Relevant bibliographies by topics / Trigonal bipyramid

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Academic literature on the topic 'Trigonal bipyramid'

Author: Grafiati
Published: 4 June 2021
Last updated: 18 February 2022

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Journal articles on the topic "Trigonal bipyramid"

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Montgomery, Craig D., Steven J. Rettig, and Bryn Shurmer. "Crystal structure of the spirophosphorane (OCMe2C(O)O)2PH." Canadian Journal of Chemistry 76, no. 7 (July 1, 1998): 1060–63. http://dx.doi.org/10.1139/v98-108.

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The crystal structure of the spirobicyclic phosphorane (OCMe2C(O)O)2PH, 1, has been determined. Crystals of C8H13O6P, 1, are orthorhombic, a = 10.515(2), b = 10.623(2), c = 20.552(2) Å, Z = 8, space group Pca21. The structure was solved by direct methods and refined by full-matrix least-squares procedures to R = 0.037 (Rw = 0.033) for 1616 reflections with I > 3sigma(I). The structure consists of two independent molecules each displaying a distorted trigonal bipyramidal geometry; the distortion follows closely the Berry pseudorotation coordinate.Key words: crystal structure, phosphorane, Berry pseudorotation, trigonal bipyramid.
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Hou, Xiangyang, Xiao Wang, Xiangyu Liu, Jijiang Wang, Long Tang, and Ping Ju. "Fine-tuning the effects of auxiliary ligands on two trigonal-bipyramid cobalt(ii) complexes exhibiting field-induced slow magnetic relaxation." New Journal of Chemistry 42, no. 11 (2018): 8583–90. http://dx.doi.org/10.1039/c8nj01201f.

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Liang, Ji-Lei, Yu-Kun Lu, Jin-chong Zhao, Xue-Hui Li, Yuan Pan, Meng-Meng Wu, Yun-Qi Liu, and Chen-Guang Liu. "A novel POMos-based hybrid with penta-coordinated Mo in trigonal bipyramid: structure and an efficient precursor for hydrodesulfurization catalyst." RSC Adv. 4, no. 53 (2014): 27787–90. http://dx.doi.org/10.1039/c4ra02696a.

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Ndiaye, Mamadou, Abdoulaye Samb, Libasse Diop, and Thierry Maris. "Crystal structure ofcatena-poly[N,N,N′,N′-tetramethylguanidinium [(chloridocadmate)-di-μ-chlorido]]." Acta Crystallographica Section E Crystallographic Communications 72, no. 1 (January 1, 2016): 1–3. http://dx.doi.org/10.1107/s2056989015020836.

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In the structure of the title salt, {(C5H14N3)[CdCl3]}n, the CdIIatom of the complex anion is five-coordinated by one terminal and four bridging Cl atoms. The corresponding coordination polyhedron is a distorted trigonal bipyramid, with Cd—Cl distances in the range 2.4829 (4)–2.6402 (4) Å. The bipyramids are condensed into a polyanionic zigzag chain extending parallel to [101]. The tetramethylguanidinium cations are situated between the polyanionic chains and are linked to them through N—H...Cl hydrogen bonds, forming a layered network parallel to (010).
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Sun, Su-Wen, and Lei Jin. "A novel pentacoordinated cadmium compound:catena-poly[benzyltriethylammonium [[chloridocadmate(II)]-di-μ-chlorido]]." Acta Crystallographica Section C Crystal Structure Communications 69, no. 9 (August 21, 2013): 1030–33. http://dx.doi.org/10.1107/s010827011302221x.

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The structure of the title one-dimensionalABX3-type organic–inorganic hybrid complex, {(C13H22N)[CdCl3]}n, consists of benzyltriethylammonium cations and one-dimensional anionic {[CdCl3]−}nchains, in which the CdIIcentres are in an unusual two-layer five-coordinated arrangement. The CdIIatom is pentacoordinated by four bridging and one terminal chloride ligand, forming a slightly distorted trigonal bipyramidal ClCd(μ-Cl)4arrangement. The trigonal bipyramid is linked by two opposite shared faces, giving rise to a zigzag linear anionic {[CdCl3]−}nchain. The benzyltriethylammonium cations are located in the inter-space of the inorganic network. There are C—H...Cl hydrogen bonds present and these play a crucial role in linking the organic cations and inorganic layers, and also help assemble the components into a three-dimensional network.
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Xue, Ying-ying, and Yi-hong Ding. "New global minima of 6-vertex dicarboranes: classical but unexpected." Chemical Communications 55, no. 45 (2019): 6373–76. http://dx.doi.org/10.1039/c9cc02557j.

