The isotypic hydrogen phosphate and arsenate dihydrates M₂HXO₄·2H₂O (M = Rb, Cs; X = P, As)

The four isotypic alkaline metal mono­hydrogen arsenate(V) and phosphate(V) dihydrates M₂HXO₄·2H₂O (M = Rb, Cs; X = P, As) [namely dicaesium mono­hydrogen arsenate(V) dihydrate, Cs₂HAsO₄·2H₂O, dicaesium mono­hydrogen phosphate(V) dihydrate, Cs₂HPO₄·2H₂O, dirubidium mono­hy­dro­gen arsenate(V) dihydrate, Rb₂HAsO₄·2H₂O, and dirubidium mono­hydrogen phosphate(V) dihydrate, Rb₂HPO₄·2H₂O] were synthesized by reaction of an aqueous H₃XO₄ solution with one equivalent of aqueous M₂CO₃. Their crystal structures are made up of undulating chains extending along [001] of tetra­hedral [XO₃(OH)]⁻ anions connected via strong O—H...O hydro­gen bonds. These chains are in turn connected into a three-dimensional network via medium-strength hydrogen bonding involving the water mol­ecules. Two crystallographically different M⁺ cations are located in channels running along [001] or in the free space of the [XO₃(OH)]⁻ chains, respectively. They are coordinated by eight and twelve O atoms forming irregular polyhedra. The structures possess pseudosymmetry. Due to the ordering of the protons in the [XO₃(OH)]⁻ chains in the actual structures, the symmetry is reduced from C2/c to P2₁/c. Nevertheless, the deviation from C2/c symmetry is minute.

Computing details

For all compounds, data collection: APEX2 (Bruker, 2013); cell refinement: SAINT-Plus (Bruker, 2013); data reduction: SAINT-Plus (Bruker, 2013). Program(s) used to solve structure: coordinates of Rb₂HAsO₄.2H₂O for Cs2HAsO4.2H2O, Cs2HPO4.2H2O, Rb2HPO4.2H2O; SUPERFLIP (Palatinus & Chapuis, 2007) for Rb2HAsO4.2H2O. Program(s) used to refine structure: JANA2006 (Petříček et al., 2006) for Cs2HAsO4.2H2O, Cs2HPO4.2H2O, Rb2HPO4.2H2O; Jana2006 (Petříček et al., 2006) for Rb2HAsO4.2H2O. For all compounds, molecular graphics: ATOMS (Dowty, 2006); software used to prepare material for publication: publCIF (Westrip, 2010).

(Cs2HAsO4.2H2O) Dicaesium monohydrogen arsenate(V) dihydrate

Crystal data

Cs2HAsO4·2H2O	F(000) = 784
Mr = 441.8	Dx = 3.694 Mg m^−3
Monoclinic, P21/c	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ybc	Cell parameters from 9992 reflections
a = 7.7015 (3) Å	θ = 2.9–32.6°
b = 14.3265 (5) Å	µ = 13.29 mm^−1
c = 8.1324 (3) Å	T = 100 K
β = 117.7412 (14)°	Plate, clear colourless
V = 794.16 (5) Å^3	0.08 × 0.03 × 0.01 mm
Z = 4

Data collection

Bruker Kappa APEXII CCD diffractometer	2895 independent reflections
Radiation source: X-ray tube	2452 reflections with I > 3σ(I)
Graphite monochromator	Rint = 0.039
ω and φ scans	θmax = 32.6°, θmin = 2.8°
Absorption correction: multi-scan (SADABS; Bruker, 2013)	h = −11→11
Tmin = 0.63, Tmax = 0.88	k = −21→21
29263 measured reflections	l = −12→12

Refinement

Refinement on F	Hydrogen site location: difference Fourier map
R[F > 3σ(F)] = 0.015	All H-atom parameters refined
wR(F) = 0.025	Weighting scheme based on measured s.u.'s w = 1/(σ^2(F) + 0.0001F^2)
S = 1.36	(Δ/σ)max = 0.036
2895 reflections	Δρmax = 0.61 e Å^−3
103 parameters	Δρmin = −0.66 e Å^−3
7 restraints	Extinction correction: B-C type 1 Gaussian isotropic (Becker & Coppens, 1974)
0 constraints	Extinction coefficient: 660 (20)
Primary atom site location: isomorphous structure methods

