共查询到20条相似文献,搜索用时 15 毫秒
1.
Nurcan Ekici Ziya Kantarci Sevim Akyüz 《Journal of inclusion phenomena and macrocyclic chemistry》1991,10(1):9-18
Two new benzene clathrates of the form Cd(Pyrazine)M(CN)4C6H6, where M = Cd or Hg, have been prepared and their infrared and Raman spectra are reported. 相似文献
2.
Güneş Süheyla Kürkçüoğlu 《Journal of inclusion phenomena and macrocyclic chemistry》2010,67(1-2):191-200
Two new cadmium dimethylpyrazine (2,3-dimethylpyrazine or 2,5-dimethylpyrazine) tetracyanonickelate benzene clathrates, [Cd(C6H8N2)Ni(CN)4]·C6H6, have been prepared in powder form and characterized by FT-IR spectroscopy, Raman spectroscopy, X-ray diffraction, thermal analyses and elemental analyses. Vibrational assignments are proposed for the bands of the host lattice and guest molecule. It is shown that the spectra are consistent with a proposed crystal structure for these compounds derived from X-ray diffraction measurements. The C, H, N, Cd and Ni analyses were carried out for all the compounds. Thermal behaviors of these compounds are followed using TG and DTA techniques. The FT-IR, Raman spectroscopic, XRD, thermal and elemental analyses results propose that these compounds are similar in structure to the Hofmann-type clathrates. Their structure consists of planar polymeric layers, {M–Ni(CN)4}∞, formed from Ni(CN)4 anions coordinated to the bridging 2,3- or 2,5-dimethylpyrazine molecules bound directly to the cadmium. The cadmium atoms are bound to four N atoms of the CN ions and, the Ni atoms are surrounded by four C atoms of the CN groups in a square-planar layer. 相似文献
3.
Sevim Akyüz Tanil Akyüz J. Eric D. Dames 《Journal of inclusion phenomena and macrocyclic chemistry》1996,26(1-3):111-117
The FT-IR and Raman spectra are reported of M(4,4-bipyridyl)Ni(CN)4·nG (where M = Mn, Fe, Co, Cu or Zn and G = benzene or aniline;n = 0–2) clathrates. The host structure consists of a three-dimensional rigid lattice formed by infinite polymeric layers of {M-Ni(CN)4} and 4,4-bipyridyl bridges between the metal (M) atoms of the adjacent polymeric layers. Bidentate 4,4-bipyridyl molecules are found to be centrosymmetric in the structure.Presented at the Sixth International Seminar on Inclusion Compounds, Istanbul, Turkey, 27–31 August, 1995. 相似文献
4.
Ziya Kantarci Celal Batyak Burhan Davarcioĝlu 《Journal of inclusion phenomena and macrocyclic chemistry》2001,39(1-2):115-121
The infrared spectra of the title compounds have been reported. The spectral data suggest that the host framework of these compounds are similar to those of the en-Td-type clathrate compounds. There is good evidence for hydrogen bonding from ligand molecules to benzene molecules as a to hydrogen bond. 相似文献
5.
Izgi T Parlak C Senyel M 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2011,79(2):308-311
New Hofmann type benzene clathrates in the form of M(CyHEA)2Ni(CN)4·2benzene (where CyHEA=2-(1-cyclohexenyl)ethylamine and M=Ni or Cd) have been prepared in powder form and FT-IR and Raman spectra have been reported. The results suggest that title compounds are similar in structure to Hofmann type clathrates and their structures consist of polymeric layers of |M-Ni(CN)4|∞ with the CyHEA molecule bounded to the metal atoms (M). 相似文献
6.
Ziya Kantarci Mehmet Karabacak M. Mahir Bülbül 《Journal of inclusion phenomena and macrocyclic chemistry》2001,40(4):317-321
Two new title compounds have been prepared in powder form. Their spectral data are found to be consistent with the structure foundin Hofmann-Td-type clathrates. 相似文献
7.