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Choe, Song-Hyok, Chol-Jun Yu, Kum-Chol Ri, Jing-Song Kim, Un-Gi Jong, Yun-Hyok Kye, and Song-Nam Hong. "First-principles study of NaxTiO2 with trigonal bipyramid structures: an insight into sodium-ion battery anode applications." Physical Chemistry Chemical Physics 21, no. 16 (2019): 8408–17. http://dx.doi.org/10.1039/c9cp00267g.

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Müller, Gerhard, and Ulrich Jürgen Bildmann. "Crystal and Molecular Structure of P(C6H5)5 · 0.5 THF." Zeitschrift für Naturforschung B 59, no. 11-12 (December 1, 2004): 1411–14. http://dx.doi.org/10.1515/znb-2004-11-1207.

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Pentaphenylphosphorus crystallizes from tetrahydrofuran (THF) as P(C6H5)5・0.5 THF (triclinic space group: P1̅, a = 10.095(4), b = 10.252(3), c = 12.725(3) A° , α = 71.21(1), β = 76.98(3), γ = 87.12(1)°, Z = 2). Its molecular structure is an almost perfect trigonal bipyramid with significantly longer axial than equatorial P-CPh bonds (P-Cax 1.982(2)/1.979(2), P-Ceq 1.853(2)/1.845(2)/1.847(2) Å). It differs from the well established structure of solvent-free P(C6H5)5 (P. J. Wheatley, J. Chem. Soc. 2206 (1964)) in the relative orientation of the phenyl rings with respect to each other (axial rings) and with respect to the equatorial PC3 plane (equatorial rings) but not in the trigonal-bipyramidal (tbp) geometry at phosphorus. Differences in the geometry around the central atom had been found previously for Sb(C6H5)5 (square pyramid) and Sb(C6H5)5 · 0.5C6H12 (tbp) but not in As(C6H5)5 and As(C6H5)5 · 0.5 C6H12 (both tbp).
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Körner, Volkmar, Alexander Asam, Gottfried Hüttner, Laszlo Zsolnai, and Michael Büchner. "Fünffach koordinierte Komplexe vom Typ [tripodM-(ortho-(X)(Y)C6H4)]n (X, Y = O, S) bei d5-, d6- und d7-systemen. synthese, struktur, elektrochemie und esr-spektren / Five-coordinate complexes [tripodM-(ortho-(X)(Y)C6H4)]n (X, Y = O, S) with d5-,d6- and d7-Systems. Synthesis, Structure, Electrochemistry and ESR-Spectra." Zeitschrift für Naturforschung B 49, no. 9 (September 1, 1994): 1183–92. http://dx.doi.org/10.1515/znb-1994-0906.

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The d6-Co(III)-species [tripodCo-(ortho-(X)(Y)C6H4)]+ (X, Y = O, S, tripod = CH3C(CH2PPh2)3) 1 are reversibly reduced to the neutral d7-Co(II)-compounds [tripodCo-(ortho-(X)(Y)C6H4)] (X, Y = O, S) 2. Both species show fivefold coordination of cobalt with coordination polyhedra in between the limits of the square pyramid and the trigonal bipyramid respectively. The low-spin d7-species 2 give clearly resolved ESR-spectra revealing the coexistence of two geometric isomers above -80 °C, with only one isomer persistent at temperatures around 100 K.As an analogous d5-system [benzyltripodFe-(ortho-(S)(S)C6H4)]+ 3 (benzyltripod = C6H5CH2C(CH2PPh2)3) has been obtained from [benzyltripodFe(NCCH3)3]2+ and C6H6S2. Alternatively complexes of this type, e.g. [tripodFe-(ortho-(S)(S)C6H4)]+ 4, may be prepared from Fe(H2O)6(BF4)2/tripod/C6H6S2 when the reaction mixture is activated by acidification with HBF4. The geometry of the d5-species 3 and 4 is close to a trigonal bipyramid
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Kim, Hyojin, Sunhwi Eom, Sora Park, Dong Won Kang, Mengmeng Wang, Youngseo Kim, Sungnam Park, Wei Shi, and Chang Seop Hong. "Structure, photoluminescence, and magnetic properties of a Mn(ii)-based metal–organic framework." New Journal of Chemistry 44, no. 43 (2020): 18694–702. http://dx.doi.org/10.1039/d0nj04193a.

