scholarly journals 2D and 3D Supramolecular Structures of trans- and cis-Octahedral Coordination Compounds of Ethyl-5-methyl-4-imidazolecarboxylate with Transition Metal Ions

2017 ◽  
Vol 56 (1) ◽  
Author(s):  
Víctor Adán Barrera-Guzmán ◽  
Raúl Ramírez-Trejo ◽  
Edgar Omar Rodríguez-Hernández ◽  
Noráh Barba- Behrens
Keyword(s):  
Hydrogen Bonding ◽  
Coordination Compounds ◽  
Transition Metal Ions ◽  
Water Molecules ◽  
Supramolecular Arrangements ◽  
Important Intermediate ◽  
Coordinated Water ◽  
2D And 3D ◽  
Nitrate Anions ◽  
Pleated Sheet

Ethyl-5-methyl-4-imidazolecarboxylate (emizco) is an important intermediate in the synthesis of pharmacological active compounds. In this work, there were synthetized and characterized the following coordination compounds with emizco: <em>trans</em>-[Co(emizco)<sub>2</sub>(H<sub>2</sub>O)<sub>2</sub>](NO<sub>3</sub>)<sub>2</sub> <strong>1</strong>, <em>trans</em>-[Ni(emizco)<sub>2</sub>(H<sub>2</sub>O)<sub>2</sub>](NO<sub>3</sub>)<sub>2</sub> <strong>2</strong>, <em>trans</em>-[Cd(emizco)<sub>2</sub>(H<sub>2</sub>O)<sub>2</sub>](NO<sub>3</sub>)<sub>2</sub> (<strong>3</strong>) and <em>cis</em>-[Cd(emizco)<sub>2</sub>Br<sub>2</sub>] (<strong>4</strong>). 2D or 3D supramolecular arrangements were stabilized. All nitrate <em>trans</em> octahedral compounds stabilized a 3D supramolecular arrangement <em>via</em> hydrogen bonding, throughout the nitrate anions, the ligand and the coordinated water molecules; the <em>cis</em>-octahedral halide complex formed a 2D pleated sheet arrangement, by intermolecular π stacking and halide-hydrogen bonding.

scholarly journals Diaquabis{4-[(pyridin-2-yl)methylideneamino]benzenesulfonato-κ2 N,N′}nickel(II) tetrahydrate

2012 ◽  
Vol 68 (6) ◽  
pp. m809-m810 ◽  
Author(s):  
Chao-Zhu Li ◽  
Xue-Ren Huang
Keyword(s):  
Hydrogen Bonding ◽  
Three Dimensional ◽  
Title Complex ◽  
Water Molecules ◽  
Framework Structure ◽  
Distorted Octahedral Environment ◽  
Hydrogen Bonding Interactions ◽  
Octahedral Environment ◽  
Distorted Octahedral ◽  
Coordinated Water

In the title complex, [Ni(C12H9N2O3S)2(H2O)2]·4H2O, the NiII ion is coordinated by four N atoms from two bidentate chelating 4-[(pyridin-2-yl)methylideneamino]benzenesulfonate ligands and two O atoms from cis-related water molecules in a slightly distorted octahedral environment [Ni—N = 2.071 (3)–2.121 (3) Å and Ni—O = 2.071 (2) and 2.073 (3) Å]. In the crystal, the coordinated water molecules and the four water molecules of solvation are involved in intermolecular O—H...O hydrogen-bonding interactions with water and sulfonate O-atom acceptors, giving a three-dimensional framework structure.

A Pyrazine-Bridged Ni(II) Coordination Polymer

2002 ◽  
Vol 57 (11) ◽  
pp. 1191-1194 ◽  
Author(s):  
Chirantan Roy Choudhury ◽  
Subrata Kumar Dey ◽  
Sutapa Sen ◽  
Bappaditya Bag ◽  
Samiran Mitra ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Chain Structure ◽  
Water Molecules ◽  
Polymeric Complex ◽  
X Ray Diffraction ◽  
Intermolecular Hydrogen Bonds ◽  
X Ray ◽  
Elemental Analyses ◽  
Coordinated Water ◽  
Nitrate Anions

The single pyrazine-bridged polymeric complex {[Ni(pyz)(H2O)4](NO3)2.2H2O}n has been synthesised and characterised by elemental analyses, IR and UV-vis spectra, and a single-crystal X-ray diffraction study. The coordination around the Ni centre is perfectly octahedral. The Ni(H2O)4 coordination planes are bridged by pyrazine ligands forming an infinite chain structure. Two nitrate anions and two water molecules exist in the lattice and are linked by intermolecular hydrogen bonds to the coordinated water molecules.

