Hybrid open frameworks (MIL-n). Part 5 Synthesis and crystal structure of MIL-9: a new three-dimensional ferrimagnetic cobalt(II) carboxylate with a two-dimensional array of edge-sharing Co octahedra with 12-membered rings

1998 ◽  
Vol 8 (12) ◽  
pp. 2743-2747 ◽  
Author(s):  
Carine Livage ◽  
Chrystelle Egger ◽  
Marc Nogues ◽  
Gérard Férey
Keyword(s):  
Crystal Structure ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Synthesis And Crystal Structure ◽  
Dimensional Array

Synthesis and crystal structure of the two-dimensional coordination compound potassium oxo-bis(hydroxylamido)-pyridine-2, 3-dicarboxylato-vanadate(V)

2015 ◽  
Vol 70 (6) ◽  
pp. 373-377
Author(s):  
Xiu-Cai Li ◽  
Heng-Qiang Zhang ◽  
Qiong Yang ◽  
Qi-Ying Zhang
Keyword(s):  
Crystal Structure ◽  
Oxygen Atom ◽  
Pyridine Ring ◽  
Three Dimensional ◽  
Pentagonal Bipyramid ◽  
Carboxylate Group ◽  
Two Dimensional ◽  
Compound K ◽  
Synthesis And Crystal Structure ◽  
Oxo Ligand

Abstract:The crystal structure of the title compound, K2[VO(C7H3O4N)(NH2O)2(H2O)]2, is composed of KO9 and VO5N2 polyhedra connected through pyridine-2,3-dicarboxylate (2,3-dipicolinate) bridges. The VO5N2 coordination polyhedron is a pentagonal bipyramid, with hydroxylamido and dipicolinato ligands being bidentate. The axial positions are occupied by the terminal oxo ligand and one oxygen atom from a deprotonated carboxylate group. The oxygen atoms from hydroxylamido and the nitrogen atoms belonging either to the pyridine ring or to the hydroxylamido occupy the equatorial positions and form an approximate pentagonal plane. The irregular KO9 polyhedra are linked, sharing edges and planes to form infinite chains. These chains are linked by the dipicolinate bridges to form layers. The distorted VO5N2 polyhedron is grafted on to the layer by the dipicolinate carboxylate O atom. Adjacent layers are connected through N–H···O hydrogen bonds to form a three-dimensional supramolecular structure.

Synthesis and Crystal Structure of the Novel Three-dimensional Vanadium Coordination Compound Potassium Oxo-bis(hydroxylamido)malonatovanadate(V)

2010 ◽  
Vol 65 (2) ◽  
pp. 157-162 ◽  
Author(s):  
Qi-Ying Zhang ◽  
Heng-Qiang Zhang ◽  
Ai-Guo Kong ◽  
Qian Yang ◽  
Yong-Kui Shan
Keyword(s):  
Crystal Structure ◽  
Coordination Compound ◽  
Three Dimensional ◽  
Title Complex ◽  
Water Molecules ◽  
Coordination Geometry ◽  
The Novel ◽  
Two Dimensional ◽  
Synthesis And Crystal Structure ◽  
Oxo Ligand

In the crystal structure of the title complex, K2[(VO)2(NH2O)4(C3H2O4)2] ・ 3H2O, the V(V) centre is bound to a chelating malonate ligand, two bidentate hydroxylamido ligands and one oxo ligand, defining a pentagonal bipyramidal coordination (VO5N2). The potassium cations are found to adopt two types of coordination geometry with the malonate ligand, the bidentate hydroxylamido ligand and water molecules: the first one is hepta-coordinate in an irregular K(1)O7 polyhedron, and the second one is octa-coordinate in an irregular K(2)O8 polyhedron. The K(1)O7/K(2)O8 and VO5N2 polyhedra are closely linked by sharing faces to form K-V dinuclear units KVO9N2 and KVO10N2, respectively. The two close-packed units, KVO9N2 and KVO10N2, are connected by sharing edges to generate a tetrameric unit K2V2O17N4. Each of these units is joined to four neighbouring units by sharing corners, providing further propagation into a two-dimensional layer. Adjacent layers are connected via the carboxylic oxygen atoms of the malonate units to give a three-dimensional framework in the crystals.

scholarly journals Synthesis and crystal structure of a two-dimensional CoIIcoordination polymer: poly[(μ3-3-carboxybenzoato)[μ2-5-(pyridin-4-yl)-1H,2′H-3,3′-bi[1,2,4-triazole]]cobalt(II)]