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Fluorescence of a three-dimensional Mn-based framework compound is completely quenched by nitroaromatic compounds and Cu2+ ions. Spin canting is operative in this Mn(ii) system, resulting from the magnetic anisotropy of the Mn(ii) ion in a low-symmetry trigonal bipyramid.
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Dissertations / Theses on the topic "Trigonal bipyramid"

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O'Connor, Helen. "The use of acetylacetonate-based paramagnetic metalloligands in the construction of supramolecular magnetic coordination capsules." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/29547.

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In molecular magnetism, rational design and serendipity have played complementary roles in the synthesis of complexes which display a breadth of interesting physical characteristics. These range from the basic understanding of magneto‐structural correlations, to more complicated phenomena such as slow relaxation of the magnetisation, spin frustration effects, and tuning magnetic interactions with a view to spintronics. The inherent physical properties of these complexes has already afforded molecules which can behave as single‐molecule magnets, singlechain magnets, single‐ion magnets, magnetic metal‐organic frameworks, magnetic refrigerants, and molecular qubits. Even when the building blocks are well known, the rational design of magnetic clusters can be extremely difficult, with the shape and nuclearity often dominated by several internal and external factors. Metallosupramolecular processes proffer an attractive strategy to the rational design of these clusters by making use of structurally‐rigid precursors which, when combined in the correct stoichiometric ratio, can be used to construct various predefined discrete two‐ and three‐dimensional polygons and polyhedra. In particular, the use of metalloligands as structurally‐rigid precursors is appealing, not only because of their often‐straightforward synthesis, but because of their ability to be easily modified in order to create comparable building blocks with different chemical and physical properties. It is therefore surprising that there are limited examples of magnetic architectures built through this approach. Each chapter of this thesis aims to exploit the use of acetylacetonate‐based paramagnetic metalloligands for the synthesis of structurally analogous magnetic coordination capsules, with inherently different magnetic properties. Chapter 2 describes the structural and magnetic studies of fourteen tetradecanuclear coordination cubes, synthesised using the paramagnetic metalloligand [MIIIL3] (MIII = Cr, Fe; HL = 1‐(4‐pyridyl)butane‐1,3‐dione). The heterometallic [MIII8MII6L24]n+ (MII = Co, Ni, Cu, and Pd; n = 0‐ 12) cubes formed from the reaction of [MIIIL3] and a “naked” MII salt are all topologically similar, with the MIII ions occupying the corners of the cubes and the MII ions occupying the faces. Excluding the PdII‐based cube, all of the complexes display magnetic exchange interactions at low temperatures. Due to the enormous size of these clusters and their resulting matrices, the magnetic fitting was done using the process of statistical spectroscopy. Chapter 3 describes the structural and magnetic studies of five [MIII2MII3L6]n+ (MIII = Cr, Fe, and Al; MII = Co, Zn, and Pd; HL = 1‐(4‐pyridyl)butane‐1,3‐dione; n = 0‐6) trigonal bipyramids, built using the diamagnetic and paramagnetic metalloligands [MIIIL3]. [FeIII2CoII3L6Cl6] represents the first magnetic trigonal bipyramid synthesised through the pyridyl‐based metalloligand approach. SQUID magnetometry studies show a weak antiferromagnetic exchange interactions between the FeIII and CoII ions, while EPR spectroscopy measurements demonstrate a small increase in the zero‐field splitting parameter of the FeIII ion upon coordination of [FeIIIL3] to a MII ion. Complete active space self‐consistent field (CASSCF) calculations show the axial zero‐field splitting parameter of CoII to be ≈‐14 cm‐1, which is consistent with the magnetothermal and spectroscopic data. Chapter 4 describes the synthesis and characterisation of six magnetic trigonal bipyramids, synthesised through dynamic covalent reactions of the metalloligand [FeIIILNH23] (HLNH2 = 1‐(4‐ aminophenyl)butane‐1,3‐dione) with either a dialdehyde or diacyl dichloride. The three [FeIII2MII3Lim3]n+ (MII = Co, Ni; n = 0‐6) imine‐based cages are formed from the reaction of the metalloligand with 2,6‐pyridinedicarboxaldehyde in the presence of a templating MII salt and a catalytic amount of acid, whereas the three [FeIII2Lam3] amide‐based cages are formed from the reaction of the metalloligand with isophthaloyl chloride in the presence of a base. The [FeIII2NiII3Lim3]n+ trigonal bipyramid displays weak antiferromagnetic interactions between FeIII and NiII ions, with JFe‐Ni = ‐0.12 cm‐1 and DNi = 8.93 cm‐1, while the [FeIII2Lam3] amide‐based cages display interesting configurational features dominated by the enthalpic gain from a series of intermolecular interactions.
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Funck, Kristen Elise. "Magnetic Properties and Reactivity Studies of Families of Trigonal Bipyramidal Cyanide Clusters and Their Extended Structures." Thesis, 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-9002.