Frost RL Palmer SJ 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2011,78(4):1250-1254
The mineral delvauxite CaFe(4)(3+)(PO(4),SO(4))(2)(OH)(8)·4-6H(2)O has been characterised by Raman spectroscopy and infrared spectroscopy. The mineral is associated with the minerals diadochite and destinezite. Delvauxite appears to vary in crystallinity from amorphous to semi-crystalline. The mineral is often X-ray non-diffracting. The minerals are found in soils and may be described as 'colloidal' minerals. Vibrational spectroscopy enables determination of the molecular structure of delvauxite. Bands are assigned to phosphate and sulphate stretching and bending modes. Two symmetric stretching modes for both the phosphate and sulphate symmetric stretching modes support the concept of non-equivalent phosphate and sulphate units in the mineral structure. Multiple water bending and stretching modes imply that non-equivalent water molecules in the structure exist with different hydrogen bond strengths. 相似文献
8.
Ray L. Frost Silmarilly Bahfenne 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2010,75(2):852-854
Raman spectra of coquandite Sb6O8(SO4)·(H2O) were studied, and related to the structure of the mineral. Raman bands observed at 970, 990 and 1007 cm?1 and a series of overlapping bands are observed at 1072, 1100, 1151 and 1217 cm?1 are assigned to the SO42? ν1 symmetric and ν3 antisymmetric stretching modes respectively. Raman bands at 629, 638, 690, 751 and 787 cm?1 are attributed to the SbO stretching vibrations. Raman bands at 600 and 610 cm?1 and at 429 and 459 cm?1 are assigned to the SO42? ν4 and ν2 bending modes. Raman bands at 359 and 375 cm?1 are assigned to O–Sb–O bending modes. Multiple Raman bands for both SO42? and SbO stretching vibrations support the concept of the non-equivalence of these units in the coquandite structure. 相似文献
9.
《Journal of Coordination Chemistry》2012,65(24):2679-2686
Two new Cd(II) coordination polymers, [Cd(C4H6N2)2(C4H2O4)(H2O)2] n (1) (where C4H6N2?=?2-methylimidazole, C4H2O4?=?fumarate), and [Cd(C4H6N2)(H2O)(C4H4O4)] n ?·?nH2O (2), (where C4H4O4?=?succinates), have been prepared and structurally characterized by single crystal X-ray diffraction. Complex 1 crystallizes in the triclinic space group P 1 in a one-dimensional chain structure, in which carboxy is monodentate; a three-dimensional supermolecular network structure was formed through hydrogen bonding. In complex 2, the coordination geometry of the Cd atoms is a pentagonal bipyramid, and a two-dimensional sheet is formed though carboxyl group bridging. In 1 and 2, IR spectra indicate the presence of bridging carboxyl groups, confirmed by structure analyses. 相似文献
10.
Parlak C Alver O Senyel M 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2011,78(5):1487-1491
New Hofmann-T(d) type clathrates in the form of Ni(4-Phpy)(2)M(CN)(4)·2G (where 4-Phpy=4-phenylpyridine, M=Cd or Hg and G=1,4-dioxane) have been prepared in powder form and their FT-IR and Raman spectra have been reported. The results suggest that these compounds are similar in structure to the Hofmann-T(d) type clathrates. 相似文献
11.
《Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy》1994,50(11):1871-1878
The vibrational properties of the diphenylbismuth(III) chloride compounds (C6H5)2BiCl and [N(CH3)4]+[(C6H5)2BiCl2]− have been investigated. A comprehensive assignment of the fundamental modes in the measured Fourier-transform Raman and infrared spectra has been carried out. Normal coordinate calculations of these compounds based on new X-ray crystal structure data have been performed to identify the BiCl stretching and bending vibrations of both compounds. For [N(CH3)4]+[(C6H5)2BiCl2]− in the solid state, the νs(BiCl2) and νas(BiCl2) occur at 215 cm− (Raman) and 237 cm− (Raman), respectively, in good agreement with the calculated wavenumbers. The force constant calculation yields a BiCl stretching force constant of 0.89 × 102 N m−1. 相似文献
12.
13.
《Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy》1976,32(5):1015-1020
The new quinoxaline-2,3-dithioderivative (C8H5N2S2)2, (HQS2)2, was prepared by oxidation of quinoxaline-2,3-dithiol, H2QS2, with iodine or oxygen. These substances and the compound (C8H4N2S)2, Q2S2, have different and characteristic electronic spectra in DMF solution; in the presence of air H2QS2 10−4 M in DMF is transformed within 14 hr into (HQS2)2 and this, after 72 hr, into a new stable not isolated compound. (HQS2)2, H2QS2 and its salts M·HQS2 (M = K, (CH3)2NH2) do not show any ν(SH) band in the region 2500–2600 cm−1 but show, like 2,3-dihydroxy-quinoxaline, a ν(NH) band at 3125–3150 cm−1 and a NH-vibration band at 730–750 cm−1 which are absent in quinoxaline, 2,3-dimethyl- and 2,3-dichloroquinoxaline and in Q2S2. It may be assigned the constitution of quinoxaline-2,3-dithione to H2QS2, bis(quinoxaline)-2,2′-di-sulphide-3,3′-dithione to (HQS2)2 and bis(quinoxaline)-2,2′-3,3′-dithioether to Q2S2. The i.r. spectra of these quinoxaline-2,3-dithioderivatives are compared with those of quinoxaline and its 2,3-disubstituted derivatives and some tentative assignments are given for their ν(NCS) asym., ν(NCS) sym., ν(CS) and δ(NCS) modes. 相似文献
14.
Naumov N. G. Ostanina E. V. Virovets A. V. Schmidtman M. Müller A. Fedorov V. E. 《Russian Chemical Bulletin》2002,51(5):866-871
The cluster anions [Re6X8(CN)6]34– (X = S, Se, or Te) containing 23 cluster valence electrons in the Re6 octahedron were synthesized and isolated as salts with organic cations. The crystal structures of the (Ph4P)3[Re6S8(CN)6], (Ph4P)2(H)[Re6Se8(CN)6]·8H2O, and (Et4N)2(H)[Re6Te8(CN)6]·2H2O clusters were solved by X-ray diffraction analysis. Removal of one electron has virtually no effect on the geometry and interatomic distances in the cluster anion but leads to a substantial change in the electronic spectrum and to an increase in stretching vibration frequencies CN compared to those of the [Re6X8(CN)6]4– anions. 相似文献
15.
Frost RL Palmer SJ 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2011,78(1):248-252
Raman spectroscopy has been used to study the molecular structure of the vanadate mineral pascoite. Pascoite, rauvite and huemulite are examples of simple salts involving the decavanadate anion (V10O28)6-. Decavanadate consists of four distinct VO6 units which are reflected in Raman bands occurring at higher wavenumbers. The Raman spectrum of pascoite is characterised by two intense bands at 991 and 965 cm(-1). Raman bands are observed at 991, 965, 958 and 905 cm(-1) and originate from four distinct VO6 sites in the mineral structure. In the infrared spectra of pascoite, two wavenumber regions are observed between: (1) 837 and 860, and (2) between 803 and 833 cm(-1). These bands are assigned to ν3 antisymmetric stretching modes of (V10O28)6- or (V5O14)3- units. The spectrum is highly complex in the lower wavenumber region, and therefore the assignment of bands is difficult. Bands observed in the 404 to 458 cm(-1) region are assigned to the ν2 bending modes of (V10O28)6- or (V5O14)3- units. Raman bands observed in the 530-620 cm(-1) region are assigned to the ν4 bending modes of (V10O28)6- or (V5O14)3- units. The Raman spectra of the vanadates in the low wavenumber region are complex with multiple overlapping bands which are probably due to VO subunits and MO bonds. 相似文献
16.
