共查询到20条相似文献,搜索用时 15 毫秒
1.
João C. Dias 《Inorganica chimica acta》2009,362(6):2076-2079
Compounds FeIII(3-CH3O-qsal)2PF6 · nH2O (n = 0, 2) (1, 1 · 2H2O) were synthesized and characterized: the structure of 1 and the magnetic properties of both compounds were determined. Compound 1 · 2H2O presents properties characteristic of high-spin Fe(III), while 1 presents properties of low-spin Fe(III) with an onset of a gradual spin crossover at ca. 300 K. 相似文献
2.
《Inorganica chimica acta》2004,357(8):2324-2330
The reactions of Me(Ph)SnCl2 and Et(Ph)SnCl2 with 2,6-diacetylpyridine bis(thiosemicarbazone) (H2DAPTSC) afforded the complexes [Me(Ph)Sn(HDAPTSC)]Cl · 1.25MeOH (1) and [Et(Ph)Sn(H2DAPTSC)]Cl2 · MeOH · H2O (2), respectively. Single-crystal X-ray crystallography showed that in both complexes the ligand, monodeprotonated in 1 and neutral in 2, is S(1),S(2),N(3),N(4),N(5)-coordinated, and the coordination geometry around the metal can be described as a distorted pentagonal bipyramid with the aryl and alkyl groups in axial positions. 1H and 119Sn NMR studies of solution in DMSO suggest that 2 dissociates completely in this solvent, while 1 evolves to the new complex [Me(Ph)Sn(DAPTSC)], with release of H2DAPTSC and Me(Ph)SnCl2. These conclusions were also supported by conductivity measurements. 相似文献
3.
Two new tetrahedral tungsten cyanide cluster compounds, [Cu(dien)]3[W4Te4(CN)12] · 9H2O (1) (dien=diethylenetriamine) and [Ni(en)(NH3)]3[W4Se4(CN)12] · 7.5H2O (2) (en=ethylenediamine), were synthesized by treating aqueous solutions of the saltlike cluster compound K6[W4Te4(CN)12] · 5H2O/K6[W4Se4(CN)12] · 6H2O with copper(II)/nickel(II) chloride in aqueous ammonia containing dien/en. The cyano-bridged layered coordination polymeric compounds were characterized by single-crystal X-ray diffraction analysis: monoclinic, space group P21 for 1; trigonal, space group for 2. Structures of 1 and 2 consist of infinite neutral layers of cluster components {W4Te4(CN)12}/{W4Se4(CN)12} connected, one another by {Cu(dien)} or {Ni(en)(NH3)} fragments, respectively. 相似文献
4.
M. Carla Aragoni Francesco Demartin Alessandra Garau Vito Lippolis Silvia Rizzato 《Inorganica chimica acta》2004,357(12):3803-3809
The compounds [Ni(L)(MeCN)]I8 (1) and [Ni(L)(MeCN)]I12 (2) have been obtained from the reactions of the complexes [Ni(L)(L′)][BF4](2 + n) {L=2,5,8-trithia[9](2,9)-1,10-phenanthrolinophane; L′=MeCN, Cl−, Br−, I−; n=charge of L′} with an excess of I2 (molar ratios of 6, 10 and 20 have been used), in the presence of the stoichiometric amount of I− (as Bu4nNI) necessary to balance the charge of the complex cation [Ni(L)(L′)](2 + n)+. An X-ray diffraction analysis shows that, independently of the nature of L′, both 1 and 2 contain the complex cation [Ni(L)(MeCN)]2+, which is therefore capable of templating two different polyiodide networks based on interacting I3−/I5− and I5−/I7 units, respectively. The solid state FT-Raman spectra of 1 and 2 are discussed based on their structural features. 相似文献
5.
