Pnn2 jpeg

International Tables for Crystallography (2006). Vol. A, Space group 34, pp. 236-237.

Pnn 2

No. 34

CIO

2v

Pnnl

mml    Orthorhombic

Patterson symmetry Pmmm

		Pnnl			i
	1 ▼ | i i
rs *; .		: ♦		i	c SI
	i—	—»—	—	i
F.		Plnn \	t

F

\ \

Origin on 112

Asymmetric unit 0<x<j; 0<y<j; 0 <z< Symmetry operations

(3) n(J,0,0 J,l.z    (4) n(0,|,i) j,y,z

<1) 1    (2) 2 0,0, z

*o

o*	0 +
0	Ó

o*

o*

o*

CONTINUED

No. 34

Pnn 2

Generatora selected (1); /(1,0,0); /(0,1,0); r(0,0,1); (2); (3) Positions

Multiplicity,    Coordinates

Wyckoff letter,

Site symmetry

4 c 1    (1 )x,y,z    (2) x,y,z (3) x+ z,z + ?

Reflection conditions

2 b ..2    0,5, z    j,0,z+5

2 a ..2    0,0,z    5,5, z + i

General:

(4) *+ 5,y+ 5,z+ j Oki : k + l = 2n hOl : h + l = 2n hOO: h = 2n OfcO: k — 2n 00/ : l = 2n

Special: as above, plus

hkl : h + k + l = 2n

hkl : h + k + l = 2n

Symmetry of special projections

Along [001] plgg a' = a b — b Origin at 0,0, z

Along [100] clm 1 a = b b = c

Origin at *,0,0

Along [010] c 11 m a = c b' = a

Origin at 0,y,0

Maximal non-isomorphic subgroups

I	[2] Pini (Pc, 7) 1	; 3
	[2] Pnl 1 (Pc, 7) 1	: 4
	[2]Pi 12(P2, 3) 1	; 2
Ua	nonę
Ilb	[2]Fdd2(a' = 2a,b	= 2b,c' = 2c)(43)

Maximal isomorphic subgroups of lowest index

Uc    [3]Pnn2 (a' = 3a or b' - 3b) (34); [3] Pnn2(t = 3c) (34)

Minimal non-isomorphic supergroups

I    [2JPn»n(48); [2] Pnna (52); [2] Pnnm (58); [2]P4₂nm(102); [2]P4nc(104); [2]P4n2(118)

II    [2] Ccc2 (37); [2] Ama2(40); [2] Bbm2(Ama2,40); [2] lmm2(44); [2]Pnc2(a' = ±a)(30); [2] Pcn2(b' = £b)(Pnc2,30); [2]Pba2(ć = jc)(32)

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