2017 ◽  
Vol 73 (11) ◽  
pp. 1779-1781
Author(s):  
Chao-Jun Du ◽  
Xiao-Na Zhao ◽  
Bao-Yong Chen
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Three Dimensional ◽  
The Other ◽  
Two Dimensional ◽  
Coordination Environment ◽  
Synthesis And Crystal Structure ◽  
Carboxylate Groups ◽  
Dimensional Network ◽  
A Chain

In the title compound, [Co(C8H5O4)(C9H6N7)]n, the divalent CoIIatom is six-coordinated to three N atoms from two symmetrical 5-(pyridin-4-yl)-1H,2′H-3,3′-bi[1,2,4-triazole] (H2pyttz) ligands and three O atoms from three symmetrical 3-carboxybenzoate (Hbdic) ligands, leading to a distorted {CoN3O3} octahedral coordination environment. Two CoIIcations are linked by four bridging carboxylate groups to generate a dinuclear [Co2(CO2)4] unit. The dinuclear units are further connected into a chain along [010]viathe Hbdic ligands. The other infinite chain, along [100], is formed through the H2pyttz ligands. Finally, the two kinds of chains are cross-linked, by sharing the CoIIcations, into a two-dimensional network. In the crystal, adjacent layers are further linked by O—H...N hydrogen bonds into a three-dimensional framework.

scholarly journals Synthesis and crystal structure of a new polymorph of potassium europium(III) bis(sulfate) monohydrate, KEu(SO4)2·H2O

2018 ◽  
Vol 74 (2) ◽  
pp. 242-245 ◽  
Author(s):  
Avijit Kumar Paul
Keyword(s):  
Crystal Structure ◽  
Topological Analysis ◽  
Structural Connectivity ◽  
Three Dimensional ◽  
Dimensional Structure ◽  
Monoclinic Space Group ◽  
Hydrothermal Conditions ◽  
Metal Sulfate ◽  
Synthesis And Crystal Structure ◽  
Trigonal Prismatic

The mixed-metal sulfate, KEu(SO4)2·H2O, has been obtained as a new polymorph using hydrothermal conditions. The crystal structure is isotypic with NaCe(SO4)2·H2O and shows a three-dimensional connectivity of the tetrahedral sulfate units with EuIII and KI ions. Tricapped trigonal–prismatic EuO9 units and square-antiprismatic KO8 units link the SO4 tetrahedra, building the three-dimensional structure. Topological analysis reveals the existence of two nodes with 6- and 10-connected nets. The compound was previously reported [Kazmierczak & Höppe (2010). J. Solid State Chem. 183, 2087–2094] in the monoclinic space group P21/c with a similar structural connectivity and coordination environments to the present compound.

Local Heat Transfer Characteristics in Simulated Electronic Modules

2003 ◽  
Vol 125 (3) ◽  
pp. 362-368 ◽  
Author(s):  
Seong-Yeon Yoo ◽  
Jong-Hark Park ◽  
Min-Ho Chung
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
Three Dimensional ◽  
Vortex Generator ◽  
Local Heat Transfer ◽  
Local Heat ◽  
Two Dimensional ◽  
Heat Transfer Characteristics ◽  
Dimensional Array ◽  
Transfer Characteristics

When heat is released by forced convection from electronic modules in a narrow printed circuit board channel, complex flow phenomena—such as stagnation and acceleration on the front surface, separation and reattachment on the top surface, wake or cavity flow near the rear surface—affect the heat transfer characteristics. The purpose of this study is to investigate how these flow conditions influence the local heat transfer from electronic modules. Experiments are performed on a three-dimensional array of hexahedral elements as well as on a two-dimensional array of rectangular elements. Naphthalene sublimation technique is employed to measure three-dimensional local mass transfer, and the mass transfer data are converted to their counterparts of the heat transfer process using the analogy equation between heat and mass transfer. Module location and streamwise module spacing are varied, and the effect of vortex generators on heat transfer enhancement is also examined. Dramatic change of local heat transfer coefficients is found on each surface of the module, and three-dimensional modules have a little higher heat transfer value than two-dimensional modules because of bypass flow. Longitudinal vortices formed by vortex generator enhance the mixing of fluids and thereby heat transfer, and the rectangular wing type vortex generator is found to be more effective than the delta wing type vortex generator.

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