ChemInform Abstract: Coordination Chemistry with Pyrazole-Based Chelating Ligands: Molecular Structural Aspects

ChemInform ◽  
2010 ◽  
Vol 31 (33) ◽  
pp. no-no
Author(s):  
Rabindranath Mukherjee
Keyword(s):  
Coordination Chemistry ◽  
Chelating Ligands ◽  
Structural Aspects

Organophosphines in organoplatinum complexes: structural aspects of trans-PtP2C2 derivatives

2017 ◽  
Vol 37 (1) ◽  
pp. 1-10
Author(s):  
Milan Melník ◽  
Peter Mikuš
Keyword(s):  
Coordination Sphere ◽  
Coordination Mode ◽  
Structural Parameters ◽  
Donor Ligands ◽  
Chelating Ligands ◽  
Mean Values ◽  
Structural Aspects

AbstractThis review summarized and analyzed the structural parameters of 174 monomeric organoplatinum complexes with an inner coordination sphere of trans-PtP2C2. These complexes crystallized in four crystal systems: hexagonal (x2), orthorhombic (x13), triclinic (x76), and monoclinic (x84). These complexes, on the basis of the coordination mode of the respective donor ligands, can be divided into the seven sub-groups: Pt(PL)2(CL)2, Pt(PL)2(η2-C2L), Pt(η2-P2L)(CL)2, Pt(PL)(η2-P,CL)(CL), Pt(η2-P,CL)2, Pt(η3-P,C,PL)(CL), and Pt(η3-C,P,CL)(PL). The chelating ligands create 4-, 5-, 6-, 16-, 17-, 18-, and 19-membered rings. The total mean values of Pt-L bond distances are 2.055 Å (C) and 2.300 Å (P). There are examples that exist in two isomeric forms and are examples of distortion isomerism. The structural parameters of trans-PtP2C2 are discussed with those of cis-PtP2C2 derivatives.

scholarly journals Dithiocarbamate Complexes of Platinum Group Metals: Structural Aspects and Applications

Inorganics ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 60
Author(s):  
Yee Seng Tan ◽  
Chien Ing Yeo ◽  
Edward R. T. Tiekink ◽  
Peter J. Heard
Keyword(s):  
Coordination Chemistry ◽  
Solid State ◽  
Metal Complexes ◽  
Platinum Group Metal ◽  
Platinum Group Metals ◽  
Nmr Studies ◽  
Solution Behavior ◽  
Bioactive Materials ◽  
Platinum Group ◽  
Structural Aspects

The incorporation of dithiocarbamate ligands in the preparation of metal complexes is largely prompted by the versatility of this molecule. Fascinating coordination chemistry can be obtained from the study of such metal complexes ranging from their preparation, the solid-state properties, solution behavior as well as their applications as bioactive materials and luminescent compounds, to name a few. In this overview, the dithiocarbamate complexes of platinum-group elements form the focus of the discussion. The structural aspects of these complexes will be discussed based upon the intriguing findings obtained from their solid- (crystallographic) and solution-state (NMR) studies. At the end of this review, the applications of platinum-group metal complexes will be discussed.

scholarly journals Mono- and Dinuclear Aluminium Complexes Derived from Biguanide and Carbothiamide Ligands

Inorganics ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 52
Author(s):  
Maximilian Dehmel ◽  
Helmar Görls ◽  
Robert Kretschmer
Keyword(s):  
Coordination Chemistry ◽  
Solid State ◽  
Coordination Polymer ◽  
Diffraction Analysis ◽  
Crucial Role ◽  
Chelating Ligands ◽  
X Ray Diffraction ◽  
One Dimensional ◽  
X Ray ◽  
Solid State Structures

Dianionic N,N-chelating ligands play a crucial role in coordination chemistry, but reports on related complexes remain limited to certain types of ligands. In here, the reactions of two diprotic ligands, i.e., a biguanide and a carbothiamide, with trimethylaluminium, are reported, which give rise to mono- and dinuclear aluminium(III) complexes. In addition, single deprotonation of the diprotic biguanide using potassium bis(trimethylsilyl)amide gives rise to a one-dimensional coordination polymer. All complexes have been fully characterized, and their solid-state structures were determined by single crystal X-ray diffraction analysis.

