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1.
The title compounds, (NH 4) 2[Mn II(edta)(H 2O)]·3H 2O (H 4edta = ethylenediamine-N,N,N′,N′-tetraacetic acid), (NH 4) 2[Mn II(cydta)(H 2O)]·4H 2O (H 4cydta = trans-1,2-cyclohexanediamine-N,N,N′,N′-tetraacetic acid) and K 2[Mn II(Hdtpa)]·3.5H 2O (H 5dtpa = diethylenetriamine-N,N,N′,N″,N″-pentaacetic acid), were prepared; their compositions and structures were determined
by elemental analysis and single-crystal X-ray diffraction technique. In these three complexes, the Mn 2+ ions are all seven-coordinated and have a pseudomonocapped trigonal prismatic configuration. All the three complexes crystallize
in triclinic system in P-1 space group. Crystal data: (NH 4) 2[Mn II(edta)(H 2O)]·3H 2O complex, a = 8.774(3) ?, b = 9.007(3) ?, c = 13.483(4) ?, α = 80.095(4)°, β = 80.708(4)°, γ = 68.770(4)°, V = 972.6(5) ? 3, Z = 2, D
c = 1.541 g/cm 3, μ = 0.745 mm −1, R = 0.033 and wR = 0.099 for 3406 observed reflections with I ≥ 2σ( I); (NH 4) 2[Mn II(cydta)(H 2O)]·4H 2O complex, a = 8.9720(18) ?, b = 9.4380(19) ?, c = 14.931(3) ?, α = 76.99(3)°, β = 83.27(3)°, γ = 75.62(3)°, V = 1190.8(4)? 3, Z = 2, D
c = 1.426 g/cm 3, μ = 0.625 mm −1, R = 0.061 and wR = 0.197 for 3240 observed reflections with I ≥ 2σ( I); K 2[Mn II(Hdtpa)]·3.5H 2O complex, a = 8.672(3) ?, b = 9.059(3) ?, c = 15.074(6) ?, α = 95.813(6)°, β = 96.665(6)°, γ = 99.212(6)°, V = 1152.4(7) ? 3, Z = 2, D
c = 1.687 g/cm 3, μ = 1.006 mm −1, R = 0.037 and wR = 0.090 for 4654 observed reflections with I ≥ 2σ( I).
Original Russian Text Copyright ? 2008 by X. F. Wang, J. Gao, J. Wang, Zh. H. Zhang, Y. F. Wang, L. J. Chen, W. Sun, and X.
D. Zhang
The text was submitted by the authors in English. Zhurnal Strukturnoi Khimii, Vol. 49, No. 4, pp. 753–759, July–August, 2008. 相似文献
2.
Two new Mn(II) coordination polymers formed with molecular formula [Mn(H 2O) 2(HBTC)·(H 2O)] 1 and [Mn(H 2O) 2(4,4′bipy)(HBTC) 2]·(H4,4′bipy) 2
2, where BTC = 1,2,4-benzenetricarboxylate and 4,4′bipy = 4,4′bipydine, have been synthesized via hydrothermal approach and
characterized by single crystal X-ray diffraction techniques. 1 is composed of Mn–H 2O–Mn 1D chains and further the chains are linked by HBTC ligands to form a 2D network in the ab plane; 2 is constructed by Mn–4,4′bipy–Mn 1D chains along the b direction with Mn 2+ ions coordinated to H 2BTC and water as terminal ligands to form a 2D network. We also prepared a third compound with the molecular formula of [Mn(H 2O)(HBTC)·(H 2O)] which has been recently structurally reported elsewhere. The magnetic properties of the three compounds have been studied
in detail under variable temperatures. 相似文献
3.