Carolina Alarcón-Payer Duane Choquesillo-Lazarte Guido Crisponi Juan Niclós-Gutiérrez 《Inorganica chimica acta》2005,358(6):1918-1926
Three new thiodiacetato-Cu(II) chelates have been synthesized and studied by X-ray crystallography and by thermal, spectral and magnetic methods. [Cu(tda)]n (1) is a 3D-polymer with a pentadentate tda, which acts with a fac-O2 + S(apical)-tridentate chelating conformation and as a twofold anti, syn-μ-η1:η1 carboxylate bridge. In its square pyramidal Cu(II) coordination (type 4 + 1) four O(carboxylate) donors define a close regular square base, but the Cu-S(apical) bond deviates 27.4° from the perpendicular to the mean basal plane. Each anti,syn-bridging carboxylate group exhibits two C-O (average 1.26(1) Å) and two Cu-O bonds (average 1.958(7) Å), which are very similar in length to each other. In contrast, the mixed-ligand complexes of [Cu(tda)(Him)2(H2O)] (compound 2, distorted octahedral, type 4 + 1 + 1) and [Cu(tda)(5Mphen)] · 2H2O (compound 3, distorted square pyramidal, type 4 + 1) have molecular structures and the tda ligand displays only a fac-O2 + S(apical)-tridentate conformation. The Cu-S(apical) bond lengths (2.570(1), 2.623(1) or 2.573(1) Å for 1, 2 or 3, respectively) are shorter than those previously reported for closely related Cu(II)-tda derivatives. The different tda ligand roles in their Cu(II) derivatives are rationalized on the basis of crystal packing forces driving in the absence or presence of auxiliary ligands (with two or three N-donor atoms). 相似文献
6.
Tai-Nan Chen Ming-Li Tsai Ming-Hsi Chiang Wen-Feng Liaw 《Inorganica chimica acta》2006,359(8):2525-2533
[PPN][Se5Fe(NO)2] (1) and [K-18-crown-6-ether][S5Fe(NO)2] (2′) were synthesized and characterized by IR, UV-Vis, EPR spectroscopy, magnetic susceptibility, and X-ray structure. [PPN][Se5Fe(NO)2] easily undergoes ligand exchange with S8 and (RS)2 (R = C7H4SN (5), o-C6H4NHCOCH3 (6), C4H3S (7)) to form [PPN][S5Fe(NO)2] and [PPN][(SR)2Fe(NO)2]. The reaction displays that [E5Fe(NO)2]− (E = Se (3), S (4)) facilely converts to [Fe4E3(NO)7]− by adding acid HBF4 or oxidant [Cp2Fe][BF4] in THF, respectively. Obviously, complexes 1 and 2′ serve as the precursors of the Roussin’s black salts 3 and 4. The electronic structure of {Fe(NO)2}9 core of [Se5Fe(NO)2]− is best described as a dynamic resonance hybrid of {Fe+1(NO)2}9 and {Fe−1(NO+)2}9 modulated by the coordinated ligands. The findings, EPR signal of g = 2.064 for 1 at 298 K, implicate that the low-molecular-weight DNICs and protein-bound DNICs may not exist with selenocysteine residues of proteins as ligands, since the existence of protein-bound DNICs and low-molecular-weight DNICs in vitro has been characterized with a characteristic EPR signal at g = 2.03. In addition, complex 2′ treated human erythroleukemia K562 cancer cells exposed to UV-A light greatly decreased the percentage survival of the cell cultures. 相似文献
7.
Christof Suchentrunk 《Inorganica chimica acta》2006,359(1):267-272
The new compounds [K(C12H24O6)][Rb(C12H24O6)]2Ge9 · 6NH3, [Rb(C12H24O6)]3Ge9 · 9NH3 and [Cs(C12H24O6)]3Ge9 · 6NH3 were prepared by the extraction of binary and ternary phases of the nominal composition K2Rb2Ge9, Rb4Ge9 and K2Cs2Ge9 with liquid ammonia in the presence of 18-crown-6. The resulting crystals were characterized by low temperature X-ray structure analysis. All of them contain the 21 electron cluster , which is coordinated by alkali metal cations in ion-paired arrangements. The cages were assigned their specific point group symmetry and were compared with hitherto known structures. 相似文献
8.
Julio Esteban 《Inorganica chimica acta》2008,361(5):1274-1280
A new series of biscyclometalated dinuclear rhodium (II) compounds with the general formula Rh2(O2CR)2(PC)2 · 2H2O, being PC = (C6H4)P(C6H5)2, R = CH3 (1 · 2H2O), PC = [(p-CH3 OC6H3)P(p-CH3 OC6H4)2], R = CF3 (2 · 2H2O), PC = (C6H4)P[CH(CH3)2]2, R = CH3 (3 · 2H2O) and PC = (C6H4)P(C6H5)2, R = C6F5 (4 · 2H2O) has been obtained. The crystal structures for these compounds have been determined by X-ray diffraction and the main structural trends, bond lengths, bond angles and torsion angles have been analyzed, and have also been compared with the structural parameters for different analogous complexes described previously in the literature. 相似文献
9.
