Synthesis and protonation behaviour of the macrocyclic ligand 1,4,7,13-tetramethyl-1,4,7,10,13,16-hexaazacyclooctadecane and of its bicyclic derivative 4,7,10,17,23-pentamethyl-1,4,7,10,13,17,23-heptaazabicyclo[11.7.5]-pentacosane. A potentiometric and1H and13C NMR study

1992 ◽  
pp. 1059-1065 ◽  
Author(s):  
Andrea Bencini ◽  
Antonio Bianchi ◽  
Enrique Garcia-España ◽  
Vieri Fusi ◽  
Mauro Micheloni ◽  
...  
Keyword(s):  
Macrocyclic Ligand ◽  
Nmr Study

scholarly journals 19F NMR study of ligand dynamics in carboxylate-bridged diiron(ii) complexes supported by a macrocyclic ligand

2015 ◽  
Vol 44 (41) ◽  
pp. 18111-18121 ◽  
Author(s):  
Mikael A. Minier ◽  
Stephen J. Lippard
Keyword(s):  
Nmr Spectroscopy ◽  
Macrocyclic Ligand ◽  
19F Nmr ◽  
Intramolecular Dynamics ◽  
Nmr Study

Using VT 19F NMR spectroscopy, we explored the intramolecular dynamics of a family of carboxylate-bridged diiron(ii) complexes, [Fe2(X2PIM)(ArRCCO2)2]. The data are consistent with these complexes undergoing μ–η1:η2 to μ–η1:η1 carboxylate shifts.

scholarly journals Synthesis, Structure, and Magnetic Properties of Linear Trinuclear CuII and NiII Complexes of Porphyrin Analogues Embedded with Binaphthol Units

Symmetry ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 1610
Author(s):  
Jun-ichiro Setsune ◽  
Shintaro Omae ◽  
Yukinori Tsujimura ◽  
Tomoyuki Mochida ◽  
Takahiro Sakurai ◽  
...  
Keyword(s):  
Variable Temperature ◽  
Macrocyclic Ligand ◽  
Optical Purity ◽  
Antiferromagnetic Coupling ◽  
Central Metal ◽  
Nmr Study ◽  
Square Planar ◽  
Aromatic Components ◽  
Porphyrin Analogues ◽  
Paramagnetic Shifts

A porphyrin analogue embedded with (S)-1,1′-bi-2-naphthol units was synthesized without reducing optical purity of the original binaphthol unit. This new macrocyclic ligand provides the hexaanionic N4O4 coordination environment that enables a linear array of three metal ions. That is, it provides the square planar O4 donor set for the central metal site and the distorted square planar N2O2 donor set for the terminal metal sites. In fact, a CuII3 complex with a Cu(1)–Cu(2) distance of 2.910 Å, a Cu(1)–Cu(2)–Cu(1′) angle of 174.7°, and a very planar Cu2O2 diamond core was obtained. The variable-temperature 1H-NMR study of the CuII3 complex showed increasing paramagnetic shifts for the naphthyl protons as temperature increased, which suggests strong antiferromagnetic coupling of CuII ions. The temperature dependence of the magnetic susceptibility indicated antiferromagnetic coupling both for the CuII3 complex (J = −434 cm−1) and for the NiII3 complex (J = −49 cm−1). The linear (L)M(µ-OR)2M(µ-OR)2M(L) core in a rigid macrocycle cavity made of aromatic components provides robust metal complexes that undergo reversible ligation at the apical sites of the central metal.

Arylation of enelactams using TIPSOTf: reaction scope and mechanistic insight

2021 ◽  
Author(s):  
Tomasz J. Idzik ◽  
Zofia M. Myk ◽  
Łukasz Struk ◽  
Magdalena Perużyńska ◽  
Gabriela Maciejewska ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Multinuclear Nmr ◽  
Mechanistic Insight ◽  
Nmr Study ◽  
Wide Range

Triisopropylsilyltrifluoromethanesulfonate can be effectively used for the arylation of a wide range of enelactams. The multinuclear NMR study provided deep insights into the reaction mechanism.

A NMR study of human β2 microglobulin

1981 ◽  
Vol 78 ◽  
pp. 837-841 ◽  
Author(s):  
Marcel Sarrazin ◽  
Claudette Briand ◽  
Madeleine Bourdeaux ◽  
Michèle Chauvet ◽  
Claude Vincent ◽  
...  
Keyword(s):  
Β2 Microglobulin ◽  
Nmr Study
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