Synthesis and Structural Characterisation of Lithium, Zinc, and Aluminium Pyrazolate Complexes

2020 ◽  
Vol 73 (6) ◽  
pp. 520 ◽  
Author(s):  
Nazli E. Rad ◽  
Peter C. Junk ◽  
Glen B. Deacon ◽  
Ilya V. Taidakov ◽  
Jun Wang
Keyword(s):  
Hydrogen Bonding ◽  
Zinc Complex ◽  
Polymeric Compound ◽  
Coordination Modes ◽  
Structural Characterisation ◽  
Hexanuclear Complex ◽  
Tetrameric Complex

The reaction of nBuLi with 3,5-dimethylpyrazole (Me2pzH) in Et2O or tmeda/hexane (tmeda=N,N,N′,N′-tetramethylethane-1,2-diamine) and with 3,5-dimethyl-4-nitropyrazolate (Me2pzHNO2) in THF results in the formation of three structurally diverse lithium pyrazolates: namely an Et2O-solvated tetrameric complex [Li4(Me2pz)4(OEt2)4], bridged entirely with μ-η2:η1-pyrazolate bonding, a hexanuclear complex [Li6(Me2pz)6(tmeda)2] with four different coordination modes (μ-η1:η1, μ-η2:η1, μ3-η1:η2:η1 and μ3-η2:η2:η1), and a new polymeric compound [Li2(Me2pzNO2)2(thf)2]n, with [Li2(Me2pzNO2)2(thf)2] groups linked by –NO2 coordination. A mononuclear zinc complex [Zn(tBu2pz)2(tBu2pzH)2].1/2THF (tBu2pzH=3,5-di-tert-butylpyrazole) was prepared by reaction of tBu2pzH with ZnEt2, unidentate tBu2pz groups being stabilised by N–H⋯N hydrogen bonding. Treatment of 3,5-diphenylpyrazole (Ph2pzH) with trimethylaluminium (mole ratio 3:1) in THF led to the formation of dinuclear [AlMe2(μ-Ph2pz)]2.1/2THF.

Coordination preference of hexa(2-pyridyl)benzene with copper(ii) directed by hydrogen bonding

CrystEngComm ◽  
2018 ◽  
Vol 20 (35) ◽  
pp. 5233-5240 ◽  
Author(s):  
Hyunchul Kwon ◽  
Eunsung Lee
Keyword(s):  
Hydrogen Bonding ◽  
Coordination Modes

Coordination modes of hexa(2-pyridyl)benzene ligand with copper(ii) ions were controlled by different solvents mainly due to hydrogen bonding.

scholarly journals Synthesis, Structural Characterization and Ligand-Enhanced Photo-Induced Color-Changing Behavior of Two Hydrogen-Bonded Ho(III)-Squarate Supramolecular Compounds

Polymers ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1369 ◽  
Author(s):  
Wang ◽  
Ke ◽  
Feng ◽  
Ho ◽  
Chang ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Uv Light ◽  
Squaric Acid ◽  
Water Molecules ◽  
Light Illumination ◽  
Supramolecular Architecture ◽  
Bridging Ligands ◽  
Coordination Modes ◽  
Oxygen Atoms ◽  
Hydrogen Bonded

Two coordination polymers (CPs) with chemical formulas, [Ho2(C4O4)2(C2O4)(H2O)8]·4H2O (1) and [Ho(C4O4)1.5(H2O)3] (2), (C4O42− = dianion of squaric acid, C2O42− = oxalate), have been synthesized and their structures were determined by single-crystal X-ray diffractometer (XRD). In compound 1, the coordination environment of Ho(III) ion is eight-coordinate bonded to eight oxygen atoms from two squarate, one oxalate ligands and four water molecules. The squarates and oxalates both act as bridging ligands with 1,2-bis-monodentate and bis-chelating coordination modes, respectively, connecting the Ho(III) ions to form a one-dimensional (1D) ladder-like framework. Adjacent ladders are interlinked via O–HO hydrogen bonding interaction to form a hydrogen-bonded two-dimensional (2D) layered framework and then arranged orderly in an AAA manner to construct its three-dimensional (3D) supramolecular architecture. In compound 2, the coordination geometry of Ho(III) is square-antiprismatic eight coordinate bonded to eight oxygen atoms from five squarate ligands and three water molecules. The squarates act as bridging ligands with two coordination modes, 1,2,3-trismonodentate and 1,2-bis-monodentate, connecting the Ho(III) ions to form a 2D bi-layered framework. Adjacent 2D frameworks are then parallel stacked in an AAA manner to construct its 3D supramolecular architecture. Hydrogen bonding interactions between the squarate ligands and coordinated water molecules in 1 and 2 both play important roles on the construction of their 3D supramolecular assembly. Compounds 1 and 2 both show remarkable ligand-enhanced photo-induced color-changing behavior, with their pink crystals immediately turning to yellow crystals under UV light illumination.