Six coordination compounds: [Li(H2O)4]+·hmta·Cl?, [Li(H2O)4]+·hmta·I?, [Na(H2O)4(hmta)]
2+2
·2H2O·2Br?, [Na(H2O)4(hmta)]
2+2
·2H2O·2I?, [K(H2O)(hmta)I]
n
and [Rb(H2O)(hmta)I]
n
, have been synthesized and characterised by IR spectroscopy, thermogravimetry coupled with differential thermal analysis, elemental analysis and X-ray crystallography. Both the sodium compounds are isostructural in a solid state, an isostructurality is also observed between compounds containing potassium and rubidium iodides. The sodium compounds exist as dimers (dinuclear core of the complex ion is created by two sodium cations and two water molecules). The molecules of potassium and rubidium compounds are assembled to the two dimensional hybrid nets. The each potentially multifunctional ligand (the hmta) exists in the outer coordination sphere in lithium compounds, acts in a monodentate mode in sodium compounds and in bidentate-bridging modes in potassium and rubidium compounds. The lithium ions are four coordinated, and the sodium, potassium and rubidium ions are six coordinated. Thermal analyses show that the investigated compounds decompose gradually with the formation of alkali metal halides which, during the further heating, are totally removed or they undergo partial decomposition to oxides. 相似文献
4.
Inclusion compounds of the macrocyclic cavitand cucurbit[8]uril (CB[8]) with the nickel( II) complex, { trans-[Ni(en) 2(H 2O) 2]@CB[8]}Cl 2 · 23.5H 2O, the copper( II) complex, {2[Cu(dien)(bipy)(H 2O)]@CB[8]}(ClO 4) 4 · 11H 2O, and the organic molecules, 2(pyCN)@CB[8]} · 16H 2O and {2(bpe)@CB[8]} · 17H 2O, where bipy is 4,4′-bipyridyl, pyCN is 4-cyanopyridine, and bpe is trans-1,2-bis(4-pyridyl)ethylene, were synthesized. The inclusion compounds with organic molecules were synthesized starting from
inclusion compounds of cucurbit[8]uril with cyclam and ethylenediamine complexes of copper( II) and nickel( II) by the guest exchange method, which is based on the replacement of one guest with another in the cavity of the cavitand
The resulting compounds were characterized by X-ray diffraction, ESR, 1H NMR, IR, and electronic absorption spectroscopy, and electrospray mass spectrometry. Photochemically induced [2+2]-cycloaddition
of two 1,2-bis(4-pyridyl)ethylene molecules included in cucurbit[8]uril was studied.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 1, pp. 25–34, January, 2006. 相似文献
5.
[Ni(dien) 2] 3[W 4S 4(CN) 12]·20H 2O and [Cu(dien)(Hdien)] 2[W 4S 4(CN) 12]·8H 2O were obtained by evaporating water-ammonia solutions containing K 6[W 4S 4(CN) 12]·2H 2O·2CH 3OH, diethylene triamine, and NiCl 2·6H 2O or CuCl 2·6H 2O. The crystals of the complex compounds were obtained within 3 days. The complex compounds were characterized by IR spectroscopy
and by XRD and elemental analysis. XRD data for the complex [Ni(dien) 2] 3[W 4S 4(CN) 12]·20H 2O are: triclinic system,
, a = 14.671(2) Å, b = 16.448(3) Å, c = 19.814(3) Å, α = 67.841(3)°, β = 68.996(3)°, γ = 67.527(3)°, V = 3961.6(11) Å 3, Z = 2; for the complex [Cu(dien)(Hdien)] 2[W 4S 4(CN) 12]·8H 2O: monoclinic system, C2/ c, a = 37.4290(1) Å, b = 17.7370(1) Å, c = 25.7370(2) Å, β = 105.3840(2)°, V = 16474.02(16) Å 3, Z = 12.
Original Russian Text Copyright ? 2005 by I. V. Kalinina, D. G. Samsonenko, Z. A. Starikova, A. A. Korlyukov, J. Lipkowski,
V. P. Fedin, and M. Yu. Antipin
__________
Translated from Zhurnal Strukturnoi Khimii, Vol. 46, No. 1, pp. 139–148, January–February, 2005. 相似文献
6.