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Ferric ferrocyanide (Prussian blue) and its analogues are renowned for the variety of properties and applications associated with them. At the same time, however, they suffer from issues related to their variable composition and poor crystallinity. As a result, we are preparing discrete cyanide-bridged clusters both to mimic these materials and to search for properties unique to the molecule, such as single molecule magnetism. The work in this dissertation has focused on the expansion of series of trigonal bipyramidal (TBP) cyanide-bridged clusters, [M(tmphen)2]3[M′(CN)6]2, that exhibit a variety of properties including spin crossover, charge-transfer-induced spin transition, and photomagnetism. One goal of the work was focused on the preparation of new paramagnetic TBP clusters incorporating various 3d metal ion combinations. Nine new clusters were prepared and characterized, including several “model compounds” with only one type of paramagnetic metal ion. The magnetic properties of these model compounds were combined to better explain the coupling through the cyanide ligands in clusters with two paramagnetic metal centers. An additional two clusters were also prepared that were found to exhibit a thermally induced LS Fe^II -> HS Fe^II transition. The spin crossover event was confirmed by magnetic susceptibility and Mössbauer spectroscopy, and variable temperature X-ray crystallography revealed the transitions to be distinct for each FeII center and dependant on the interstitial solvent. Another major goal of the work was to investigate the TBP clusters for their potential to be used as building-blocks to prepare 1-D extended structures of linked clusters, such as a {[Co(tmphen)2]3[Fe(CN)6]2[Mn(MeOH)4]}∞(ClO4)3 chain. A final research goal was a search for photomagnetic behavior, the change in magnetic properties with irradiation, related to spin transitions in several key TBP clusters. The Fe3Fe2 and Fe3Co2 TBP clusters were found to exhibit a light-induced excited spin state trapping (the LIESST effect) similar to that observed in mononuclear FeII compounds, and the photo-induced charge transfer that has been observed in Co-Fe Prussian blue materials is mimicked by the Co3Fe2 TBP molecular analogue.
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Liu, Wen-Chi, and 劉玟季. "Formation of Trigonal Bipyramidal Copper(III) Complexes with PS3′ Ligand." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/01290583538778035573.

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碩士
國立臺灣師範大學
化學系
103
Formation of copper(III) complexes is of great importance for the understanding of dioxygen cleavage in enzymatic systems. However, there are only few examples of structurally characterized mononuclear CuIII complexes, most of them possessing square-planar geometry. The tripodal tetradentate ligand P(C6H3-3-SiMe3-2-SH)3 (H3PS3′) was deprotonated by NaH, and further reacted with CuCl2 in MeCN/THF mixed solvent. The disproportionation of copper(II) species occurred to form [PPN][PS3′CuCl] (1) and [PPN][CuCl2]. The X-ray structure, X-ray absorption spectrum and NMR spectra of 1 unambiguously indicate that complex 1 is a diamagnetic copper(III) species with a trigonal bipyramidal geometry. Cyclic voltammogram analysis of 1 shows irreversible redox waves in either MeCN or CH2Cl2 revealing that complex 1 is an electrochemically unstable species. Based on yield analysis for the formation of 1 under different conditions, we propose that disproportionation of copper(II) species occurs through an inner-sphere electron transfer as dimeric copper(II) species encounters deprotonated PS3′3− ligand. The dimeric copper(II) species will be regenerated from resulting copper(I), [PPN][CuCl2], by O2 oxidation. This study provides useful insight for further understanding the characteristic of the five-coordination trigonal bipyramidal copper(III) complexes.
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Chang, Ya-Fan, and 張雅帆. "Synthesis Mechanism and Replacement Study of Trigonal Bipyramidal Copper(III) Phosphineimine Complex." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/05166382720310669647.