Hydrogen bonding promotes diversity in nitrite coordination modes at a single iron(II) center

2020 ◽  
Vol 73 (17-19) ◽  
pp. 2664-2676 ◽  
Author(s):  
D. M. M. Mevan Dissanayake ◽  
Brittney E. Petel ◽  
William W. Brennessel ◽  
Kara L. Bren ◽  
Ellen M. Matson
Keyword(s):  
Hydrogen Bonding ◽  
Coordination Modes

Synthesis and Structural Characterisation of a Hexanuclear TiIV Compound Ti6(μ2-O)2(μ3-O)2(μ2-OC4H9)2(OC4H9)6(OOCCHCl2)8

2010 ◽  
Vol 65 (2) ◽  
pp. 147-151 ◽  
Author(s):  
Ashutosh Pandey ◽  
Anjana Pandey ◽  
Sadhana Singh ◽  
Peter Mayer ◽  
Wolfgang J. Parakd
Keyword(s):  
Ambient Temperature ◽  
Toluene Solution ◽  
Dichloroacetic Acid ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structural Characterisation ◽  
Hexanuclear Complex

Titanium tetra-butoxide was reacted with dichloroacetic acid in 1 : 1 and 1 : 2 molar ratio in toluene at ambient temperature to give, respectively, the mono- and bis-substituted products Ti(OBun)3(OOCCHCl2) and Ti(OBun)2(OOCCHCl2)2 (1) in quantitative yields. However, when a toluene solution of compound 1 was kept at −20 ◦C for crystallisation, colourless crystals of a hexanuclear complex Ti6(μ2-O)2(μ3-O)2(μ2-OC4H9)2(OC4H9)6(OOCCHCl2)8 (2) were obtained. The basic skeletal arrangement of compound 2, as revealed by X-ray diffraction, can be described as corner-removed, inversion-related [Ti-O]4 cubes with face-linked oxide bridges.

The Synthesis and Structures of Tris(2-pyridylseleno)methyl Zinc Compounds with κ2-, κ3-, and κ4-Coordination Modes

2013 ◽  
Vol 66 (10) ◽  
pp. 1306 ◽  
Author(s):  
Yi Rong ◽  
Gerard Parkin
Keyword(s):  
1H Nmr ◽  
Zinc Complex ◽  
Variable Temperature ◽  
Spectroscopic Studies ◽  
Zinc Compounds ◽  
Coordination Modes

Tris(2-pyridylseleno)methane, [Tpsem]H, has been employed to synthesize the bis(trimethylsilyl)amido zinc complex [κ3-Tpsem]ZnN(SiMe3)2. The latter compound provides access to a variety of other [Tpsem]ZnX derivatives, which include the isocyanate complex [κ4-Tpsem]ZnNCO, the hydrosulfido complex [κ3-Tpsem]ZnSH, the sulfido complex {[κ3-Tpsem]Zn}2(μ-S), the 2 : 1 complex [κ2-Tpsem]2Zn and the pyridyl-2-selenolate complex [κ4-Tpsem]Zn-(κ2-SeC6H4N), thereby demonstrating that the [Tpsem] ligand can exhibit κ2-, κ3-, and κ4-coordination modes. Variable-temperature 1H NMR spectroscopic studies demonstrate that [κ3-Tpsem]ZnN(SiMe3)2, [κ3-Tpsem]ZnSH, and {[κ3-Tpsem]Zn}2(μ-S) are fluxional on the NMR timescale.

scholarly journals Characterisation of isothiocyanic acid, HNCS, in the solid state: trapped by hydrogen bonding

2016 ◽  
Vol 52 (90) ◽  
pp. 13296-13298 ◽  
Author(s):  
Stefano Nuzzo ◽  
Brendan Twamley ◽  
James A. Platts ◽  
Robert J. Baker
Keyword(s):  
Hydrogen Bond ◽  
Hydrogen Bonding ◽  
Solid State ◽  
Dft Calculations ◽  
Strong Hydrogen Bond ◽  
Structural Characterisation ◽  
Image Courtesy

The structural characterisation of [Ph4P][NCS]·HNCS is reported and structurally characterised. DFT calculations and spectroscopy show a strong hydrogen bond (image courtesy of ESO).

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