Ruo-Jie Tao Chong-Zhen Mei Qing-Lun Wang Dai-Zheng Liao 《Inorganica chimica acta》2004,357(7):1985-1990
A dissymmetrical double Schiff base Cu(II) mononuclear complex: CuHL (1) (where H3L is N-3-carboxylsalicylidene-N′-salicylaldehyde-1,2-diaminoethane) and two trinuclear complexes: [CuL(H2O)CoCuL] · H2O · CH3OH (2) and [(CuL)2Ni] · 2H2O (3) have been synthesized and characterized by means of elemental analyses, IR and electronic spectra. The crystal structures of two heterotrinucler complexes were determined by X-ray analysis. Each dissymmetrical cell unit of the complex 2 contains two heterotrinucler neutral molecules. In each neutral molecule, the central Co2+ ion is located at the site of O6 with a distorted octahedral geometry and one terminal Cu2+ ion at the four-coordination site of N2O2, but the other one at the square-pyramidal environment of N2O3. Each dissymmetrical unit of the complex 3 contains a heterotrinucler neutral molecule, whose structure is similar to that of 2 except two terminal Cu2+ ions both at the inner site of N2O2. The magnetic properties of two heterotrinucler complexes have been determined in the temperature range of 5-300 K, which indicate that the interaction between the central Co2+ ion or Ni2+ ion and the outer Cu2+ ions is antiferromagnetic. The exchange integrals are equal to −26.2 cm−1 for 2 and −50.6 cm−1 for 3. 相似文献
10.
Reaction of 4-amino-6-methyl-1,2,4-triazin-thione-5-one (AMTTO, 1) with 2-thiophenecarboxaldehyde and 2-furaldehyde led to the corresponding iminic compounds 6-methyl-4-[thiophene-2-yl-methylene-amino]-3-thioxo-[1,2,4]-triazin-3,4-dihydro(2H)-5-one (TAMTTO, 2) and 4-[furan-2-yl-methylene-amino]-6-methyl-3-thioxo-[1,2,4]-triazin-3,4-dihydro(2H)-5-one (FAMTTO, 3). Treatment of 2 with AgNO3 gave the complex [Ag2(TAMMTO)4](NO3)2 · 4MeOH (4) and of 2 and 3 with [Ag(PPh3)2]NO3 gave the complexes [Ag(TAMTTO)(PPh3)2]NO3 · 1.5THF (5) and [Ag(FAMTTO)(PPh3)2]NO3 (6), respectively. All the compounds have been characterized by elemental analyses, IR spectroscopy and mass spectrometry. Compound 2 and all the complexes have been characterized by X-ray diffraction studies, respectively. In addition, 5 and 6 have been characterized by 31P NMR spectroscopy. Crystal data for 2 at −80 °C: monoclinic, space group C2/c, a=2319.6(2), b=609.8(1), c=1673.6(2) pm, β=106.14(1)°, Z=8, R1=0.0523; for 4 at −80 °C: triclinic, space group , a=877.6(1), b=1085.2(1), c=1557.7(2) pm, α=77.14(1)°, β=80.87(1)°, γ=78.18(1)°, Z=1, R1=0.0407; for 5 at 20 °C: triclinic, space group , a=1151.1(2), b=1225.1(2), c=1887.4(3) pm, α=78.04(1)°, β=86.20(1)°, γ=76.03(1)°, Z=2, R1=0.0662; for 6 at −80 °C: triclinic, space group , a=1189.7(2), b=1387.8(2), c=1410.9(2) pm, α=94.74(2)°, β=95.12(2)°, γ=112.41(2)°, Z=2, R1=0.0511. 相似文献
11.