The title complexes, K 2[Eu III(dtpa)(H 2O)]·5H 2O (H 5dtpa = diethylenetriamine-N,N,N′,N″,N″-pentaacetic acid), Na 2[Tb III(Httha)]·6H 2O (H 6ttha = triethylenetetramine-N,N,N′,N′,N″,N″-hexaacetic acid), were prepared, and their compositions and structures were determined
by elemental analyses and single-crystal X-ray diffraction techniques. The crystal of K 2[Eu III(dtpa)(H 2O)]·5H 2O belongs to triclinic crystal system and $
P\bar 1
$
P\bar 1
space group. The crystal data are as follows: a = 8.3540(17), b = 10.147(2), c = 15.059(3) α = 84.63(3)?, β = 82.02(3)°, γ = 83.96(3)°, V = 1253.1(4)? 3, Z = 2, R = 0.0325 and wR = 0.1013 for 4407 observed reflections with I ≥ 2σ( I). The [Eu III(dtpa)(H 2O)] 2− has a nine-coordinate pseudo-monocapped square antiprismatic structure, in which the nine coordinate atoms, three N and six
O are from one dtpa ligand and one water molecule. The crystal of the Na2[Tb III(Httha)]·6H 2O belongs to monoclinic system and P2 1/c space group. The crystal data are as follows: a = 10.3976(10), b = 12.7908(13), c = 23.199(2) ? = 90.914(2)°, V = 3084.9(5)? 3, Z = 4, R = 0.0309 and wR = 0.0704 for 5429 observed reflections with I ≥ 2σ( I). In the [Tb III(Httha)] 2−, the Tb 3+ ion is nine-coordinated yielding a pseudo-monocapped square antiprismatic conformation, in which the ttha ligand coordinates
to the central Tb 3+ ion with four N atoms and five O atoms. There is a free non-coordinate carboxyl group (−CH 2COOH) that can be modified by some biological molecules having target function. 相似文献
7.
Low-temperature heat capacities of a solid
complex Zn(Val)SO 4·H 2O( s) were measured by a precision automated adiabatic
calorimeter over the temperature range between 78 and 373 K. The initial dehydration
temperature of the coordination compound was determined to be, T
D=327.05
K, by analysis of the heat-capacity curve. The experimental values of molar
heat capacities were fitted to a polynomial equation of heat capacities ( C
p,m) with the reduced temperatures
( x), [ x= f ( T)], by least
square method. The polynomial fitted values of the molar heat capacities and
fundamental thermodynamic functions of the complex relative to the standard
reference temperature 298.15 K were given with the interval of 5 K.
Enthalpies of dissolution of the [ZnSO 4·7H 2O( s)+Val( s)] (Δ sol
H
m,l
0)
and the Zn(Val)SO 4·H 2O( s) (Δ sol
H
m,2
0) in 100.00 mL of 2 mol dm –3 HCl( aq) at T=298.15
K were determined to be, Δ sol
H
m,l
0=(94.588±0.025) kJ mol –1 and Δ sol
H
m,2
0=–(46.118±0.055)
kJ mol –1, by means of a homemade isoperibol
solution–reaction calorimeter. The standard molar enthalpy of formation
of the compound was determined as: Δ f
H
m
0
(Zn(Val)SO 4·H 2O( s), 298.15 K)=–(1850.97±1.92) kJ mol –1,
from the enthalpies of dissolution and other auxiliary thermodynamic data
through a Hess thermochemical cycle. Furthermore, the reliability of the Hess
thermochemical cycle was verified by comparing UV/Vis spectra and the refractive
indexes of solution A (from dissolution of the [ZnSO 4·7H 2O( s)+Val( s)] mixture
in 2 mol dm –3 hydrochloric acid) and solution
A’ (from dissolution of the complex Zn(Val)SO 4·H 2O( s) in 2 mol dm –3
hydrochloric acid). 相似文献
8.
