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1.
Manfredo Hrner Vanessa Santana Carratu Regine Herbst‐Irmer Ccilia Maichle Mssmer Joachim Strhle 《无机化学与普通化学杂志》2003,629(2):219-222
The reaction of cadmium acetate in methanol with 1, 3‐bis(4‐nitrophenyl)triazene in THF in the presence of KOH yields K[Cd(O2NC6H4NNNC6H4NO2)3] in form of hexagonal prismatic, red crystals with the trigonal space group R3¯ and a = 12.229(2), c = 48.988(10) Å and Z = 6. In the anionic cadmium complexes, which are located along the threefold axis, the Cd atoms are coordinated in a trigonal prismatic arrangement by the atoms N(1) and N(3) of three triazenido ligands. The potassium cations are coordinated icosahedrally by oxygen atoms of each one nitro group of six neighbouring anionic complexes. The Cd‐N distances are 2.376(4) and 2.350(4) Å, and the K‐O distances are in the range of 2.833(6) to 3.365(6) Å. 相似文献
2.
Gelson Manzoni de Oliveira Manfredo H?rner Milton Seiffert Adailton Jo?o Bortoluzzi 《Journal of chemical crystallography》1999,29(2):131-136
Abstract List
Index abstracts 相似文献3.
In this paper, we obtain some rigidity theorems for compact Riemannian manifolds Ω with boundary M and nonnegative Ricci curvature; for instance, we prove that the existence of certain functions on M together with a lower bound c > 0 on the principal curvtures of M imply that Ω is an euclidean ball of radius $ {1\over c} $ . 相似文献
4.
Leonardo C. Ferreira Carlos A. L. Filgueiras Lorenzo C. Visentin Jairo Bordinho Manfredo Hrner 《无机化学与普通化学杂志》2008,634(11):1896-1900
The preparation and characterization of two novel HgCl2 and Hg(SCN)2 complexes with bis[N‐(2‐tert‐butylphenyl)imine]acenaphthene is here described. One‐pot reaction techniques were used, leading to high yields of 75 % and 81 %, respectively. The complexes were characterized by microanalysis, i.r. and 1HNMR spectroscopy, and by single crystal X‐ray diffraction. The structures of the complexes present similar characteristics, the most outstanding being the formation of dimers via intermolecular interaction. Whereas the HgCl2 complex shows a unidimensional network due to strong π–π interactions, its Hg(SCN)2 counterpart displays a supramolecular arrangement resulting from non classical hydrogen bond formation. 相似文献
5.
An ethanolic solution of CuCl / ethylendiamine reacts with 1.3‐bis‐ (phenyltriazene)benzene in THF leading to the deprotonation of the bis triazene ligand to give orange crystals of [CuII(en)3][CuI4{(NNN‐Ph)2C6H4}3], an example of a rare complex salt of copper with mixed valence states. In the anion complex [CuI4{(NNNPh)2C6H4}3]2? the copper(I) ions are disposed linearly as single, bridged pairs in the two extremes of an axis, each of them presenting a trigonal bipyramidal alike coordination arrangement. 相似文献
6.
Stability of hypersurfaces with constant mean curvature 总被引:12,自引:0,他引:12
7.
Manfredo Hörner Gelson Manzoni de Oliveira Eduardo Giuliani Koehler Lorenzo do CantoVisentin 《Journal of organometallic chemistry》2006,691(6):1311-1314
Deprotonated 1,3-bis(3-acetylphenyl)triazene reacts with Hg(CH3COO)2 and pyridine to give light-yellow crystals of {[HgII(RC6H4NNNC6H4R)2Py]}n (R = acetyl). The tectons [HgII(RC6H4NNNC6H4R)2Py] [R = CH3C(O)] are linked to pairs as centrosymmetric dimers through reciprocal metal-η2-arene π-interactions. The dimeric units are operated by a screw axis 21 parallel to the crystallographic direction [0 1 0], also through a reflection-translation plane parallel to the c-axis, resulting a supramolecular bidimensional (2D) assembling of the dimeric tectons through non classical C-H?(O)CCH3 bonding. 相似文献
8.
Manfredo Montagnana 《Annali di Matematica Pura ed Applicata》1967,77(1):283-301
Suuto Si studiano particolari operatori differenziali del secondo ordine con proprietà massimali e si impiegano per riottenere con
un procedimento costruttivo la dimostrazione del teorema di esistenza e unicità degli autovalori per un problema ai límiti.
Lavoro eseguito nell'ambito dell'attività del Gruppo di Ricerca N. 23. del Comitato per la Matematica del CNR. 相似文献
Summary A particular kind of second order differential operators with maximal properties is studied, and used to obtain constructively the proof of the existence and uniqueness theorem for eigenvalues of a boundary problem.
Lavoro eseguito nell'ambito dell'attività del Gruppo di Ricerca N. 23. del Comitato per la Matematica del CNR. 相似文献
9.
In this work we consider a complete submanifold M with parallel mean curvature vector h immersed in a space form of constant sectional curvature c £ 0c\leq 0. If M has finite total curvature and |H|2 > -c|H|^2>-c, we prove that M must be compact. 相似文献
10.
Manfredo P. do Carmo Detang Zhou 《Transactions of the American Mathematical Society》1999,351(4):1391-1401
We obtain some sharp estimates on the first eigenvalues of complete noncompact Riemannian manifolds under assumptions of volume growth. Using these estimates we study hypersurfaces with constant mean curvature and give some estimates on the mean curvatures.