Chiral Heterocyclic Ligands. VIII. Syntheses and Complexes of New Chelating Ligands Derived From Camphor

1995 ◽  
Vol 48 (9) ◽  
pp. 1549 ◽  
Author(s):  
AA Watson ◽  
DA House ◽  
PJ Steel
Keyword(s):  
Coordination Chemistry ◽  
Transition Metals ◽  
Crystal Structures ◽  
Palladium Complexes ◽  
Chelating Ligands ◽  
Heterocyclic Ligands ◽  
X Ray

The syntheses of 23 new chelating ligands are described. Most of these ligands are derived from the chiral pyrazole (1) which has been linked to a variety of heterocycles , namely pyridine, pyrimidine, pyridazine, isoxazole , benzimidazole, thiophen and furan. In certain cases the parent achiral analogues have also been prepared. Preliminary studies of the coordination chemistry of these ligands with selected transition metals have been carried out. The X-ray crystal structures of palladium complexes of isoxazole- and thiophen-containing ligands have also been determined.

Organophosphines in PtP4 derivatives; structural aspects

2019 ◽  
Vol 39 (3) ◽  
pp. 129-137
Author(s):  
Milan Melník ◽  
Peter Mikuš
Keyword(s):  
Coordination Sphere ◽  
Coordination Mode ◽  
Covalent Bond ◽  
Structural Data ◽  
Coordination Complexes ◽  
Chelating Ligands ◽  
Mean Values ◽  
Structural Aspects

AbstractIn this review, we classify and analyze the structural data of more than 80 monomeric platinum coordination complexes with an inner coordination sphere of PtP4 in which only organophosphines are involved. On the basis of the coordination mode of respective organophosphines, these complexes can be divided into six subgroups: Pt(PL)4, Pt(PL)2(PL′)2, Pt(η2-P2L)(PL)2, Pt(η2-P2L)2, Pt(η2-P2L)(η2-P2L′)2, and Pt(η4-P4L). The chelating ligands forming wide varieties of metallocycles: (P=P), (PNP), (PCP), (PC2P), (PP2P), (PC2NP), (PNCNP), (PNPNP), (POHOP), (POBOP), (PCNCP), (PC3P), (PC4P), and (PC2OC2P). The effects of both steric and electronic factors reflect on the values of P-Pt-P chelate angles. The total mean values of Pt-P elongate in the order: 2.289 Å (tetradentate)<2.306 Å (monodentate)<2.320 Å (bidentate). The same order shows the respective covalent bond weaknesses.

scholarly journals Hydrogen bonding patterns in hydroxyamidine/α-aminonitrone (AMOX) type compounds

2014 ◽  
Vol 70 (a1) ◽  
pp. C539-C539
Author(s):  
Mihaela Cibian ◽  
Sofia Derossi ◽  
Denis Spasyuk ◽  
Janaina Ferreira ◽  
Garry Hanan
Keyword(s):  
Hydrogen Bonding ◽  
Coordination Chemistry ◽  
Crystal Engineering ◽  
Substituent Effects ◽  
Design Tool ◽  
Supramolecular Interactions ◽  
Chelating Ligands ◽  
Hydrogen Bonding Pattern ◽  
Bonding Patterns

N,N'-Disubstituted hydroxyamidines/ α-aminonitrones (AMOXs) present high steric and electronic modularity (substituents can be varied on the central C atom and/or on the N atoms) resulting in precise electronic tunability, enhanced by the delocalization on the amidine backbone. They are good chelating ligands, forming stable 5-membered chelate rings with metal ions, and they also present hydrogen bonding capacity. [1] In our research, we exploit these properties by investigating their incorporation into supramolecular assemblies based on coordination chemistry and/ or hydrogen bonding. Herein, we present the synthesis and the structural characterization of different mono- and bis-AMOX type compounds. [2] The analysis of the hydrogen bonding patterns found in each case is highlighted (Figure 1), in an effort to identify factors (e.g. substituent effects: sterics and/ or electronics, other type of supramolecular interactions) that are generating specific hydrogen-bonding patterns. Understanding and rationalizing such a cause – effect relationship is of paramount importance in order to efficiently use hydrogen bonding as a crystal engineering design tool. Figure 1. Type of hydrogen bonding pattern in AMOX type compounds. [3]

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