New VO 2+, Mn 2+, Co 2+, Ni 2+ Cu 2+ and Zn 2+ complexes of 2,5-hexanedione bis(isonicotinylhydrazone) [H 2L] have been synthesized and characterized. The analyses confirmed the formulae: [VO(L)]·H 2O, [Mn 2(H 2L)Cl 2(H 2O) 6]Cl 2, [Co(L)(H 2O) 2]·2H 2O, [Ni(HL)(OAc)]·H 2O, [Cu(L)(H 2O) 2]·2H 2O, [Cu(L)]·2H 2O and [Zn(L)(H 2O) 2]. The formulae of [Ni(HL)(OAc)]·H 2O, [Zn(L)(H 2O) 2] and [Mn 2(H 2L)Cl 2(H 2O) 6]Cl 2, are supported by mass spectra. The molecular modeling of H 2L is drawn and showed intramolecular hydrogen bonding. The ligand releases two protons during reaction from the two amide groups (NHCO) and behaves as a binegative tetradentate (N 2O 2); good evidence comes from the 1H NMR spectrum of [Zn(L)(H 2O) 2]. The ligand has a buffering range 10–12 and p K's of 4.62, 7.78 and 9.45. The magnetic moments and electronic spectra of all complexes provide a square-planar for [Cu(L)]·2H 2O, square-pyramidal for [VO(L)]·H 2O and octahedral for the rest. The ESR spectra support the mononuclear geometry for [VO(L)]·H 2O and [Cu(L)(H 2O) 2]·2H 2O. The thermal decomposition of the complexes revealed the outer and inner solvents where the end product in most cases is metal oxide. 相似文献
9.
The complexes of 4-chloro-2-methoxybenzoic acid anion with Mn 2+,
Co 2+, Ni 2+, Cu 2+
and Zn 2+ were obtained as polycrystalline solids
with general formula M(C 8H 6ClO 3) 2· nH 2O and colours typical for M(II) ions (Mn – slightly pink, Co –
pink, Ni – slightly green, Cu – turquoise and Zn – white).
The results of elemental, thermal and spectral analyses suggest that compounds
of Mn(II), Cu(II) and Zn(II) are tetrahydrates whereas those of Co(II) and
Ni(II) are pentahydrates. The carboxylate groups in these complexes are monodentate.
The hydrates of 4-chloro-2-methoxybenzoates of Mn(II), Co(II), Ni(II), Cu(II)
and Zn(II) heated in air to 1273 K are dehydrated in one step in the range
of 323–411 K and form anhydrous salts which next in the range of 433–1212
K are decomposed to the following oxides: Mn 3O 4,
CoO, NiO and ZnO. The final products of decomposition of Cu(II) complex are
CuO and Cu. The solubility value in water at 293 K for all complexes is in
the order of 10 –3 mol dm –3.
The plots of χ M
vs.
temperature of 4-chloro-2-methoxybenzoates of Mn(II), Co(II), Ni(II) and Cu(II)
follow the Curie–Weiss law. The magnetic moment values of Mn 2+,
Co 2+, Ni 2+ and Cu 2+
ions in these complexes were determined in the range of 76−303 K and
they change from: 5.88–6.04 μ B for Mn(C 8H 6ClO 3) 2·4H 2O, 3.96–4.75
μ B for Co(C 8H 6ClO 3) 2·5H 2O, 2.32–3.02 μ B for Ni(C 8H 6ClO 3) 2·5H 2O and 1.77–1.94
μ B for Cu(C 8H 6ClO 3) 2·4H 2O. 相似文献
10.