Rama Krishna Ch Venkata Reddy Ch Udayachandran Thampy US Chandrasekhar AV Reddy YP Sambasiva Rao P Ravikumar RV 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2012,85(1):160-164
Chlorocadmiumphosphate Cd(HPO(4))Cl·[H(3)N(CH(2))(6)NH(3)](0.5) crystals containing Cu(II) ions have been successfully synthesized at room temperature by using organic amine 1,6-diamino hexane as a template. The samples are characterized by X-ray powder diffraction, Thermal and spectroscopic studies. These are crystallizes in the monoclinic crystal system with cell dimensions: a=1.7697, b=0.6576, c=1.9026nm and β=106.5°. FT-IR spectrum showed the absorption bands related to PO(4), NH(3)(+) ions and other organic molecule vibrations originated from the templated molecule. The prepared crystals are stable at room temperature and as well as up to around 300°C which were confirmed by thermal analysis. Optical absorption and EPR studies suggest that Cu(II) ion enters in to the lattice as tetragonally distorted octahedral symmetry, for which crystal field and spin-Hamiltonian parameters are calculated. Bonding parameters are suggesting that there exists partial covalent nature between Cu(II) ions and ligands. 相似文献
17.
《Solid State Sciences》2004,6(6):593-598
The solution-mediated syntheses and single crystal structures of C6N2H10·Zn(HPO3)2 (I) and (C6N2H8)0.5·ZnHPO3 (II) are reported. Slight variation of the synthesis conditions led to two quite different phases. I contains infinite chains of ZnO4 and HPO3 groups with the protonated organic moiety acting as a template and interacting with the chains by NH⋯O hydrogen bonds and possible CH⋯O interactions. In II, the neutral 1,4-diamino benzene molecule bonds to Zn (as a ligand) and an unusual composite, “pillared”, structure results, with the organic species bridging 63 polyhedral sheets, although NH⋯O bonds are also present. Similarities and differences to other zinc phosphites and phosphates are briefly discussed for I and II. Crystal data: C6N2H10·Zn(HPO3)2, Mr=335.48, monoclinic, C2/c (No. 15), a=17.2471 (14) Å, b=9.0720 (8) Å, c=7.6529 (6) Å, β=103.752 (2)°, V=1163.09 (7) Å3, Z=4, R(F)=0.038, wR(F2)=0.084. (C6N2H8)0.5·ZnHPO3, Mr=199.42, orthorhombic, Pbca (No. 61), a=8.0314 (16) Å, b=8.1299 (16) Å, c=18.830 (4) Å, V=1229.5 (4) Å3, Z=8, R(F)=0.026, wR(F2)=0.055. 相似文献
18.
19.
Ray L. Frost Eloise C. Keeffe Silmarilly Bahfenne 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2010,75(5):1476-1479
Raman spectra of mineral peretaite Ca(SbO)4(OH)2(SO4)2·2H2O were studied, and related to the structure of the mineral. Raman bands observed at 978 and 980 cm?1 and a series of overlapping bands observed at 1060, 1092, 1115, 1142 and 1152 cm?1 are assigned to the SO42? ν1 symmetric and ν3 antisymmetric stretching modes. Raman bands at 589 and 595 cm?1 are attributed to the SbO symmetric stretching vibrations. The low intensity Raman bands at 650 and 710 cm?1 may be attributed to SbO antisymmetric stretching modes. Raman bands at 610 cm?1 and at 417, 434 and 482 cm?1 are assigned to the SO42? ν4 and ν2 bending modes, respectively. Raman bands at 337 and 373 cm?1 are assigned to O–Sb–O bending modes. Multiple Raman bands for both SO42? and SbO stretching vibrations support the concept of the non-equivalence of these units in the peretaite structure. 相似文献
20.
Ziya Kantarci Celal Bayrak Ergün Kasap 《Journal of inclusion phenomena and macrocyclic chemistry》1999,33(3):285-294
IR spectra of Mn(dl-propylenediamine)M(CN)4.nC6H6 (M = Zn, n = 1.25; M = Cd, n = 1.00 or M = Hg, n = 1.18), and IR and Raman spectra of Cd(dl-propylenediamine)M(CN) 4. 1.5C6H6 (M = Cd or Hg) are reported. The spectral data suggest that the former three compounds are similar in structure to the latter two pn-Td-type clathrates. 相似文献