Trigonal bipyramidal environment

Zinc dithiocarbamates have been used for many years as antioxidants/antiabrasives in motor oils and as vulcanization accelerators in rubber. The crystal structure of bis[A, A-di- -propyldithio-carbamato]zinc shows identical coordination of the two zinc atoms by five sulfur donors in a trigonal-bipyramidal environment with a zinc-zinc distance of 3.786 A.5 5 The electrochemistry of a range of dialkylthiocarbamate zinc complexes was studied at platinum and mercury electrodes. An exchange reaction was observed with mercury of the electrode.556 Different structural types have been identified by variation of the nitrogen donor in the pyridine and N,N,N, N -tetra-methylenediamine adducts of bis[7V,7V-di- .vo-propyldithiocarbamato]zinc. The pyridine shows a 1 1 complex and the TMEDA gives an unusual bridging coordination mode.557 The anionic complexes of zinc tris( V, V-dialkyldithiocarbamates) can be synthesized and have been spectroscopically characterized.558... 

The reaction of Me2InCl with phenylhydrazine yielded [PhN(H)NH2]2[Me2InCl]4 233.1S1 Compound 233 shows both types of electronic stabilization (dimerization and adduct formation) since it consists of a chain of four Cl-bridged Me2InCl units, in which the terminal ones each coordinate to one hydrazine donor. The In atoms each adopt a trigonal-bipyramidal environment. 

While for silyl and germyl cation complexes tetracoordination of the element prevails, stannyl cations favor pentacoordination. That is, the trigonal-bipyramidal environment of the Sn atom in the diwater complex of the stannylium ion Me3Sn ... 

Nitriloacetic acid reacts with vanadium-(m). -(iv), or -(v) oxides to form oxovanadatranetrionic acid (38). The crystal structure of [VO(CjQHgNO)2] (CjgHgNOH = 2-methyl-8-quinolinol) has shown that the vanadium atom has a five-co-ordinate trigonal-bipyramidal environment, with three oxygen atoms in the equatorial plane and the two nitrogen atoms of the bidentate ligand in the apical positions. The optimum conditions for the formation of a 1 2 2 vanadium(iv)-morin-4-aminoantipyrine system have been described as pH 5, a tenfold excess of morin (39), and a 3300-fold excess of 4-amino-antipyrine. ... 

X-ray diffraction study of the HMPT adduct of a cyclic organotin dithiophosphinate, 5,5-dimethyl-2-phenyl-l,5,2-thiastannaphospholane-2-thione (313) has shown that the tin atom has a trigonal bipyramidal environment with a HMPT molecule and sulfur atom in axial positions <86JOM(309)273>. The Structure of l,3-di-rcrt-butyl-2,4,4-trimethyl-l,3,4,2-diazastannaborolidine (314) was studied by x-ray diffraction <87JOM(326)307>. 

Our first study of these systems was the synthesis in 1998 of the polymeric complex [ 1( 6 5)2( )2] through the reaction between triphenylphosphine oxide, thallium nitrate and lithium bis(pentafluorophenyl)aurate(I) [71]. This complex consisted of an extended unsupported linear chain of alternate gold and thallium centers. These atoms displayed Au-Tl interactions of 3.0358(8) and 3.0862(8) A, and the thallium atoms showed a distorted pseudo-trigonal-bipyramidal environment, taking into account the stereochemically active inert pair of this atom. As described below, the environment around thallium is one of the main factors that affects the optical properties of these mixed systems. 

The first cyclopnict(V)azane, reported by Roesky and coworkers in 1983, was the arsenic compound 33, obtained by oxidative addition of CI2 and concomitant trimethyl(chloro)-silane elimination from a bis(trimethylsilyl)amidoAs(III) precursor. Equation (10.11). Each As atom in crystalline 33 is in a trigonal bipyramidal environment (Cl and axial) there is a rhomboidal (AsN)2 core, with the As—longer than the As-Neq bonds [a feature which is replicated in the (Sb N)2 compounds 34, 35, and 36, but differs from the (M N)2 compounds of Section 10.3.1]. Thermolysis of 33 yielded the crystalline compounds [As(CF3)2(p-N)] ,. (v = 3 or 4). ... 

How will the d orbitals split in a trigonal bipyramidal environment Using a crystal field (pure point charge) model, determine what the relative energies of the orbitals will be. 

Relevant structural features of the S02 complexes are collected in Table 16 together with the IR absorption frequency of SO2. In complex (63) the nickel atom is in a distorted trigonal bipyramidal environment,250 with a bent coordinated S02 molecule, while in [Ni(p3)(S02)] (64) S02 is coplanar with nickel which achieves a distorted pseudotetrahedral structure. 

The crystal structure of [Ir(CO)(diphos)2]+ has been determined. The iridium atom is in a distorted trigonal bipyramidal environment (150). 

The structure of this compound was determined. The tellurium atom is in a distorted trigonal-bipyramidal environment with the oxygen atoms in the axial positions and the two sulfur atoms and the tellurium lone electron pair in the equatorial positions2. 

While for silyl and germyl cation complexes tetracoordination of the element prevails, stannyl cations favor pentacoordination. That is, the trigonal-bipyramidal environment of the Sn atom in the diwater complex of the stannylium ion Me3Sn + [Me3Sn(H20)2]+ 84178 has its counterpart in the tetrahedral structure of the pro-tonated silanol 85.116 The structure of the bis(acetonitrile)tricyclohexyltin hexa-fluoroantimonate 86 SbF6179 reveals pentacoordination for the tin atom,180 while all... 

The ESR spectrum of the Cu —Zn heterodinuclear complex gave the well-defined ESR parameters (gy = 2.10, gJ. = 2.24,14 l = 117 G, and IA LI = 124 G), which indicate that the Cu(ll) ion in the complex has a trigonal-bipyramidal environment and a ground state (154). The observation of well-defined ESR spectmm also confirms that the complex retains its imidazolate-bridged Cu —Zn heterodinuclear structure and that it is not a 1 1 mixture of Cu —Cu and Zn Zn homodinuclear complexes. 

Some nitrosyl complex compounds have been prepared in which the vanadium center is formally V(I). They carry the triethanolamine (tea) coligand and the vanadium in a stracturally characterized example, [V(NO)(tea)] , is in a distorted, trigonal-bipyramidal environment with the amine and nitrosyl nitrogen donors in the axial... 

Phenylazo)phenyl tellurium acetate was prepared from the aryl tellurium chloride and sodium acetate. The tellurium atom is in a trigonal bipyramidal environment with the oxygen and one nitrogen atom in the two axial positions. ... 

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