Two new mono- and dinuclear Cu(II) complexes, namely [CuL 1]·0.5H 2O ( 1) and [(Cu 2(L 2) 2)(DMF)]·0.5DMF ( 2) (H 2L 1 = 1,2-bis{[( Z)-(3-methyl-5-oxo-1-phenyl-1 H-pyrazolidin-4(4 H)-yl)(phenyl)]methylene-aminooxy}ethane; H 2L 2 = 1,3-bis{[( Z)-(3-methyl-5-oxo-1-phenyl-1 H-pyrazolidin-4(4 H)-yl)(phenyl)] methyleneaminooxy}propane), have been synthesized and characterized by X-ray crystallography. The unit cell
of complex 1 contains two crystallographically independent but chemically identical [CuL 1] molecules and one crystalline water molecule, showing a slightly distorted square-planar coordination geometry and forming
a wave-like pattern running along the a-axis via hydrogen bonding and π···π stacking interactions. Complex 2 has a dinuclear structure, comprising two Cu(II) atoms, two completely deprotonated phenolate bisoxime (L 2) 2− moieties (in the form of enol), and both coordinated and hemi-crystalline DMF molecules. Complex 2 has square-planar and square-pyramidal geometries around the two copper centers, whose basic coordination planes are almost
perpendicular and form an infinite three-dimensional supramolecular network structure involving intermolecular C–H···N, C–H···O,
and C–H···π(Ph) hydrogen bonding and π···π stacking interactions of neighboring pyrazole rings. 相似文献
11.
The solid-state coordination reaction: Nd(NO 3) 3·6H 2O( s)+4Ala( s) → Nd(Ala) 4(NO 3) 3·H 2O( s)+5H 2O( l) and Er(NO 3) 3·6H 2O( s)+4Ala( s) → Er(Ala) 4(NO 3) 3·H 2O( s)+5H 2O( l) have been studied by classical solution calorimetry. The molar dissolution enthalpies of the reactants and the products
in 2 mol L –1 HCl solvent of
these two solid-solid coordination reactions have been measured using a calorimeter. From the results and other auxiliary
quantities, the standard molar formation enthalpies of [Nd(Ala) 4(NO 3) 3·H 2O, s, 298.2 K] and[Er(Ala) 4(NO 3) 3·H 2O, s,298.2 K] at 298.2 K have been determined to be Δ f
H
m
0 [Nd(Ala) 4(NO 3) 3·H 2O, s, 298.2 K]=–3867.2 kJ mol –1, and Δ f
H
m
0 [Er(Ala) 4(NO 3) 3·H 2O, s, 298.2 K]=–3821.5 kJ mol –1.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
12.
A two-dimensional network compound [Ce(DMF) 4(H 2O)][α-BW 12O 40]·H 2O·(HDMA) 2 (HDMA = protoned dimethylamine, DMF = N,N-dimethylformamide) was synthesized from α-H 5BW 12O 40· nH 2O, Ce(NO 3) 3·6H 2O and DMF and characterized by IR, UV spectra and TG-DTA. The result of the X-ray single crystal diffraction indicates that
the crystal is monoclinic, space group P2 1/n, with unit cell dimensional: a = 1.1983(3), b = 2.4216(5), c = 1.9517(4) nm, β = 92.91(3)°, Z = 4, R
1 = 0.07710, wR
2 = 0.1416. Structural analysis indicates that every [Ce(DMF) 4(H 2O)] 3+ building block is surrounded by three adjacent [α-BW 12O 40] 5− polyanions, meanwhile, every [α-BW 12O 40] 5− polyanion interconnects with three neighboring [Ce(DMF) 4(H 2O)] 3+ subunits, by making use of which two-dimensional network structure can be constructed. The result of thermogravimetric analysis
manifests that the title compound has two-stage weight loss and the decomposition temperature of the title polyanionic framework
is 560°C. The electrochemical analysis shows the title polyanion has three-step redox processes in the pH = 4–7 media. 相似文献
13.
The synthesis and thermal behavior of the new [Pd(fum)(bipy)]
n
·2 nH 2O ( 1), [Pd(fum)(bpe)]
n
· nH 2O ( 2) and [Pd(fum)(pz)]
n
·3 nH 2O ( 3) {bipy = 4,4′-bipyridine, bpe = 1,2-bis(4-pyridyl)ethene and pz = pyrazine} fumarate complexes are described in this work
as well their characterization by IR and 13C CPMAS NMR spectroscopies. TG curves showed that the compounds released organic ligands and lattice water molecules in the
temperature range of 46–491 °C. In all the cases, metallic palladium was identified as the final residue. 相似文献
14.
