Synthesis and structural characterization of a new heterometallicmolybdate coordination polymer based on a µ3-bridging amino alcohol

2022 ◽  
Vol 0 (0) ◽  
Author(s):  
Savita A. Kundaikar ◽  
Sudesh M. Morajkar ◽  
Wolfgang Bensch ◽  
Bikshandarkoil R. Srinivasan
Keyword(s):  
Coordination Polymer ◽  
Room Temperature ◽  
Binding Mode ◽  
Water Molecules ◽  
Inversion Center ◽  
Oh Groups ◽  
Heterometallic Coordination Polymer ◽  
Anionic Ligand ◽  
Hydrogen Bonding Interactions

Abstract The reaction of Na2MoO4·2H2O with 2-amino-2-(hydroxymethyl)propane-1,3-diol (LH) in water at room temperature results in the formation of the heterometallic coordination polymer [Mo2O6L2(Na2(H2O)4)]·2H2O 1 (L = 2-amino-3-hydroxy-2-(hydroxymethyl)propan-1-olato). The structure of 1 consists of a neutral (Mo2O6) unit located on an inversion center. The Mo atoms exhibit hexa-coordination and are bonded to two terminal and two bridging oxido ligands, an alkoxide oxygen and the amine N atoms of an anionic ligand L– resulting in the formation of an edge-sharing {Mo2O8N2} bioctahedron. The Na+ cations of a centrosymmetric bis(μ2-aqua)-bridged (Na2(H2O)4)2+ unit are penta-coordinated and bonded to two symmetry related L– ligands via the oxygen atoms of their OH groups. The µ3-bridging tetradentate binding mode of L– results in the formation of a two-dimensional heterometallic coordination polymer. The constituents of 1 viz. (Mo2O6), (L)–, (Na2(H2O)4)2+ and lattice water molecules are interlinked with the aid of three varieties of hydrogen bonding interactions. The corresponding tungstate reported recently has been obtained through a similar synthetic protocol and is isostructural.

scholarly journals Chemical-Vapor-Deposited Graphene as Charge Storage Layer in Flash Memory Device

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
W. J. Liu ◽  
L. Chen ◽  
P. Zhou ◽  
Q. Q. Sun ◽  
H. L. Lu ◽  
...  
Keyword(s):  
Flash Memory ◽  
Room Temperature ◽  
Metal Layer ◽  
Chemical Vapor ◽  
Charge Trapping ◽  
Memory Device ◽  
Water Molecules ◽  
Oh Groups ◽  
Chemical Vapor Deposited ◽  
A Charge

We demonstrated a flash memory device with chemical-vapor-deposited graphene as a charge trapping layer. It was found that the average RMS roughness of block oxide on graphene storage layer can be significantly reduced from 5.9 nm to 0.5 nm by inserting a seed metal layer, which was verified by AFM measurements. The memory window is 5.6 V for a dual sweep of ±12 V at room temperature. Moreover, a reduced hysteresis at the low temperature was observed, indicative of water molecules or −OH groups between graphene and dielectric playing an important role in memory windows.

Redetermination of trans-diaquabis(picolinato-κ2 N,O)cobalt(II) dihydrate

2006 ◽  
Vol 62 (4) ◽  
pp. m796-m798 ◽  
Author(s):  
Zerrin Heren ◽  
Cem Cüneyt Ersanlı ◽  
Cem Keser ◽  
Nazan Ocak Ískeleli
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Title Compound ◽  
Three Dimensional ◽  
Water Molecules ◽  
Inversion Center ◽  
Hydrogen Bonding Interactions ◽  
Dimensional Network ◽  
Distorted Octahedral

The crystal structure of the title compound, [Co(C6H4NO2)2(H2O)2]·2H2O, has been reinvestigated with improved precision [previous reports: Chang et al. (1972). J. Coord. Chem. 2, 31–34; Lumme et al. (1969). Suom. Kemistil. B, 42, 270]. In the title compound, the Co atom is located on an inversion center and its coordination can be described as slightly distorted octahedral, equatorially trans-coordinated by two N and O atoms of two picolinate ligands and axially coordinated by two O atoms of the water molecules. Intermolecular O—H...O and C—H...O hydrogen-bonding interactions result in the formation of an intricate three-dimensional network.