Anna M.M. Meij 《Inorganica chimica acta》2005,358(4):1005-1011
The aqueous solution behaviour of the equilibrium related cis-[PdCl2(PTA)2] and [PdCl(PTA)3]Cl complexes has been investigated in the presence of acid and iodide ions. Several of the resulting species were identified and a reaction scheme accounting for identified complexes is proposed. The crystal structures of trans-[PdI2(PTA-H)2][PdI3(PTA)]2 · 2H2O (1) (PTA-H+ = protonated form of PTA) and trans-[PdI2(PTA)2] (2) are reported. The geometry around the Pd(II) metal centre in 1 (for both the cation and anion) and 2 is distorted square planar. The PTA ligands occupy a trans orientation in the cation of 1 and in complex 2. Compound 1 represents a rare example of a Pd(II) system wherein the cation:anion pair, in a 1:2 ratio, are both coordination complexes. It is the first d8 Ni-triad square planar complex containing only one PTA ligand and only the second platinum group metal complex. For the cation in 1, the bond distances and angles are Pd(1)-P(1) = 2.2864(16) Å, Pd(1)-I(1) = 2.6216(7) Å, P(1)-Pd(1)-P(1)′ = 180.00(7)° and P(1)-Pd(1)-I(1) = 87.62(4)°, while in the anion the bond distances are Pd(2)-P(2) = 2.2377(15) Å, Pd(2)-I(4) = 2.5961(13) Å, Pd(2)-I(2) = 2.6328(13) Å, Pd(2)-I(3) = 2.6513(8) Å, while the angles are P(2)-Pd(2)-I(4) = 90.00(5)°, P(2)-Pd(2)-I(2) = 89.69(5)°, I(4)-Pd(2)-I(2) = 179.57(2)°, P(2)-Pd(2)-I(3) = 175.19(4)°, I(4)-Pd(2)-I(3) = 90.29(4)° and I(2)-Pd(2)-I(3) = 90.05(4)°. Bond distances and angles of the coordination polyhedron in 2 are Pd-P = 2.327(3) Å, Pd-I = 2.5916(10) Å, P-Pd-I = 89.13(7)° and P-Pd-P = 180.00(13)°. The average effective- and Tolman cone angles for the two ligands, calculated from the crystallographic data, are 115° and 117° for PTA and PTA-H, respectively. 相似文献
12.
Stefan Köcher Anthony L. Spek Rajendra Prasad Gerard van Koten 《Inorganica chimica acta》2006,359(14):4454-4462
The meta-diaminoaryl ferrocenes Fc-NCN-H (3) and Fc-CC-NCN-H (5) (Fc = (η5-C5H5)(η5-C5H4)Fe, NCN-H = C6H3(CH2NMe2)2-3,5) can be used as precursors in the preparation of heterobimetallic transition metal complexes of structural type Fc-NCN-MX (NCN = [C6H2(CH2NMe2)2-2,6]−; MX = PdCl (7), PtCl (8), PtI (9)) and Fc-CC-NCN-MX (MX = PdCl (11), PdI (12), PtCl (13)), respectively. They are accessible by applying different synthesis procedures, including oxidative addition and metallation-transmetallation processes.Cyclovoltammetric studies show that the ferrocene moieties in 3, 5, 7-9 and 11-13 can reversibly be oxidised. The potential of the Fe(II)/Fe(III) redox couple decreases with increasing electron density at the NCN pincer unit. The use of 8 as a possible (electro)chemical sensor in the detection of SO2 is discussed as well.The solid-state structures of 8 and 13 are reported. The crystals of 8 contain two molecules of 8 in the asymmetric unit. The plane of the C6H2 moiety is with 27.2(3)° and 38.2(3)° tilted towards the C5H4 entity, while in 13 an angle of 45.9(3)° can be found. The d8-electron configured platinum atoms possess a somewhat distorted square-planar surrounding, setup by two Me2NCH2ortho-substituents, the NCN Cipso carbon atom and the chloride ligand. 相似文献
13.
Two novel complexes [Cu(DBA)2(1,10-phen)]n (1) and [Cd(DBA)2(1,10-phen)2] (2) [HDBA = benzilic acid: (C6H5)2C(OH)COOH] have been synthesized and characterized by element analysis and fluorescence spectroscopy. The crystal structures of compounds 1, 2 and HDBA (3) were also determined. Complex 1 is a one-dimensional (1D) helical infinite chain, in which [(1,10)-phen]Cu(II) units were bridged by benzilic acid. Complex 2 is a mononuclear structure, and is self-assembled through π-π stacking interactions to form a 1D helical chain. Compound 3 is self-assembled to form a 1D helical chain through hydrogen bonds interactions. Thermal analyses indicate that complexes 1 and 2 are stable under 200 and 254 °C in solid state, respectively. 相似文献
14.