A hexaniobate expanded by six [Hg(cyclam)]2+ complexes via Hg–O bonds yields a positively charged polyoxoniobate cluster

2020 ◽  
Vol 75 (1-2) ◽  
pp. 233-237 ◽  
Author(s):  
Philipp Müscher-Polzin ◽  
Christian Näther ◽  
Wolfgang Bensch
Keyword(s):  
Hydrogen Bonding ◽  
Title Compound ◽  
Room Temperature ◽  
Bond Formation ◽  
Water Molecules ◽  
The Novel ◽  
Temperature Reaction ◽  
Crystal Water ◽  
Nitrate Anions ◽  
Positively Charged

AbstractThe room temperature reaction of Hg(NO3)2 · H2O, cyclam (cyclam = 1,4,8,11-tetraazacyclotetradecane) and K8{Nb6O19} · 16 H2O in a mixture of H2O and DMSO led to crystallization of the novel compound {[Hg(cyclam)]6Nb6O19}(NO3)4 · 14 H2O, which is the first mercury containing polyoxoniobate. The structure consists of a {Nb6O19}8− cluster core which is expanded by six [Hg(cyclam)]2+ complexes via Hg–μ2-O–Nb bond formation. The title compound contains a positively charged polyoxoniobate cluster. The crystal water molecules form small aggregates by O–H · · · O hydrogen bonding which are joined into larger aggregates by N–O · · · H–O hydrogen bonding integrating the nitrate anions.

Two cadmium(II) fluorous coordination compounds tuned by different bipyridines

2017 ◽  
Vol 73 (5) ◽  
pp. 424-429 ◽  
Author(s):  
Ya-Jie Kong ◽  
Peng Li ◽  
Li-Juan Han ◽  
Lu-Tong Fan ◽  
Peng-Peng Li ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Coordination Compounds ◽  
Linear Chain ◽  
Three Dimensional ◽  
Chain Structure ◽  
Water Molecules ◽  
Hydrogen Bond Acceptor ◽  
Small Surface ◽  
One Dimensional ◽  
Coordinated Water

Fluorine is the most electronegative element and can be used as an excellent hydrogen-bond acceptor. Fluorous coordination compounds exhibit several advantageous properties, such as enhanced high thermal and oxidative stability, low polarity, weak intermolecular interactions and a small surface tension compared to hydrocarbons. C—H...F—C interactions, although weak, play a significant role in regulating the arrangement of the organic molecules in the crystalline state and stabilizing the secondary structure. Two cadmium(II) fluorous coordination compounds formed from 2,2′-bipyridine, 4,4′-bipyridine and pentafluorobenzoate ligands, namely catena-poly[[aqua(2,2′-bipyridine-κ2 N,N′)(2,3,4,5,6-pentafluorobenzoato-κO)cadmium(II)]-μ-2,3,4,5,6-pentafluorobenzoato-κ2 O:O′], [Cd(C7F5O2)2(C10H8N2)(H2O)] n , (1), and catena-poly[[diaquabis(2,3,4,5,6-pentafluorobenzoato-κO)cadmium(II)]-μ-4,4′-bipyridine-κ2 N:N′], [Cd(C7F5O2)2(C10H8N2)(H2O)2] n , (2), have been synthesized solvothermally and structurally characterized. Compound (1) shows a one-dimensional chain structure composed of Cd—O coordination bonds and is stabilized by π–π stacking and O—H...O hydrogen-bond interactions. Compound (2) displays a one-dimensional linear chain structure formed by Cd—N coordination interactions involving the 4,4′-bipyridine ligand. Adjacent one-dimensional chains are extended into two-dimensional sheets by O—H...O hydrogen bonds between the coordinated water molecules and adjacent carboxylate groups. Moreover, the chains are further linked by C—H...F—C interactions to afford a three-dimensional network. In both structures, hydrogen bonding involving the coordinated water molecules is a primary driving force in the formation of the supramolecular structures.

scholarly journals Tetraaqua[3-oxo-1,3-bis(pyridinium-2-yl)propan-1-olato]nickel(II) tribromide dihydrate

2020 ◽  
Vol 76 (2) ◽  
pp. 270-272
Author(s):  
Barry L. Westcott ◽  
Guy Crundwell ◽  
Nilda L. Alicea-Velázquez
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Title Compound ◽  
Enol Form ◽  
Water Molecules ◽  
Hydration Water ◽  
Hydrogen Bonding Interactions ◽  
Coordinated Water ◽  
Additional Hydrogen

The crystal structure of the title compound, [Ni(C13H11N2O2)(H2O)4]Br3·2H2O, contains an octahedral NiII atom coordinated to the enol form of 1,3-dipyridylpropane-1,3-dione (dppo) and four water molecules. Both pyridyl rings on the ligand are protonated, forming pyridinium rings and creating an overall ligand charge of +1. The protonated nitrogen-containing rings are involved in hydrogen-bonding interactions with neighoring bromide anions. There are many additional hydrogen-bonding interactions involving coordinated water molecules on the NiII atom, bromide anions and hydration water molecules.

