230种晶体学空间群的记号

230种晶体学空间群的记号
Symbols of the 230 Crystallographic Space Groups
空间群是点对称操作和平移对称操作的对称要素全部可能的组合。

点群表示晶体外形上的对称关系，空间群表示晶体结构内部的原子及离子间的对称关系。

空间群一共230个，它们分别属于32个点群。

晶体结构的对称性不能超出230个空间群的范围，而其外形的对称性和宏观对称性则不能越出32个点群的范围。

属于同一点群的各种晶体可以隶属于若干个空间群。

230种晶体学空间群的记号
Symbols of the 230 Crystallographic Space Groups
2m 2P P 2m b n
I c22
m 11m P R c m2
m c2
3m 33I P3
I
m m n Pm Pn Fm Fm Fd m
Fd
m d
1.The product was a mixture of unidentified dark blue microcrystals and brown
crystals
2.The mixture was then heated at 180°C for four days in a Teflon-coated steel
autoclave. The product, consisting of clear single crystals of MAP-RHO1 and an unidentified white powder, was recovered by filtration and washed with deionized water.
3.Attempts to isolate this compound by removal of solvent (0 O C, l0-2mmHg)
resulted in decomposition to unidentifiable products.
4.Strong hydrogen bonding occurs only when the hydrogen atom is collinear with
the bonded atoms.
5.The hydrogen atom is located closer to one atom or the other.
6.Here the substitutional hydrogen atom located in a surface vacancy or the
hydrogen at an interstitial position of surface is a half-confined atom which is only weakly bound.
7.The ethylenediamine ligand was chosen for its ability to chelate copper ions
leaving two free positions translocated so that {Cu(en) 2 } 2+ can act as a linking agent between two POMs, via bridging oxygen atoms [4] and (c. We have studied the influence of the initial pH .
8.The ions or molecules surrounding the central atom are called ligands. Ligands
are generally bound to the central atom by a coordinate covalent bond (donating electrons from a lone electron pair into an empty metal orbital), and are said to be coordinated to the atom. There are also organic ligands such as alkenes whose pi bonds can coordinate to empty metal orbitals. An example is ethene in the complex known as Zeise's salt, K+[PtCl3(C2H4)]−.
9.One nickel ion is coordinated by three ligands (with low occupancy of a fourth ligand) and
the second is coordinated by five ligands.
10.The eleven tungsten centers of compound 1 have a distorted octahedral geometry.
11. All the tungsten atoms have distorted octahedral geometry and
the bond-valence sum (BVS) model25 clearly indicates that all the tungsten atoms are in the +6oxidation state.
12.(1) dispersion of the negative charge over many atoms of the polyanion and
13.Anal. Calc. For
14.which is not thought of as being novel.
15.be thought of as和be considered as 和be seen as作为“……被视为/被看作……"
的语义上讲，总体上3个表达一样, 类似还有：regard...as.../ view...as.../ treat...as.../ look on ...as...,etc.
16.The coordination sphere around each of the six equivalent Zn(II)
ions exhibits distorted octahedral geometry, with a single TFA – anion (not shown)
occupying the sixth coordination site in all cases.
17. The coordination geometry of this cadmium ion displays a distorted octahedron, with
His143 N 2 , His153 N 2 , Wat359 and Wat416 forming an octahedral base plane, and His147 N 2 and Wat418 being located at the vertices
18. In these polymers the metal atom exhibits
octahedral geometry but only two coordination sites of transition metal were used to
propagate the network.
19.The coordination geometry of this cadmium ion displays a distorted octahedron, with
His143 N
2 , His15
3 N 2 , Wat359 and Wat416 forming an octahedral base plane, and His147 N 2
and
Wat418 being located at the vertices
20.receives contributions from four nitrogen donors belonging to two en
molecules, two oxygen donors from two cluster anions
21. The coordination geometry around copper ions can approximately be described as
orthorhombically distorted octahedral
22.Each Mn(1) atom is bridged with three symmetry- equivalent Mn(1) atoms through
O(1) atoms and each O(1) atom is linked with three Mn(1) atoms.
23.Each metal ion in the square is six-coordinate; four of the coordination sites are occupied
by the nitrogen atoms of two of bpy ligands and the remaining cis coordination sites
are occupied by cyanide-carbon or cyanide-nitrogen atoms.
24.cube- 50 shaped blocks having