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Ų)

	x	y	z	Uiso*/Ueq
Cs1	0.741813 (13)	0.731792 (8)	0.746055 (13)	0.00784 (5)
Cs2	0.251517 (13)	0.920139 (7)	0.747393 (13)	0.00975 (6)
As	0.25340 (2)	0.858572 (13)	0.25900 (2)	0.00545 (7)
O1	0.13398 (18)	0.79315 (9)	0.05609 (18)	0.0133 (5)
O2	0.42685 (19)	0.92271 (7)	0.2428 (2)	0.0107 (5)
O3	0.35337 (18)	0.78242 (8)	0.43520 (18)	0.0124 (5)
O4	0.07415 (19)	0.92168 (8)	0.2658 (2)	0.0105 (5)
Ow1	0.7871 (2)	0.91323 (9)	0.5508 (2)	0.0123 (5)
Ow2	0.7157 (2)	0.58410 (9)	0.4535 (2)	0.0117 (5)
Hw21	0.8315 (17)	0.592 (2)	0.541 (3)	0.086 (15)*
Hw11	0.673 (2)	0.911 (2)	0.458 (3)	0.100 (17)*
H1	0.221 (3)	0.7699 (18)	0.032 (5)	0.094 (13)*
Hw12	0.824 (4)	0.9553 (14)	0.634 (3)	0.054 (10)*
Hw22	0.683 (4)	0.5406 (15)	0.374 (3)	0.061 (11)*

Atomic displacement parameters (Ų)

	U^11	U^22	U^33	U^12	U^13	U^23
Cs1	0.00774 (7)	0.00726 (6)	0.00649 (6)	−0.00023 (3)	0.00161 (5)	0.00015 (3)
Cs2	0.00932 (8)	0.00756 (7)	0.01131 (7)	0.00009 (3)	0.00390 (6)	0.00026 (3)
As	0.00500 (9)	0.00517 (9)	0.00524 (9)	−0.00006 (5)	0.00160 (7)	0.00016 (5)
O1	0.0083 (6)	0.0175 (6)	0.0106 (6)	−0.0005 (5)	0.0014 (5)	−0.0075 (5)
O2	0.0083 (6)	0.0104 (6)	0.0134 (6)	−0.0009 (4)	0.0051 (5)	0.0025 (4)
O3	0.0101 (6)	0.0126 (6)	0.0113 (6)	0.0014 (4)	0.0024 (5)	0.0077 (4)
O4	0.0079 (6)	0.0106 (6)	0.0131 (6)	0.0011 (4)	0.0048 (5)	−0.0026 (4)
Ow1	0.0104 (6)	0.0116 (6)	0.0122 (6)	−0.0002 (5)	0.0030 (5)	−0.0025 (5)
Ow2	0.0093 (6)	0.0103 (6)	0.0127 (6)	0.0003 (4)	0.0027 (5)	−0.0030 (4)

Geometric parameters (Å, º)

