Square-Planar Iridium(II) and Iridium(III) Amido Complexes Stabilized by a PNP Pincer Ligand

2011 ◽  
Vol 50 (35) ◽  
pp. 8184-8187 ◽  
Author(s):  
Jenni Meiners ◽  
Markus G. Scheibel ◽  
Marie-Hélène Lemée-Cailleau ◽  
Sax A. Mason ◽  
M. Bele Boeddinghaus ◽  
...  
Keyword(s):  
Pincer Ligand ◽  
Amido Complexes ◽  
Square Planar

scholarly journals Synthesis, Structure and In Vitro Anticancer Activity of Pd(II) Complex of Pyrazolyl-s-Triazine Ligand; A New Example of Metal-Mediated Hydrolysis of s-Triazine Pincer Ligand

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 119
Author(s):  
Jamal Lasri ◽  
Matti Haukka ◽  
Hessa H. Al-Rasheed ◽  
Nael Abutaha ◽  
Ayman El-Faham ◽  
...  
Keyword(s):  
Thermal Conditions ◽  
Molar Ratio ◽  
Chloride Salt ◽  
Pincer Ligand ◽  
Hydrogen Bonding Interactions ◽  
Square Planar ◽  
Hirshfeld Analysis ◽  
Hydrolysis Of ◽  
Mcf 7

The square planar complex [Pd(PT)Cl(H2O)]*H2O (HPT: 6-(3,5-dimethyl-1H-pyrazol-1-yl)-1,3,5-triazine-2,4(1H,3H)-dione) was obtained by the reaction of 2-methoxy-4,6-bis(3,5-dimethyl-1H-pyrazol-1-yl)-1,3,5-triazine (MBPT) pincer ligand with PdCl2 in a molar ratio (1:1) under thermal conditions and using acetone as a solvent. The reaction proceeded via C-N cleavage of one C-N moiety that connects the pyrazole and s-triazine combined with the hydrolysis of the O-CH3 group. The reaction of the chloride salt of its higher congener (PtCl2) gave [Pt(3,5-dimethyl-1H-pyrazole)2Cl2]. The crystal structure of [Pd(PT)Cl(H2O)]*H2O complex is stabilized by inter- and intra-molecular hydrogen bonding interactions. Hirshfeld analysis revealed that the H...H (34.6%), O...H (23.6%), and Cl...H (7.8%) interactions are the major contacts in the crystal. The charges at Pd, H2O, Cl and PT are changed to 0.4995, 0.2216, −0.4294 and −0.2917 instead of +2, 0, −1 and −1, respectively, using the MPW1PW91 method. [Pd(PT)Cl(H2O)]*H2O complex has almost equal activities against MDA-MB-231 and MCF-7 cell lines with IC50 of 38.3 µg/mL.

Inside Cover: Square-Planar Ruthenium(II) Complexes: Control of Spin State by Pincer Ligand Functionalization (Chem. Eur. J. 2/2015)

2015 ◽  
Vol 21 (2) ◽  
pp. 474-474
Author(s):  
Bjorn Askevold ◽  
Marat M. Khusniyarov ◽  
Wolfgang Kroener ◽  
Klaus Gieb ◽  
Paul Müller ◽  
...  
Keyword(s):  
Spin State ◽  
Pincer Ligand ◽  
Square Planar

Synthesis and Electronic Structure of Neutral Square-Planar High-Spin Iron(II) Complexes Supported by a Dianionic Pincer Ligand

2019 ◽  
Vol 58 (2) ◽  
pp. 1252-1266 ◽  
Author(s):  
Brett M. Hakey ◽  
Jonathan M. Darmon ◽  
Yu Zhang ◽  
Jeffrey L. Petersen ◽  
Carsten Milsmann
Keyword(s):  
Electronic Structure ◽  
High Spin ◽  
Pincer Ligand ◽  
Square Planar ◽  
High Spin Iron

Square-Planar Ruthenium(II) Complexes: Control of Spin State by Pincer Ligand Functionalization

2014 ◽  
Vol 21 (2) ◽  
pp. 579-589 ◽  
Author(s):  
Bjorn Askevold ◽  
Marat M. Khusniyarov ◽  
Wolfgang Kroener ◽  
Klaus Gieb ◽  
Paul Müller ◽  
...  
Keyword(s):  
Spin State ◽  
Pincer Ligand ◽  
Square Planar

Coordinatively- and electronically-unsaturated square planar cobalt(iii) complexes of a pyridine dianionic pincer ligand

2017 ◽  
Vol 46 (46) ◽  
pp. 16228-16235 ◽  
Author(s):  
Faidh Hana ◽  
Alan J. Lough ◽  
Gino G. Lavoie
Keyword(s):  
Cobalt Hydroxide ◽  
Pincer Ligand ◽  
Square Planar

Coordinatively- and electronically-unsaturated cobalt(iii) complexes supported by a dianionic ligand were studied, resulting in the first structurally-characterized square-planar cobalt hydroxide complex.