parallel front and rear faces, parallel side faces and parallel upper and lower faces.
25. the two molecules shown in cyan (!) and red (//) are related by a crystallographic
two-fold axis, perpendicular to the plane, likewise red (Hi) and ...
26.with its apex pointing in the direction of flow
27. The 690 (675) em -1 loss with a relatively strong intensity is ascribed to the SiC
symmetric stretching vibration, because the SiC stretching vibrations of organa-silicon compounds are observed between -600 and 800 cm "!
28.The 1100–700 cm−1 range shows the As–O stretching modes of the (AsO3OH)2− and
(As2O7)4− groups. As already mentioned, the complexity of the crystal structure does not allow to be more specific. The strong and sharp band in infrared and the weak one in Raman spectra around 909 cm−1 could be attributed to the antisymmetric bridge stretching vibration, νa s (As–O–As) of pyroarsenate groups [27]. The most intense Raman bands around 876 cm−1 (very weak in IR) and 857 cm−1 correspond to the symmetric stretching vibrations of (AsO3OH)2− and (As2O7)4− groups, respectively.
pound 2 has been synthesized with the same procedure with
Pb(OAc)2 .3H2O
30. The geometry around Cu(1) has the square pyramidal coordination with 3NO donor
atoms in the basal plane and water oxygen atom at the apical position.
31. Each dca ligand adopting
the end-to-end coordination mode is μ-bonded to two MnII ions with an Mn···Mn separ- 32. The two Cys S atoms bind to the copper ions in a distorted
square planar fashion, each S interacting with both copper ions. ..
33. The vibrational results strongly suggest that methionine sulfur is
bound to copper in the proteins.
34.and Nd was bonded to the COO- group of EAA.
35.the electrons are inter-shared between the different atoms.
36.The central atom or ion, together with all ligands comprise the coordination sphere.
37.is the neutral [Cu(bpca)(dca)(H 2 O)] complex in which the three bpca nitrogen atoms
and a terminal dca nitrogen bind to copper in equatorial positions
38.The XPS estimations obtained on the valence state values are in reasonable agreement with those calculated
from bond valence sum calculations of compounds 1-3.
39.Both Sn atoms exist in distorted octa- hedral geometries, each defined by two cis-CH .
40.The Cu I ion is coordinated in a tetrahedral configuration
41.the ligand coordinates only via the phosphorus atom
42.half the dca ligands coordinate directly (through all three nitrogen atoms) to three Mn
atoms
43.W spectroscopic data of solutions of PCs in dimethyl sulfoxide were obtained with a
Beckmann DU-7 W-Vis spectrophotometer
44.The UV-vis-near I R spectra were recorded in N,N-di- methylformamide
(DMF) solution by using a Perkin-Elmer
45. the Sn atom exists in a distorted tetragonal geometry in which the basal plane
is defined by four S atoms and the axial positions are occupied by two butyl substituents 46. The same procedure was carried out with 2 ml of plant extract (10 g/l) instead of rutin
solution.All determinations were carried out in duplicates.
47.] the same procedure was carried out in the absence of ex- tracellular Na, with choline
used in place of Na,
48.Fe1 (Fe1A) with NO5 donor set, including one N atom together with three O
atoms from two L3- ligands and two carboxylic-O atoms from two PhCO2- groups 49.The coordination sphere of Dy1 is completed by two nitrogen atoms (N1 and N7*),
two ... N4 and N5) from a planar pentadentate dihydrazone uni
50.However, the
bond-valence sum calculated for Bi 3+ shows a 32% deficiency from its
ideal value of 3.0.
51.The bond valence sums of oxygens in the polyanion are listed in Table 4, and fall
within the range 1.59-2.03 except for O(11), O(12), O(39), and O(40). The bridging
atoms, O(11) and O(12), have BVS values of 1.19 and 1.32, and are therefore
presumed to be hydroxo groups. T
52.Copper(II) ions display a square-pyramidal coordination geometry (τ = 0.06) for the N 2
OCl 2 donor set, where the basal coordination sites are occupied by one of the bridging chlorine atoms
and the three donor atoms of the tridentate ligand and the apical site is occupied by。