Cs1—O1^i	3.0269 (11)	Cs2—O3	3.5789 (16)
Cs1—O2^ii	3.2748 (14)	Cs2—O3^ii	3.2022 (12)
Cs1—O3	2.9708 (11)	Cs2—O4	3.4963 (15)
Cs1—O4^iii	3.3209 (14)	Cs2—O4^vi	3.3447 (14)
Cs1—Ow1	3.1489 (16)	Cs2—Ow1^vii	3.1677 (15)
Cs1—Ow1^ii	3.1266 (16)	Cs2—Ow1^v	3.3161 (16)
Cs1—Ow2	3.1194 (16)	Cs2—Ow2^viii	3.3053 (16)
Cs1—Ow2^ii	3.1876 (15)	Cs2—Ow2^ii	3.1643 (14)
Cs2—O1^iv	3.5422 (16)	As—O1	1.7420 (13)
Cs2—O1^ii	3.3565 (13)	As—O2	1.6764 (16)
Cs2—O2^iv	3.6043 (16)	As—O3	1.6761 (12)
Cs2—O2^v	3.3206 (14)	As—O4	1.6725 (15)
O1^i—Cs1—O2^ii	130.63 (4)	O2^iv—Cs2—O3	134.98 (3)
O1^i—Cs1—O3	148.98 (3)	O2^iv—Cs2—O3^ii	66.11 (3)
O1^i—Cs1—O4^iii	72.80 (3)	O2^iv—Cs2—O4	178.72 (3)
O1^i—Cs1—Ow1	83.02 (3)	O2^iv—Cs2—O4^vi	85.07 (3)
O1^i—Cs1—Ow1^ii	80.37 (4)	O2^iv—Cs2—Ow1^vii	108.18 (4)
O1^i—Cs1—Ow2	121.16 (4)	O2^iv—Cs2—Ow1^v	132.02 (3)
O1^i—Cs1—Ow2^ii	66.62 (4)	O2^iv—Cs2—Ow2^viii	46.35 (3)
O2^ii—Cs1—O3	73.11 (3)	O2^iv—Cs2—Ow2^ii	70.42 (4)
O2^ii—Cs1—O4^iii	95.98 (3)	O2^v—Cs2—O3	89.05 (4)
O2^ii—Cs1—Ow1	144.04 (3)	O2^v—Cs2—O3^ii	126.06 (3)
O2^ii—Cs1—Ow1^ii	50.67 (3)	O2^v—Cs2—O4	85.46 (3)
O2^ii—Cs1—Ow2	75.56 (4)	O2^v—Cs2—O4^vi	94.66 (3)
O2^ii—Cs1—Ow2^ii	109.54 (4)	O2^v—Cs2—Ow1^vii	133.45 (3)
O3—Cs1—O4^iii	130.61 (4)	O2^v—Cs2—Ow1^v	48.81 (3)
O3—Cs1—Ow1	70.94 (4)	O2^v—Cs2—Ow2^viii	72.53 (4)
O3—Cs1—Ow1^ii	122.23 (4)	O2^v—Cs2—Ow2^ii	49.77 (3)
O3—Cs1—Ow2	80.48 (4)	O3—Cs2—O3^ii	75.69 (4)
O3—Cs1—Ow2^ii	87.80 (3)	O3—Cs2—O4	46.31 (3)
O4^iii—Cs1—Ow1	107.89 (4)	O3—Cs2—O4^vi	139.42 (3)
O4^iii—Cs1—Ow1^ii	73.89 (4)	O3—Cs2—Ow1^vii	101.16 (4)
O4^iii—Cs1—Ow2	50.40 (3)	O3—Cs2—Ow1^v	81.53 (4)
O4^iii—Cs1—Ow2^ii	139.41 (3)	O3—Cs2—Ow2^viii	161.24 (4)
Ow1—Cs1—Ow1^ii	161.91 (3)	O3—Cs2—Ow2^ii	78.39 (4)
Ow1—Cs1—Ow2	99.11 (4)	O3^ii—Cs2—O4	114.91 (3)
Ow1—Cs1—Ow2^ii	68.47 (5)	O3^ii—Cs2—O4^vi	130.01 (4)
Ow1^ii—Cs1—Ow2	95.60 (4)	O3^ii—Cs2—Ow1^vii	100.41 (3)
Ow1^ii—Cs1—Ow2^ii	98.13 (4)	O3^ii—Cs2—Ow1^v	156.91 (4)
Ow2—Cs1—Ow2^ii	165.33 (4)	O3^ii—Cs2—Ow2^viii	112.04 (4)
O1^iv—Cs2—O1^ii	76.00 (4)	O3^ii—Cs2—Ow2^ii	76.37 (3)
O1^iv—Cs2—O2^iv	45.53 (3)	O4—Cs2—O4^vi	93.65 (3)
O1^iv—Cs2—O2^v	139.91 (3)	O4—Cs2—Ow1^vii	70.99 (4)
O1^iv—Cs2—O3	115.62 (3)	O4—Cs2—Ow1^v	47.24 (3)
O1^iv—Cs2—O3^ii	44.21 (4)	O4—Cs2—Ow2^viii	132.53 (3)
O1^iv—Cs2—O4	134.56 (3)	O4—Cs2—Ow2^ii	110.46 (4)
O1^iv—Cs2—O4^vi	86.30 (4)	O4^vi—Cs2—Ow1^vii	49.56 (3)
O1^iv—Cs2—Ow1^vii	74.97 (4)	O4^vi—Cs2—Ow1^v	71.22 (4)
O1^iv—Cs2—Ow1^v	157.29 (4)	O4^vi—Cs2—Ow2^viii	48.81 (3)
O1^iv—Cs2—Ow2^viii	78.51 (4)	O4^vi—Cs2—Ow2^ii	132.48 (3)
O1^iv—Cs2—Ow2^ii	102.30 (4)	Ow1^vii—Cs2—Ow1^v	87.57 (4)
O1^ii—Cs2—O2^iv	114.04 (3)	Ow1^vii—Cs2—Ow2^viii	94.32 (4)
O1^ii—Cs2—O2^v	131.73 (4)	Ow1^vii—Cs2—Ow2^ii	176.78 (4)
O1^ii—Cs2—O3	43.13 (4)	Ow1^v—Cs2—Ow2^viii	88.66 (4)
O1^ii—Cs2—O3^ii	49.41 (3)	Ow1^v—Cs2—Ow2^ii	95.51 (4)
O1^ii—Cs2—O4	66.80 (3)	Ow2^viii—Cs2—Ow2^ii	86.74 (4)
O1^ii—Cs2—O4^vi	124.44 (3)	O1—As—O2	108.01 (8)
O1^ii—Cs2—Ow1^vii	74.93 (3)	O1—As—O3	106.83 (6)
O1^ii—Cs2—Ow1^v	113.79 (4)	O1—As—O4	104.02 (6)
O1^ii—Cs2—Ow2^viii	154.13 (4)	O2—As—O3	110.99 (6)
O1^ii—Cs2—Ow2^ii	102.86 (3)	O3—As—O4	112.42 (8)
O2^iv—Cs2—O2^v	94.53 (3)