The compounds [Cu(pmda)(crea)]·H 2O ( 1 ), [Zn(pmda)(crea)]·H 2O ( 2 ) and [Co(pmda)(crea)(H 2O)]·H 2O ( 3 ) were prepared and characterized by thermal, spectral and X‐ray diffraction methods. In compounds 1 and 2 the M II coordination is of type 4+1 and approaches to a trigonal bipyramid (71.85 and 86.18 %, respectively) with rather linear N(pmda)‐M II‐N(crea) trans‐apical angles, but with different longest coordination bond (Cu‐O(pmda) or Zn‐N(apliphatic, pmda), respectively). Both compounds are isotypic and one intra‐molecular interligand N‐H···O interaction reinforces the molecular recogniton crea‐M II(pmda) chelate. In contrast, the compound 3 exhibits an octahedral coordination, imposed by the 3 d7 electronic configuration of the cobalt(II) atom, and the crea‐chelate recognition involves the Co‐N(crea) coordination bond and one intramolecular ‘bifurcated’ H‐bonding interaction between one N‐H(crea) bond and one O(pmda) plus the O(aqua) atoms as ‘acceptors’. 相似文献
15.
The reaction of Co(NO 3) 2·6H 2O with 1,3,5-benzenetricarboxylic acid (H 3btc, trimesic acid) in DMF at 100 °C afforded the coordination polymer [Co 3(dmf) 6(btc)(Hbtc)(H 2btc)]··9H 2O ( 1) (dmf is N,N′-dimethylformamide, DMF). According to the X-ray diffraction study, the metal-organic coordination polymer is composed of
planar honeycomb (6,3) networks, in which the organic benzenetricarboxylate anions and the inorganic Co 2+ cations play a role of three-connected nodes. Disordered water molecules are intercalated between the layers. A study of
the magnetic properties showed the presence of a weak antiferromagnetic coupling between the Co 2+ ions ( S = 3/2).
Dedicated to Academician G. A. Abakumov on the occasion of his 70th birthday.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1719–1723, September, 2007. 相似文献
16.
New cobalt trans-dioximate complexes with isoniconinamide have been synthesized: [Co II(DmgH) 2(Inia) 2] ( I), [Co III(DmgH) 2(Inia) 2][PF 6] · 1.5H 2O ( II), [Co III(NioxH) 2 (Inia) 2][PF 6] · H 2O · CH 3OH ( III), and [CoIIICl(DmgH) 2(Inia)] · H 2O ( IV), where DmgH − and NioxH − are the dimeth-ylglyoxime and 1,2-cyclohexanedionedioxime monoanions, respectively; Inia is the isonicotinamide molecule.
The structures of compounds I–IV have been determined by X-ray crystallography. In I–IV, Co(II) or Co(III) has an octahedral environment with the pseudomacrocyclic (DioxH −) 2 moiety (DioxH − is the dioximate monoanion) in the equatorial plane. The latter is stabilized by O-H…O hydrogen bonds. The isonicotinamide
molecules in all four complexes are monodentately bound to the metal ion through the heterocyclic nitrogen atom. 相似文献
17.
Two thiocyanato-Cu(II) complexes including mononuclear dithiocyanato Cu(Me 3dpt)(NCS) 2 ( 1) and the polymeric 1D [Cu( d, l-Ala)(μ N,S–NCS)(H 2O)]
n
( 2) were synthesized and structurally characterized (Me 3dpt = bis( N-methyl-3-propyl)methylamine, Ala = alaninate anion). The IR spectrum of complex 1 confirmed the N-bonding coordination mode of the thiocyanate groups, and its visible spectrum revealed the square pyramidal
geometry around the central Cu 2+ ion. Single X-ray crystallography of 1 showed that the Cu(II) center displays square pyramidal geometry with severe distortion toward trigonal bipyramidal environment . Complex 2 forms a 1-D polymeric chain with the NCS − acting as a μ N,S-ligand . A distorted SP geometry around the Cu 2+ centers was achieved by the O and N atoms of alaninato anion, the aqua ligand and by the N and S atoms of the bridging thiocyanate
groups. Hydrogen bonds of the type N–H···O, N–H···S and O–H···O are formed in this complex leading to the extension of the
1D chain to a supramolecular network. 相似文献
18.