Amido Complexes of Iridium with a PNP Pincer Ligand: Reactivity toward Alkynes and Hydroamination Catalysis

2018 ◽  
Vol 37 (15) ◽  
pp. 2618-2629 ◽  
Author(s):  
Pablo Hermosilla ◽  
Pablo López ◽  
Pilar García-Orduña ◽  
Fernando J. Lahoz ◽  
Víctor Polo ◽  
...  
Keyword(s):  
Pincer Ligand ◽  
Amido Complexes ◽  
Ligand Reactivity

scholarly journals Nickel(II) carbonyl, ammonia, and acetonitrile complexes supported by a pyridine dipyrrolide pincer ligand

2020 ◽  
Vol 76 (11) ◽  
pp. 1741-1747
Author(s):  
H. V. Rasika Dias ◽  
Abhijit Pramanik
Keyword(s):  
Carbon Monoxide ◽  
Crystal Structures ◽  
Free Ligand ◽  
Nickel Complexes ◽  
Planar Geometry ◽  
Pincer Ligand ◽  
Donor Ligand ◽  
Square Planar ◽  
Coordination Spheres

The synthesis, isolation and crystal structures of nickel(II) carbonyl, acetonitrile and ammonia complexes supported by a dianionic, pyridine dipyrrolide pincer ligand [pyrr2py]2−, namely, carbonyl[2,2′-(pyridine-2,6-diyl)bis(3,5-di-p-tolylpyrrolido-κN)]nickel(II), [Ni(C41H33N3)(CO)], ammine[2,2′-(pyridine-2,6-diyl)bis(3,5-di-p-tolylpyrrolido-κN)]nickel(II), [Ni(C41H33N3)(NH3)], and (acetonitrile-κN)[2,2′-(pyridine-2,6-diyl)bis(3,5-di-p-tolylpyrrolido-κN)]nickel(II), [Ni(C41H33N3)(CH3CN)], as well as the free ligand 2,6-bis(3,5-di-p-tolylpyrrol-2-yl)pyridine, C41H35N3 or [pyrr2py]H2 are reported. The nickel complexes are four-coordinate and adopt a square-planar geometry. The CO stretch of the nickel-bound carbon monoxide ligand of [pyrr2py]Ni(CO) has been observed at 2101 cm−1. The ammonia and acetonitrile complexes, [pyrr2py]Ni(NH3) and [pyrr2py]Ni(NCMe) feature all-nitrogen coordination spheres around nickel consisting of different N-donor ligand types.

Crystal chemistry of high-Tc superconductors

1990 ◽  
Vol 48 (4) ◽  
pp. 1118-1119
Author(s):  
Maryvonne Hervieu
Keyword(s):  
Oxygen Deficiency ◽  
Large Family ◽  
Copper Oxides ◽  
High Tc Superconductors ◽  
High Tc ◽  
Single Mechanism ◽  
Square Planar ◽  
History Of ◽  
Bismuth Cuprates ◽  
New Compounds

Four years after the discovery of superconductivity at high temperature in the Ba-La-Cu-O system, more than thirty new compounds have been synthesized, which can be classified in six series of copper oxides: La2CuO4 - type oxides, bismuth cuprates, YBa2Cu3O7 family, thallium cuprates, lead cuprates and Nd2CuO4 - type oxides. Despite their quite different specific natures, close relationships allow their structures to be simply described through a single mechanism. The fifth first families can indeed be described as intergrowths of multiple oxygen deficient perovskite slabs with multiple rock salt-type slabs, according to the representation [ACuO3-x]m [AO]n.The n and m values are integer in the parent structures, n varying from 0 to 3 and m from 1 to 4; every member of this large family can thus be symbolized by [m,n]. The oxygen deficient character of the perovskite slabs involves the existence or the co-existence of several types of copper environment: octahedral, pyramidal and square planar.Both mechanisms, oxygen deficiency and intergrowth, are well known to give rise easily to nonstoichiometry phenomena. Numerous and various phenomena have actually been characterized in these cuprates, strongly depending on the thermal history of the samples.

Effect of Hydrated Metal Salts on the Coordination Product of Cobalt(II) halide and PNP Type Ligand, 2,6-bis(di-tertbutylphosphinomethyl) pyridine

2018 ◽  
Author(s):  
Tasneem Siddiquee ◽  
Abdul Goni
Keyword(s):  
Metal Salts ◽  
Molar Ratio ◽  
Pincer Complexes ◽  
Asymmetric Unit ◽  
X Ray Diffraction ◽  
Pincer Ligand ◽  
Tetrahedral Geometry ◽  
X Ray ◽  
Distorted Tetrahedral Geometry ◽  
Cobalt Center

Chemical treatment of CoX<sub>2</sub><b><sup>. </sup></b>6H<sub>2</sub>O (X = Cl, Br, I) with the potentially tridentate PNP pincer ligand 2,6-bis(di-<i>tert</i>-butylphosphinomethyl)pyridine in 1:1 molar ratio results in cobalt(II) halide-PNP pincer complexes. The effect of the hydrated metal source on molecular structure and geometry of the complexes was studied by single crystal X-ray diffraction analysis. The complexes are neutral and the cobalt center adopts a penta-coordinate system with potential atropisomerization. Within the unit cell there are two distinct molecules per asymmetric unit. One of the two phosphorus atoms in the PNP ligand was observed to be partially oxidized to phosphinoxide. Disorder in the structure reflects a mixture of square pyramidal and distorted tetrahedral geometry.

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