Symmetry codes: (i) x+1, y, z+1; (ii) x, −y+3/2, z+1/2; (iii) x+1, −y+3/2, z+1/2; (iv) x, y, z+1; (v) −x+1, −y+2, −z+1; (vi) −x, −y+2, −z+1; (vii) x−1, y, z; (viii) −x+1, y+1/2, −z+3/2.

Hydrogen-bond geometry (Å, º)

D—H···A	D—H	H···A	D···A	D—H···A
O1—H1···O3^ix	0.85 (3)	1.72 (4)	2.557 (2)	167 (3)
Ow1—Hw11···O2	0.850 (15)	1.897 (16)	2.7425 (17)	172 (3)
Ow1—Hw12···O4^v	0.85 (2)	1.95 (2)	2.7343 (17)	153 (3)
Ow2—Hw21···O4^iii	0.850 (13)	1.922 (16)	2.7480 (17)	164 (3)
Ow2—Hw22···O2^x	0.85 (2)	1.93 (2)	2.7328 (17)	158 (3)

Symmetry codes: (iii) x+1, −y+3/2, z+1/2; (v) −x+1, −y+2, −z+1; (ix) x, −y+3/2, z−1/2; (x) −x+1, y−1/2, −z+1/2.

(Cs2HPO4.2H2O) Dicaesium monohydrogen phosphate(V) dihydrate

Crystal data

Cs2HPO4·2H2O	F(000) = 712
Mr = 397.8	Dx = 3.510 Mg m^−3
Monoclinic, P21/c	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ybc	Cell parameters from 9974 reflections
a = 7.4764 (5) Å	θ = 2.9–32.6°
b = 14.1898 (10) Å	µ = 9.87 mm^−1
c = 7.9535 (6) Å	T = 100 K
β = 116.880 (2)°	Plate, clear colourless
V = 752.61 (9) Å^3	0.05 × 0.04 × 0.01 mm
Z = 4

Data collection

Bruker Kappa APEXII CCD diffractometer	2756 independent reflections
Radiation source: X-ray tube	2503 reflections with I > 3σ(I)
Graphite monochromator	Rint = 0.050
ω and φ scans	θmax = 32.6°, θmin = 2.9°
Absorption correction: multi-scan (SADABS; Bruker, 2013)	h = −11→11
Tmin = 0.63, Tmax = 0.90	k = −21→21
25736 measured reflections	l = −12→12