The rare earth Schiff base complex Nd (H 2Salen) 2Cl 3·2C 2H 5OH was synthesized by a simple and convenient method and characterized by IR and elemental analysis. The catalyst system composed
of Nd (H 2Salen) 2Cl 3·2C 2H 5OH/Al( i-Bu) 3/CCl 4 is effective for the polymerization of styrene (St). The optimum conditions are as follows: [St]/[Nd] = 1000, [CCl 4]/[Nd] = 9, [Al]/[Nd] = 30, and polymerization at 50°C for 20 h. The resulting polystyrene was characterized by NMR and GPC.
The results of NMR show that the polymer obtained had a stereoregularity with 52.3% isotacticity and 47.7% syndiotacticity
without any random structure.
__________
Translated from Journal of Zhejiang University (Science Edition), 2007, 34(2): 189–196 [译自: 浙江大学学报(理学版)] 相似文献
19.
The reaction of trans-[Cr(Salen)(OH 2) 2] + with aqueous sulfite yields trans-[Cr(Salen)(OH 2)(OSO 2(SINGLEBOND)O)] − (O-bonded isomer). The rate and activation parameter data for the formation of the sulfito complex are consistent with a mechanism involving rate-limiting addition of SO 2 to the Cr III(SINGLEBOND)OH bond. The complex ions, trans-[(OH 2)Cr(Salen)(OSO 2(SINGLEBOND)O)] −, and trans-[(OH)Cr(Salen)(OSO 2(SINGLEBOND)O)] 2−, undergo reversible anation by NCS −, N 3−, imidazole, and pyridine resulting in the formation of trans-[XCr(Salen)(OSO 2(SINGLEBOND)O)] (N+1)−( n=1 for X=N 3−,NCS −, and 0 for X=imidazole and pyridine) predominantly via dissociative interchange mechanism. The labilizing action of the coordinated sulfite on the trans-Cr III-X bond in trans-[XCr(Salen)(OSO 2)] (n+1)− follows the sequence: NCS −pyridine ca. N 3− ca. imidazole. Data analysis indicated that the coordinated sulfite has little trans activating influence. © 1998 John Wiley & Sons, Inc. Int J Chem Kinet 30: 373–384, 1998 相似文献
20.
In this work, the title complexes, (EnH 2) 1.5[Er III(Ttha)] · 3H 2O ( I) and (EnH 2)[Er III(Egta)(H 2O)] 2 · 6H 2O ( II), where En = ethylenediamine, H 6Ttha = triethylenetetramine- N,N,N′,N″,N″’,N″′-hexaacetic acid, H 4Egta = ethyleneglycol-bis-(2-aminoethylether)- N,N,N′,N′-tetraacetic acid, have been successfully synthesized. Their structures have been characterized by IR spectroscopy and single-crystal
X-ray diffraction techniques. The X-ray diffraction reveals that I is nine-coordinated and crystallizes in the monoclinic crystal space group P2/ n with cell dimensions a = 17.6058(16), b = 9.6249(9), c = 20.560(2) ?, β = 109.7440(10)°, and V = 3279.1(5) ? 3. Compound II is also nine-coordinated and crystallizes in the monoclinic crystal space group P2 1/ n with the cell dimensions a = 12.938(6), b = 12.651(5), c = 14.943(6) ?, β = 105.441(5)°, and V = 2357.5(17) ? 3. In I, each EnH 22+ cation connects three adjacent [Er III(Egta)(H 2O)] − complex anions through hydrogen bonds, while in I, there are two types of EnH 2
2+ anions. One is highly symmetrical, forming hydrogen bonds with two neighboring [Er III(Ttha)] 3− complex anions. The other anion connects three adjacent [Er III(Ttha)] 3− complex anions through hydrogen bonds. These hydrogen bonds lead to the formation of 2D ladder-like layer structure. 相似文献
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