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International Tabies for Crystaflography (2008). VoL A, Space group 4. pp. 120-123.

P2i    C²2

No. 4    P1 2,1

UNIQUH AXIS b

2    Monoclinic

Patterson symmetry P12/m 1

Origin on 2,

Asymmetric unit 0<x<l; 0<y<l; 0<z<ś Symmetry operations

(1) t    (2) 2(0,1,0) O.y.O

CONTINUED

No. 4

P 2j

Generators selected (I); *(1,0,0); *(0,1,0); f(0,0,1); (2)

Positions

Multiplicity, Wyckoff letter, Site symmetry

Coordinates

Reflection conditions

General:

2 a 1

(l)x,;y,z    (2)x,y + \,ż

0&0: k = 2n

Symmetry of special projections

Along [001] plgl a' = a b' = b Origin at0,0,z

Along [100] p 1 lg

a' = b b' = c_/( Origin at x,0.0

Along [010] p2

a' = c b' = a Origin at 0,y.0

Maximal non-isomorphic subgroups

i ran aj i

Ila nonę Ilb nonę

Maximal isomorphic subgroups of lowest index

lic [2] P12,1 (c' = 2c or a' = 2a or a' = a + c,c' = —a + c) (P2,_F 4); [3] P12,1 (b' = 3b) (P2,, 4)

Minimal non-isomorphic supergroups

I    [2]P2,/m(ll); [2] P2,/c(14); [2]P222, (17); [2]/>2,2,2(18); [2JP2.2.2, (19); [2JC2 22, (20); [2]Pmc2₁ (26); [2]Pca2, (29); [2] Pmn2_l (31); [2] Pna2, (33); [2] Cmc2, (36); [2] P4, (76); [2] P4₃ (78); [3] P6, (169); [3]P6_S (170); [3) P6₃ (173)

II    [2] C121 (C2, 5); [2] A121 (C2, 5); [2] 1121 (C2,5); [2] P121 (b' = |b) (P2, 3)

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