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碩士
國立臺灣師範大學
化學系
104
A trigonal bipyramidal copper(III) complex, [PPN][(TMSPS3)CuIII(NCBH3)] (2), an analogue of [PPN][(TMSPS3)CuIII(NCCH3)], was synthesized from the reaction of [PPN][(TMSPS3)CuIII(Cl)] (1) with sodium cyanoborohydride (NaBH3CN) in THF. Interestingly, complex 1 was converted to (TMSPS3)CuIII(NH=PPh3) (3) in THF as NaOMe was added. The added NaOMe is proposed to react with trace of water in THF solution to produce OH- anion. Then, the in-situ produced OH- anion attacks [PPN]+, and generates O=PPh3 and NH=PPh3. Further, NH=PPh3 coordinates to the copper(III) center to form the five-coordinate copper(III) complex. UV-vis titration of 3 by adding N3- (Keq = 0.25) or DABCO (Keq = 0.15) complies 1:1 ligand exchange in solution. This result demonstrates that the binding ability of NH=PPh3 ligand is strong than that of DABCO and N3-. This finding is related to basicity and donor capacity of the axial ligand.
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Chang, Hao-Ching, and 張皓晴. "Electronic Structure and Reactivity of Trigonal Bipyramidal Copper(III) Complexes with an Exchangeable Axial Ligand." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/83660685394242053568.

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博士
國立臺灣師範大學
化學系
104
A trigonal bipyramidal copper(III) complex, [PPN][Cu(TMSPS3)(Cl)] (complex 1), was synthesized following our previous studies. Basing on the correlation between yields and preparation conditions as well as DFT calculations, we propose a thermodynamically favored copper(II) disproportionation occurs within a TMSPS3–Cu2Cl4 intermediate, producing complex 1 and a copper(I) side-product. UV–vis titrations of complex 1 with various additive ligands, such as N3− (Keq = 18), DABCO (8), pyridine (0.13) and 2,6-lutidine (0.0010), comply 1:1 ligand–chloride exchange in solution, hence clarifying the semi-stability of complex 1 in solution phase. Derivatized [PPN][Cu(TMSPS3)(N3)] (complex 2), [Cu(TMSPS3)(DABCO)] (complex 3) and [PPN][Cu(TMSPS3)(NCS/Cl)] (complex 4/1) were then accordingly synthesized. Cu and S K-edge X-ray absorption spectra of complexes 1–3 reveal the elevated LUMO (3dz2 feathered) in TBP ligand field with their +3 oxidation state of copper and the Cu–thiolate covalency. These indicate the electron density compensation (S→Cu) within Cu(TMSPS3) moiety, which not only stabilizes copper(III) center but also supresses the electrostatic demand for the axial ligand binding. A cyano derivative, [PPN][Cu(TMSPS3)(CN)] (complex 5), was isolated from the reaction of complex 1 with NaOH in CH3CN; and a cyanomethide-bound copper(III) intermediate is evidenced by NMR, UV–vis, and IR spectra, responsible for the C–CN bond cleavage of CH3CN solvent. Additionally, chloride of complex 1 is abstracted by Sc(OTf)3, which exposes the copper(III) moiety and leads the formation of dimeric [Cu(TMSPS3)]2 (complex 6). These results facilitate further development of high-valent copper catalysts.
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Saber, Mohamed Rashad Mohamed. "Enhancing Magnetic Properties of Molecular Magnetic Materials: The Role of Single-Ion Anisotropy." Thesis, 2013. http://hdl.handle.net/1969.1/151184.