Two novel complexes, Cd(HTMA)(NC5H5)2 · 0.5CH3OH · 0.5DMF (1) and Cd(HTMA) · 2H2O (2), of cadmium (II)-trimesates are obtained from slow vapor diffusion and urea hydrolysis, respectively. The Cd(II) centers in the two complexes are bridged by three separate HTMA3− ligands using a same coordination fashion, which contains one monodentate and two chelating bidentate carboxyl groups to form the herringbone-like motif. The herringbone-like motif is further interlinked to construct the two-dimensional Cd(II)-HTMA layer, which is stacked by mutual π-stacking of pyridines for 1 and by hydrogen bond of waters for 2. Thermal stabilities of the two complexes were investigated and the results indicated that Cd(II)-TMA layers in the two complexes are stable still upon 190 °C. 相似文献
15.
Dongwon Min 《Inorganica chimica acta》2006,359(2):577-584
Novel bipyridine-type linking ligands L1 ((4-py)-CHN-C10H6-NCH-(4-py)) and L2 ((3-py)-CHN-C10H6-NCH-(3-py)), a pair of isomers due to possessing different pairs of terminal pyridyl groups, were prepared by the Schiff-base condensation. In ligand L1, the N?N separation between the terminal pyridyl groups is 16.0 Å, with their nitrogen donor atoms at the para positions (4,4′). The corresponding N?N separation in ligand L2 is 14.2 Å, with the nitrogen donor atoms at the meta positions (3,3′). 1-D zigzag-chain coordination polymers [Zn(L1)(NO3)2] (1) and [Zn(L2)(NO3)2] (2) were prepared by reactions of Zn(NO3)2 · 6H2O with ligands L1 and L2, respectively, by solution diffusion. Polymer 3, [Cd(L1)1.5(NO3)2], prepared from Cd(NO3)2 · 4H2O and L1, exhibits a 1-D ladder structure, whose repeating ladder unit consists of four Cd metals and four L1 ligands to create a large 76-membered ring with dimensions of 20.8 × 20.8 Å. All products were structurally characterized by X-ray diffraction. 相似文献
16.
Yun-Sheng Ma 《Inorganica chimica acta》2008,361(5):1363-1371
The reactions of Ln(NO3)3 · xH2O, CoSO4 · 7H2O or ZnSO4 · 6H2O and 2-pyridylphosphonic acid under hydrothermal conditions result in heterometallic phosphonate compounds with formula [Ln2M3(C5H4NPO3)6] · 4H2O (Ln2M3; M = CoII or ZnII; Ln = LaIII, CeIII, PrIII, NdIII, SmIII, EuIII, GdIII, TbIII, DyIII). These compounds are isostructural and crystallize in a chiral cubic space group I213. Each structure contains the {LnO9} polyhedra and {MN2O4} octahedra which are connected by edge-sharing to form an inorganic open-framework structure with a 3-connected 10-gon (10, 3) topology. The nature of LnIII-CoII magnetic interactions in Ln2Co3 is investigated by a comparison with their LnIII-ZnII analogues. It is found that the LnIII-CoII interaction is weak antiferromagnetic for Ln = Ce and ferromagnetic for Ln = Sm, Gd, Tb and Dy. In the cases of Ln = Pr, Nd and Eu, no significant magnetic interaction is observed. 相似文献
17.
Two new organic-inorganic hybrid compounds [Zn(phen)(SO4)(H2O)2]n (1) and [Cu(phen)(H2O)2] · SO4 (2) have been prepared by conventional aqueous solution synthesis and characterized by single-crystal X-ray diffraction, IR spectroscopy, thermal gravimetric analysis (TGA) and fluorescent spectroscopy. In compound 1, the sulfate group adopts bidentate mode to coordinate with two Zn(II) ions to form one-dimensional polymer. The one-dimensional polymers are further linked together via the intermolecular hydrogen-bonding and π-π stacking interactions to form a 3D supramolecular framework. Compound 2 is build up of discrete [Cu(phen)(H2O]2+ cations and SO42− anions to form a three-dimensional framework via hydrogen-bonding and π-π stacking interactions. Furthermore, the luminescent properties of both 1 and 2 were studied. The complexes 1 and 2 excited at 280 nm wavelength produced characteristic luminescence features, arising maybe due to the π-π transitions. 相似文献
18.