scholarly journals Diaquabis[5-(pyrazin-2-yl-κN1)-3-(pyridin-3-yl)-1,2,4-triazolido-κN1]zinc

2014 ◽  
Vol 70 (4) ◽  
pp. m116-m116
Author(s):  
Ye-Nan Wang ◽  
Wen-Wen Dong
Keyword(s):  
Hydrogen Bonds ◽  
Three Dimensional ◽  
Triazole Ring ◽  
Octahedral Geometry ◽  
Water Molecules ◽  
Stacking Interactions ◽  
Supramolecular Architecture ◽  
Inversion Center ◽  
Aromatic Rings ◽  
Anionic Ligand

In the title compound, [Zn(C11H7N6)2(H2O)2], the ZnIIcation, located on an inversion center, isN,N′-chelated by two 5-(pyrazin-2-yl)-3-(pyridin-3-yl)-1,2,4-triazolide anions and is further coordinated by two water molecules in a distorted N4O2octahedral geometry. In the anionic ligand, the pyrazine and pyridine rings are twisted with respect to the central triazole ring by 5.77 (10) and 11.54 (10)°, respectively. In the crystal, classical O—H...N and weak C—H...O hydrogen bonds and π–π stacking interactions between aromatic rings [the centroid–centroid distances between triazole and pyrazine rings, and between triazole and pyridine rings are 3.623 (2) and 3.852 (2) Å, respectively] connect the molecules into a three-dimensional supramolecular architecture.

scholarly journals Synthesis and structural characterization of a calcium coordination polymer based on a μ 3 -bridging tetradentate binding mode of glycine#

2012 ◽  
Vol 124 (4) ◽  
pp. 781-790 ◽  
Author(s):  
SUBRAMANIAN NATARAJAN ◽  
BIKSHANDARKOIL R SRINIVASAN ◽  
J KALYANA SUNDAR ◽  
K RAVIKUMAR ◽  
R V KRISHNAKUMAR ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Structural Characterization ◽  
Binding Mode

A three-dimensional coordination polymer based on the Zn4(μ3-OH)2unit: poly[[(μ4-benzene-1,4-dicarboxylato)bis(μ3-benzene-1,4-dicarboxylato)bis(μ3-hydroxido)bis(1,10-phenanthroline-5,6-dione)tetrazinc] dihydrate]

2015 ◽  
Vol 71 (2) ◽  
pp. 136-139
Author(s):  
Meng Wen ◽  
Zu-Ping Xiao ◽  
Chun-Ya Wang ◽  
Xi-He Huang
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Coordination Polymer ◽  
Dicarboxylic Acid ◽  
Title Compound ◽  
Three Dimensional ◽  
Water Molecules ◽  
Hydrogen Bonding Interactions ◽  
Carboxylate Groups ◽  
Form Part

The title compound, {[Zn4(C8H4O4)3(OH)2(C12H6N2O2)2]·2H2O}n, has been prepared hydrothermally by the reaction of Zn(NO3)2·6H2O with benzene-1,4-dicarboxylic acid (H2bdc) and 1,10-phenanthroline-5,6-dione (pdon) in H2O. In the crystal structure, a tetranuclear Zn4(OH)2fragment is located on a crystallographic inversion centre which relates two subunits, each containing a [ZnN2O4] octahedron and a [ZnO4] tetrahedron bridged by a μ3-OH group. The pdon ligand chelates to zinc through its two N atoms to form part of the [ZnN2O4] octahedron. The two crystallographically independent bdc2−ligands are fully deprotonated and adopt μ3-κO:κO′:κO′′ and μ4-κO:κO′:κO′′:κO′′′ coordination modes, bridging three or four ZnIIcations, respectively, from two Zn4(OH)2units. The Zn4(OH)2fragment connects six neighbouring tetranuclear units through four μ3-bdc2−and two μ4-bdc2−ligands, forming a three-dimensional framework with uninodal 6-connected α-Po topology, in which the tetranuclear Zn4(OH)2units are considered as 6-connected nodes and the bdc2−ligands act as linkers. The uncoordinated water molecules are located on opposite sides of the Zn4(OH)2unit and are connected to it through hydrogen-bonding interactions involving hydroxide and carboxylate groups. The structure is further stabilized by extensive π–π interactions between the pdon and μ4-bdc2−ligands.