scholarly journals Synthesis, Characterization and Single Crystal X–ray Crystallography of Nd(III) and Pr(III) Complexes with the Tridentate Schiff Base Ligand N'–(1–(pyridin–2–yl)ethylidene)nicotinohydrazide

2021 ◽  
pp. 99-117
Author(s):  
Moussa Faye ◽  
Papa Aly Gaye ◽  
Mouhamadou Moustapha Sow ◽  
Moussa Dieng ◽  
Farba Bouyagui Tamboura ◽  
...  
Keyword(s):  
Single Crystal ◽  
Metal Ion ◽  
Water Molecules ◽  
Monoclinic Space Group ◽  
Space Group ◽  
X Ray ◽  
X Ray Crystallography ◽  
Coordinated Water ◽  
Tridentate Schiff Base ◽  
Nitrate Anions

The use of N'–(1–(pyridin–2–yl)ethylidene)nicotinohydrazide (HL) in lanthanide(III) chemistry has yielded one mononuclear and one dinuclear complexes. The 1:1 Nd(NO3)3.6H2O or Pr(CH3COO)3.6H2O/HL in methanol afforded the complexes [Nd (HL)2(NO3)2(H2O)2].(NO3) (1) and {[Pr(L)(h2–OOCCH3)(H2O)](h1:h2:m–OOCCH3)2[Pr (L)(h2–OOCCH3)(H2O)]} (2). The structures of the complexes were solved by single crystal X–ray crystallography. In the mononuclear complex, the Nd3+ atom is coordinated by two neutral molecules of ligand acting in tridentate fashion, two nitrate anions acting in bidentate manner and two coordinated water molecules yielding a twelve–coordinated Nd atom. In the complex (2) the Pr3+ atoms are doubly bridged by two acetates anions and each metal ion is coordinated by one tridentate monodeprotonated molecule ligand, one bidentate acetate group and one coordinated water molecule. Each Pr3+ atom is nine–coordinated with an environment best described as a tricapped prismatic geometry. Complex 1 crystallizes in the monoclinic space group C2/c with the following parameters: a = 22.7657(8) Å, b = 8.4276(3) Å, c = 18.0831(7) Å, b = 114.851(2)°, V = 3148.2(2) Å3, Z = 4, R1 = 0.032, wR2 = 0.098. Complex 2 crystallizes in the monoclinic space group P21/n with the following parameters: a = 11.5388(6) Å, b = 14.1087(8) Å, c = 12.2833(6) Å, b = 102.211(2)°, V = 1954.45(18) Å3, Z = 2, R1 = 0.029, wR2 = 0.066. The supramolecular structures are consolidated by multiple hydrogen bonds.

scholarly journals Energetics competition in centrally four-coordinated water clusters and Raman spectroscopic signature for hydrogen bonding

RSC Advances ◽  
2017 ◽  
Vol 7 (19) ◽  
pp. 11680-11683 ◽  
Author(s):  
Bo Wang ◽  
Wanrun Jiang ◽  
Yang Gao ◽  
Zhiyuan Zhang ◽  
Changqing Sun ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Water Clusters ◽  
Water Molecules ◽  
Raman Spectroscopic ◽  
Central Molecule ◽  
Coordinated Water

Viaseparating the H-bonded neighbour molecules of centrally four-coordinated water molecules from other molecules in outer cages, the calculations discover these two regions interact competitively with the central molecule.

Poly[diaqua[μ4-4-(isonicotinamido)phthalato]nickel(II)] displaying ansratopology

2013 ◽  
Vol 69 (10) ◽  
pp. 1124-1127
Author(s):  
Man-Sheng Chen ◽  
Jin-Sheng Xu ◽  
Yi-Fang Deng ◽  
Chun-Hua Zhang
Keyword(s):  
Hydrogen Bonding ◽  
Title Compound ◽  
Three Dimensional ◽  
Dimensional Structure ◽  
Water Molecules ◽  
Coordination Geometry ◽  
Distorted Octahedral Coordination ◽  
Distorted Octahedral Coordination Geometry ◽  
Distorted Octahedral ◽  
Coordinated Water

In the title compound, [Ni(C14H8N2O5)(H2O)2]n, the NiIIcation is six-coordinate with a slightly distorted octahedral coordination geometry and the 4-(isonicotinamido)phthalate ligand links the NiIIcentres into a three-dimensional structure withsratopology. The structure is also stabilized by N—H...O hydrogen bonding between the uncoordinated amide groups of the ligand and extensive O—H...O hydrogen bonding between the two coordinated water molecules. The magnetic and thermal stability properties of the title compound are also discussed.

Sign in / Sign up

Export Citation Format

Share Document