Marcos Flores-Alamo Alejandro Solano-Peralta Rubén A. Toscano Enrique Camarillo Héctor Murrieta 《Inorganica chimica acta》2004,357(15):4596-4601
This is the first reported example of a photochromic property presented by the change of a counterion in a coordination compound: the colour of the trans-[CrCl2(cyclam)]2ZnCl4 (1) is dark green while the trans-[CrCl2(cyclam)]Cl (2) is a reddish purple. The dark green colour of 1 under a fluorescent lamp changes to a deep purple when it is irradiated with an incandescent lamp; when the latter light is turned off, the dark green colour reappears instantaneously, this being a reversible process. Besides, the electron paramagnetic resonance (EPR) spectra of these polycrystalline samples show a very broad isotropic peak centred at g = 1.995 for 1 and for 2 a rhombic one at g = 4.309, 3.107 and 1.223. Their molar magnetic susceptibilities, χMdc, against temperature (2-300 K) follow Curie Weiss behaviour. For 1, a low antiferromagnetic coupling (θ = −2.78 K) in the solid state was found as it approaches 2 K, while for 2, there was found a smaller antiferromagnetic coupling (θ = −0.40 K). From the luminescence studies at 17 K, the lifetime for 1 was found to be twice that for 2. The crystal and molecular structure of 2 were determined and discussed. Compounds 1 and 2 show the same trans-RSSR configuration with different hydrogen bonding networks. In 1 the supramolecular array includes intermolecular interactions in which the chromium atoms interact through the zinc atom of the tetrachlorozincate counterion via hydrogen bonding with the extraordinary consequence of showing the previously described physical properties. This has been supported by theoretical calculations, in which it is clearly observed that the HOMO orbital of 1 is a highly delocalised molecular orbital among Cr(III)?Zn(II)?Cr(III), thus giving even more evidence for the strong Cr(III)-Cr(III) interaction through the ZnCl4 moiety via hydrogen bonding. 相似文献
19.
Palladium(II) and platinum(II) complexes with N-alkylpyridylpyrazole-derived ligands, 2-(1-ethyl-5-phenyl-1H-pyrazol-3-yl)pyridine (L1) and 2-(1-octyl-5-phenyl-1H-pyrazol-3-yl)pyridine (L2), cis-[MCl2(L)] (M = Pd(II), Pt(II)), have been synthesised. Treatment of [PdCl2(L)] (L = L1, L2) with excess of ligand (L1, L2), pyridine (py) or triphenylphosphine (PPh3) in the presence of AgBF4 and NaBPh4 produced the following complexes: [Pd(L)2](BPh4)2, [Pd(L)(py)2](BPh4)2 and [Pd(L)(PPh3)2](BPh4)2. All complexes have been characterised by elemental analyses, conductivity, IR and NMR spectroscopies. The crystal structures of cis-[PdCl2(L2)] (2) and cis-[PtCl2(L1)] (3) were determined by a single crystal X-ray diffraction method. In both complexes, the metal atom is coordinated by one pyrazole nitrogen, one pyridine nitrogen and two chlorine atoms in a distorted square-planar geometry. In complex 3, π-π stacking between pairs of molecules is observed. 相似文献
20.
Ludovic Chahen 《Inorganica chimica acta》2005,358(12):3417-3422
The new aryl phosphinites PPh2OR (R = 2,4,6-Me3C6H2, 1; R = 2,6-Ph2C6H3, 2) have been prepared from chlorodiphenylphosphine and the corresponding phenols. In these ligands, the ortho-positions of the aromatic phosphite function are blocked by methyl and phenyl substituents, which allows coordination to metal centres without ortho-metallation. Thus, reaction with [PdCl2(cod)] leads to the complexes trans-[PdCl2(PPh2OR)2] (R = 2,4,6-Me3C6H2, 3; R = 2,6-Ph2C6H3, 4), while the reaction with [Rh2(CO)4Cl2] gives trans-[Rh(CO)Cl(PPh2OR)2] (R = 2,4,6-Me3C6H2, 5; R = 2,6-Ph2C6H3, 6). The single-crystal X-ray structure analyses of 3 and 5 confirm the trans-coordination of the new ligands in these square-planar complexes. 相似文献