pyridine-2,6-dimethanol/carboxylate reaction system: {CuII5LnIII4} coordination clusters (Ln = Dy, Tb, Ho) and their yttrium(iii) analogue

In addition to previously studied {CuII3Gd6}, {CuII8Gd4}, {CuII15Ln7} and {CuII4Ln8} coordination clusters (Ln = trivalent lanthanide) containing pdm2− or Hpdm− ligands (H2pdm = pyridine-2,6-dimethanol) and ancillary carboxylate groups (RCO2−), the present work reports the synthesis and study of three new members of a fifth family of such complexes. Compounds [Cu5Ln4O2(OMe)4(NO3)4(O2CCH2But)2(pdm)4(MeOH)2] (Ln = Dy, 1; Ln = Tb, 2; Ln = Ho, 3) were prepared from the reaction of Ln(NO3)3·xH2O (x = 5, 6), CuX2·yH2O (X = ClO4, Cl, NO3; y = 6, 2 and 3, respectively), H2pdm, ButCH2CO2H and Et3N (2 : 2.5 : 2 : 1 : 9) in MeCN/MeOH. Rather surprisingly, the copper(II)/yttrium(III) analogue has a sli…

A Nonanuclear Iron(II) Single-Molecule Magnet

A family of enneanuclear iron(II) single-molecule magnets.

Complexes [Fe 9 (X) 2 -(02CMe)8{(2-py) 2 CO 2 } 4 ] (X - = OH (1), N 3 - (2), and NCO- (3)) have been prepared by a route previously employed for the synthesis of analogous Co 9 and Ni 9 complexes, involving hydroxide substitution by pseudohalides (N 3 - , NCO-). As indicated by DC magnetic susceptibility measurements, this substitution induced higher ferromagnetic couplings in complexes 2 and 3, leading to higher ground spin states compared to that of 1. Variable-field experiments have shown that the ground state is not well isolated from excited states, as a result of which it cannot be unambiguously determined. AC susceptometry has revealed out-of-phase signals, which suggests that these…

Hexanuclear Manganese(III) Single-Molecule Magnets

CCDC 1538406: Experimental Crystal Structure Determination

Related Article: Ioannis Mylonas-Margaritis, Julia Mayans, Panagiota S. Perlepe, Catherine P. Raptopoulou, Vassilis Psycharis, Konstantina I. Alexopoulou, Albert Escuer, Spyros P. Perlepes|2017|Curr.Inorg.Chem.|7|48|doi:10.2174/1877944107666170705105817

CCDC 1538408: Experimental Crystal Structure Determination

Related Article: Ioannis Mylonas-Margaritis, Julia Mayans, Panagiota S. Perlepe, Catherine P. Raptopoulou, Vassilis Psycharis, Konstantina I. Alexopoulou, Albert Escuer, Spyros P. Perlepes|2017|Curr.Inorg.Chem.|7|48|doi:10.2174/1877944107666170705105817

CCDC 1538411: Experimental Crystal Structure Determination

Related Article: Ioannis Mylonas-Margaritis, Julia Mayans, Panagiota S. Perlepe, Catherine P. Raptopoulou, Vassilis Psycharis, Konstantina I. Alexopoulou, Albert Escuer, Spyros P. Perlepes|2017|Curr.Inorg.Chem.|7|48|doi:10.2174/1877944107666170705105817

CCDC 2038607: Experimental Crystal Structure Determination

Related Article: Despina Dermitzaki, Catherine P. Raptopoulou, Vassilis Psycharis, Albert Escuer, Spyros P. Perlepes, Julia Mayans, Theocharis C. Stamatatos|2021|Dalton Trans.|50|240|doi:10.1039/D0DT03582C

CCDC 1538407: Experimental Crystal Structure Determination

Related Article: Ioannis Mylonas-Margaritis, Julia Mayans, Panagiota S. Perlepe, Catherine P. Raptopoulou, Vassilis Psycharis, Konstantina I. Alexopoulou, Albert Escuer, Spyros P. Perlepes|2017|Curr.Inorg.Chem.|7|48|doi:10.2174/1877944107666170705105817

CCDC 1538409: Experimental Crystal Structure Determination

Related Article: Ioannis Mylonas-Margaritis, Julia Mayans, Panagiota S. Perlepe, Catherine P. Raptopoulou, Vassilis Psycharis, Konstantina I. Alexopoulou, Albert Escuer, Spyros P. Perlepes|2017|Curr.Inorg.Chem.|7|48|doi:10.2174/1877944107666170705105817

CCDC 1538410: Experimental Crystal Structure Determination

Related Article: Ioannis Mylonas-Margaritis, Julia Mayans, Panagiota S. Perlepe, Catherine P. Raptopoulou, Vassilis Psycharis, Konstantina I. Alexopoulou, Albert Escuer, Spyros P. Perlepes|2017|Curr.Inorg.Chem.|7|48|doi:10.2174/1877944107666170705105817

CCDC 2038608: Experimental Crystal Structure Determination

Related Article: Despina Dermitzaki, Catherine P. Raptopoulou, Vassilis Psycharis, Albert Escuer, Spyros P. Perlepes, Julia Mayans, Theocharis C. Stamatatos|2021|Dalton Trans.|50|240|doi:10.1039/D0DT03582C