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Considerable efforts are being devoted to designing enhanced molecular magnetic materials, in particular single molecule magnets (SMMs) that can meet the requirements for future technologies such as quantum computing and spintronics. A current trend in the field is enhancing the global anisotropy in metal complexes using single-ion anisotropy. The work in this dissertation is devoted to the synthesis and characterization of new building blocks of the highly anisotropic early transition metal ion V(III) with the aim of incorporating them into heterometallic molecular materials. The results underscore the importance of tuning the local coordination environments of metal ions in order to ensure enhanced single ion anisotropy. A family of mononuclear axially distorted vanadium (III) compounds, A[L_(3)VX_(3)] (3-9) (X = F, Cl or Br, A^(+) = Et_(4)N^(+), nBu_(4)N^(+) or PPN^(+) , L_(3) = Tp or Tp* (Tp = tris(-1-pyrazolyl)borohydride), Tp* = tris(3,5-dimethyl-1-pyrazolyl)borohydride)), and [Tp*V(DMF)_(3)](PF_(6))_(2) were studied. Replacement of the Tp ligand in 3 with the stronger π-donor Tp* results in a near doubling of the magnitude of the axial zero-field splitting parameter D_(z) (D_(z) = -16.0 cm^(-1) in 3, and -30.0 cm^(-1) in 4) as determined by magnetic measurements. Such findings support the idea that controlling the axial crystal field distortion is an excellent way to enhance single-ion anisotropy. High Field-High Frequency EPR measurements on 4 revealed an even higher D value, -40.0 cm^(-1). Interestingly, compound 4 exhibits evidence for an out-of-phase ac signal under dc field. In another effort, a new series of vanadium cyanide building blocks, PPN[V(acac)_(2)(CN)_(2)]∙PPNCl (13) (acac = acetylacetonate), A[V(L)(CN)_(2)] (A^(+) = Et_(4)N^(+), L = N,N'-Ethylenebis(salicylimine) (14), A = PPN^(+), L = N,N'-Ethylenebis(salicylimine) (15), L = N,N'-Phenylenebis(salicylimine) (16), and L = N,N'-Ethylenebis(2-methoxysalicylimine) (17)) were synthesized. Magnetic studies revealed moderate Dz values (-10.0, 5.89, 3.7, 4.05 and 4.36 cm^(-1) for 13-17 respectively). The first family of cyanide-bridged lanthanide containing molecules with a trigonal bipyramidal (TBP) geometry, (Et_(4)N)_(2)[(Re(triphos)(CN)_(3))_(2)(Ln(NO_(3))_(3))_(3)]-∙4CH_(3)CN (19-27 with Ln = La, Ce, Pr, Nd, Sm, Gd, Tb, Dy and Ho) were prepared using the [(triphos)Re(CN)_(3)]^(-) building block, results that add valuable information to our database of compounds with a TBP geometry. Magnetic studies revealed diverse magnetic responses including slow relaxation of the magnetization at zero field for 25 and 26 , an indication of SMM behavior.
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Book chapters on the topic "Trigonal bipyramid"

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Tole, Philip, and Carmay Lim. "Do Stereoelectronic Effects Control the Structure and Reactivity of Trigonal-Bipyramidal Phosphoesters?" In ACS Symposium Series, 240–55. Washington, DC: American Chemical Society, 1993. http://dx.doi.org/10.1021/bk-1993-0539.ch013.

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"Molecular Geometries, Hybridizations and Polarities." In Computer Based Projects for a Chemistry Curriculum, edited by Thomas J. Manning and Aurora P. Gramatges, 48–57. BENTHAM SCIENCE PUBLISHERS, 2013. http://dx.doi.org/10.2174/9781608051939113010009.

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In this exercise, the basics of Valence Shell Electron Pair Repulsion (VSEPR) will be reviewed and the structures constructed using this approach will be visualized in three dimensions. Students will build molecules with geometries such as linear, trigonal planar, tetrahedral, trigonal bipyramidal, square planar, and octahedral. Students will identify the hybridizations of the various molecules constructed in the molecular modeling program. Students will utilize semiempirical methods to calculate the dipole moments of the molecular species constructed.
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"4.8 Trigonal Bipyramidal Lewis Base Adducts of Methyltrioxorhenium(VII)." In Transition Metals Part 3, edited by Wolfgang A. Hellmann. Stuttgart: Georg Thieme Verlag, 2000. http://dx.doi.org/10.1055/b-0035-108489.

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