Refinement

Refinement on F	Hydrogen site location: difference Fourier map
R[F > 3σ(F)] = 0.020	All H-atom parameters refined
wR(F) = 0.033	Weighting scheme based on measured s.u.'s w = 1/(σ^2(F) + 0.0001F^2)
S = 1.61	(Δ/σ)max = 0.030
2756 reflections	Δρmax = 0.88 e Å^−3
101 parameters	Δρmin = −0.65 e Å^−3
5 restraints	Extinction correction: B-C type 1 Gaussian isotropic (Becker & Coppens, 1974)
2 constraints	Extinction coefficient: 1410 (50)
Primary atom site location: isomorphous structure methods

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Ų)

	x	y	z	Uiso*/Ueq
Cs1	0.742006 (15)	0.731846 (10)	0.746496 (12)	0.00725 (6)
Cs2	0.251965 (13)	0.918915 (9)	0.745719 (13)	0.00898 (7)
P	0.25330 (5)	0.85516 (4)	0.25943 (5)	0.00527 (16)
O1	0.1409 (2)	0.79501 (10)	0.06896 (18)	0.0112 (4)
O2	0.4132 (2)	0.91487 (9)	0.2418 (2)	0.0093 (5)
O3	0.3467 (2)	0.78525 (9)	0.42224 (18)	0.0114 (5)
O4	0.0879 (2)	0.91339 (9)	0.2696 (2)	0.0096 (5)
Ow1	0.7811 (3)	0.91652 (10)	0.5516 (2)	0.0118 (5)
Ow2	0.7218 (3)	0.58033 (9)	0.4544 (2)	0.0114 (5)
Hw22	0.688 (4)	0.5330 (12)	0.381 (3)	0.023 (6)*
Hw12	0.816 (4)	0.9668 (11)	0.617 (3)	0.027 (6)*
Hw21	0.8430 (16)	0.5766 (17)	0.538 (3)	0.023 (6)*
Hw11	0.665 (2)	0.9235 (17)	0.460 (3)	0.027 (6)*
H1	0.218 (3)	0.7729 (17)	0.027 (3)	0.053 (10)*

Atomic displacement parameters (Ų)

	U^11	U^22	U^33	U^12	U^13	U^23
Cs1	0.00793 (9)	0.00672 (9)	0.00628 (8)	−0.00014 (3)	0.00250 (6)	0.00015 (3)
Cs2	0.00966 (10)	0.00689 (10)	0.00979 (9)	0.00009 (3)	0.00388 (8)	0.00017 (3)
P	0.0061 (2)	0.0042 (2)	0.00535 (19)	−0.00004 (12)	0.00243 (18)	0.00013 (12)
O1	0.0107 (6)	0.0124 (6)	0.0097 (6)	−0.0013 (5)	0.0038 (5)	−0.0051 (5)
O2	0.0094 (7)	0.0079 (6)	0.0118 (6)	−0.0003 (4)	0.0057 (5)	0.0024 (4)
O3	0.0127 (6)	0.0099 (6)	0.0105 (6)	0.0004 (5)	0.0042 (5)	0.0043 (4)
O4	0.0103 (7)	0.0080 (6)	0.0107 (6)	0.0010 (5)	0.0049 (5)	−0.0024 (5)
Ow1	0.0120 (7)	0.0096 (7)	0.0130 (7)	0.0013 (5)	0.0050 (6)	−0.0011 (4)
Ow2	0.0108 (7)	0.0095 (7)	0.0130 (7)	0.0004 (5)	0.0045 (6)	−0.0026 (4)

Geometric parameters (Å, º)