scholarly journals Crystal structure of poly[[μ2-diaqua-diaqua-μ2-L-proline-κ2O:O′-strontium] dibromide]

2015 ◽  
Vol 71 (10) ◽  
pp. 1199-1202 ◽  
Author(s):  
Selladurai Sathiskumar ◽  
Thangavelu Balakrishnan ◽  
Kandasamy Ramamurthi ◽  
Subbiah Thamotharan
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Coordination Polymer ◽  
Supramolecular Structure ◽  
Three Dimensional ◽  
Site Occupancy ◽  
Direct Interaction ◽  
Water Molecules ◽  
Zwitterionic Form ◽  
Hydrogen Bonding Interactions

In the title coordination polymer, {[Sr(C5H9NO2)(H2O)4]Br2}n, the proline molecule exists in a zwitterionic form with one of the ring C atoms disordered over two sites [site-occupancy factors = 0.57 (6):0.43 (6)]. The SrIIion is nine-coordinated by six water O atoms, two monodentate and two μ2-bridging, and three carboxylate O atoms of the proline ligands, with two bridging [Sr—O range = 2.524 (4)–2.800 (5) Å]. In the crystal, there is no direct interaction between the proline molecules. However, the proline and water molecules associate with the bromide counter-anions through a number of intermolecular O—H...Br and N—H...Br hydrogen-bonding interactions, giving a three-dimensional supramolecular structure.

scholarly journals A Novel One-Dimensional Copper Mellitate Complex Featured by {Cu(H2O)2(urea)[C6(COO)4(COOH)2]}n 2n- Polyanions

2019 ◽  
Author(s):  
Roberto Köferstein
Keyword(s):  
Aqueous Solution ◽  
Coordination Polymer ◽  
Oxygen Atom ◽  
Room Temperature ◽  
Water Molecules ◽  
The Novel ◽  
One Dimensional ◽  
Thermoanalytical Investigations ◽  
Decomposition Processes ◽  
Weak Hydrogen Bonds

Blue monoclinic single crystals of the novel one-dimensional [H3N-(CH2)6-NH3][Cu(H2O)2(urea)(μ2-C6(COO)4 (COOH)2)]H2O coordination polymer have beenprepared in aqueous solution at room temperature in the presence of 1,6-diaminohexane andurea. Space group P21/n (no. 14) with a = 958.48(9), b = 1465.74(11), c = 1821.14(12) pm, beta= 97.655(8)°. The Cu2+ cation is coordinated in a square pyramidal manner by two oxygen atoms stemming from the dihydrogen mellitate tetraanion, one oxygen atom from the ureamolecule, and two water molecules. The Cu−O distances are between 193.3(2) and 229.4(2)pm. The connection between Cu2+ and [C6(COO)4(COOH)2]4 yields infinite chain-likepolyanions parallel to [ 01] with a composition of{Cu(H2O)2(urea)[C6(COO)4(COOH)2]}n2n-. The dihydrogen mellitate tetraanion adopts a μ2coordination mode. The [(H3N-(CH2)6-NH3)]2+ cations are accommodated between the chainsas counter cations. The hexane-1,6-diammonium cations adopt a partial synclinal conformation. The chains are connected by strong and weak hydrogen bonds. Magneticmeasurements reveal a paramagnetic Curie-Weiss behaviour and a magnetic moment of 1.93μB per Cu2+. Thermoanalytical investigations in air show that the complex is stable up to 135°C. Following decomposition processes yielding CuO.

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