Cs1—O1^i	3.0595 (13)	Cs2—O3	3.5166 (17)
Cs1—O2^ii	3.2088 (17)	Cs2—O3^ii	3.1570 (14)
Cs1—O3	3.0112 (13)	Cs2—O4	3.4135 (16)
Cs1—O4^iii	3.2464 (17)	Cs2—O4^vi	3.4429 (16)
Cs1—Ow1	3.1249 (17)	Cs2—Ow1^vii	3.1408 (18)
Cs1—Ow1^ii	3.1249 (18)	Cs2—Ow1^v	3.2522 (17)
Cs1—Ow2	3.1186 (18)	Cs2—Ow2^viii	3.2482 (17)
Cs1—Ow2^ii	3.1759 (16)	Cs2—Ow2^ii	3.1339 (18)
Cs2—O1^iv	3.5098 (17)	P—O1	1.6057 (14)
Cs2—O1^ii	3.2901 (15)	P—O2	1.5226 (18)
Cs2—O2^iv	3.5671 (17)	P—O3	1.5267 (14)
Cs2—O2^v	3.4081 (16)	P—O4	1.5195 (18)
O1^i—Cs1—O2^ii	130.63 (4)	O2^iv—Cs2—O3	136.18 (3)
O1^i—Cs1—O3	148.38 (4)	O2^iv—Cs2—O3^ii	66.28 (3)
O1^i—Cs1—O4^iii	71.87 (4)	O2^iv—Cs2—O4	177.48 (3)
O1^i—Cs1—Ow1	84.02 (4)	O2^iv—Cs2—O4^vi	85.70 (4)
O1^i—Cs1—Ow1^ii	80.39 (4)	O2^iv—Cs2—Ow1^vii	106.66 (5)
O1^i—Cs1—Ow2	121.80 (4)	O2^iv—Cs2—Ow1^v	133.82 (3)
O1^i—Cs1—Ow2^ii	64.88 (4)	O2^iv—Cs2—Ow2^viii	47.24 (3)
O2^ii—Cs1—O3	72.74 (4)	O2^iv—Cs2—Ow2^ii	71.15 (5)
O2^ii—Cs1—O4^iii	100.09 (4)	O2^v—Cs2—O3	90.36 (4)
O2^ii—Cs1—Ow1	141.38 (4)	O2^v—Cs2—O3^ii	127.44 (3)
O2^ii—Cs1—Ow1^ii	51.25 (4)	O2^v—Cs2—O4	86.50 (4)
O2^ii—Cs1—Ow2	76.42 (5)	O2^v—Cs2—O4^vi	92.49 (4)
O2^ii—Cs1—Ow2^ii	109.51 (5)	O2^v—Cs2—Ow1^vii	131.85 (4)
O3—Cs1—O4^iii	131.03 (4)	O2^v—Cs2—Ow1^v	48.52 (3)
O3—Cs1—Ow1	68.88 (4)	O2^v—Cs2—Ow2^viii	72.00 (5)
O3—Cs1—Ow1^ii	123.06 (4)	O2^v—Cs2—Ow2^ii	49.42 (3)
O3—Cs1—Ow2	80.63 (4)	O3—Cs2—O3^ii	75.61 (4)
O3—Cs1—Ow2^ii	88.59 (4)	O3—Cs2—O4	42.79 (3)
O4^iii—Cs1—Ow1	108.04 (5)	O3—Cs2—O4^vi	137.43 (3)
O4^iii—Cs1—Ow1^ii	74.69 (5)	O3—Cs2—Ow1^vii	100.74 (4)
O4^iii—Cs1—Ow2	51.21 (4)	O3—Cs2—Ow1^v	80.18 (4)
O4^iii—Cs1—Ow2^ii	136.68 (4)	O3—Cs2—Ow2^viii	162.23 (4)
Ow1—Cs1—Ow1^ii	162.42 (4)	O3—Cs2—Ow2^ii	80.85 (4)
Ow1—Cs1—Ow2	101.10 (5)	O3^ii—Cs2—O4	111.60 (3)
Ow1—Cs1—Ow2^ii	65.90 (5)	O3^ii—Cs2—O4^vi	131.57 (4)
Ow1^ii—Cs1—Ow2	94.02 (4)	O3^ii—Cs2—Ow1^vii	100.66 (4)
Ow1^ii—Cs1—Ow2^ii	99.84 (5)	O3^ii—Cs2—Ow1^v	155.54 (5)
Ow2—Cs1—Ow2^ii	165.64 (4)	O3^ii—Cs2—Ow2^viii	113.18 (4)
O1^iv—Cs2—O1^ii	75.72 (4)	O3^ii—Cs2—Ow2^ii	78.18 (4)
O1^iv—Cs2—O2^iv	41.86 (3)	O4—Cs2—O4^vi	95.01 (4)
O1^iv—Cs2—O2^v	137.66 (3)	O4—Cs2—Ow1^vii	72.16 (5)
O1^iv—Cs2—O3	117.28 (3)	O4—Cs2—Ow1^v	48.61 (4)
O1^iv—Cs2—O3^ii	45.12 (4)	O4—Cs2—Ow2^viii	134.67 (3)
O1^iv—Cs2—O4	135.71 (3)	O4—Cs2—Ow2^ii	110.01 (5)
O1^iv—Cs2—O4^vi	87.53 (4)	O4^vi—Cs2—Ow1^vii	49.06 (4)
O1^iv—Cs2—Ow1^vii	76.76 (4)	O4^vi—Cs2—Ow1^v	70.48 (5)
O1^iv—Cs2—Ow1^v	157.95 (4)	O4^vi—Cs2—Ow2^viii	48.49 (3)
O1^iv—Cs2—Ow2^viii	76.77 (4)	O4^vi—Cs2—Ow2^ii	130.46 (3)
O1^iv—Cs2—Ow2^ii	101.15 (4)	Ow1^vii—Cs2—Ow1^v	87.17 (4)
O1^ii—Cs2—O2^iv	110.59 (3)	Ow1^vii—Cs2—Ow2^viii	92.91 (5)
O1^ii—Cs2—O2^v	133.71 (4)	Ow1^vii—Cs2—Ow2^ii	177.78 (5)
O1^ii—Cs2—O3	44.37 (4)	Ow1^v—Cs2—Ow2^viii	89.26 (4)
O1^ii—Cs2—O3^ii	46.04 (3)	Ow1^v—Cs2—Ow2^ii	94.65 (4)
O1^ii—Cs2—O4	67.05 (3)	Ow2^viii—Cs2—Ow2^ii	85.85 (4)
O1^ii—Cs2—O4^vi	125.66 (3)	O1—P—O2	107.85 (9)
O1^ii—Cs2—Ow1^vii	76.69 (4)	O1—P—O3	107.37 (8)
O1^ii—Cs2—Ow1^v	115.48 (4)	O1—P—O4	104.36 (7)
O1^ii—Cs2—Ow2^viii	152.15 (5)	O2—P—O3	111.25 (8)
O1^ii—Cs2—Ow2^ii	103.61 (4)	O3—P—O4	112.31 (9)
O2^iv—Cs2—O2^v	95.88 (4)

Symmetry codes: (i) x+1, y, z+1; (ii) x, −y+3/2, z+1/2; (iii) x+1, −y+3/2, z+1/2; (iv) x, y, z+1; (v) −x+1, −y+2, −z+1; (vi) −x, −y+2, −z+1; (vii) x−1, y, z; (viii) −x+1, y+1/2, −z+3/2.

Hydrogen-bond geometry (Å, º)

D—H···A	D—H	H···A	D···A	D—H···A
O1—H1···O3^ix	0.85 (3)	1.74 (3)	2.579 (2)	171 (2)
Ow1—Hw11···O2	0.850 (15)	1.902 (15)	2.7400 (19)	169 (2)
Ow1—Hw12···O4^v	0.850 (18)	1.908 (17)	2.747 (2)	169 (3)
Ow2—Hw21···O4^iii	0.850 (12)	1.927 (16)	2.753 (2)	164 (3)
Ow2—Hw22···O2^x	0.850 (19)	1.915 (18)	2.7461 (19)	165 (3)

Symmetry codes: (iii) x+1, −y+3/2, z+1/2; (v) −x+1, −y+2, −z+1; (ix) x, −y+3/2, z−1/2; (x) −x+1, y−1/2, −z+1/2.

(Rb2HAsO4.2H2O) Dirubidium monohydrogen arsenate(V) dihydrate

Crystal data

Rb2HAsO4·2H2O	F(000) = 640
Mr = 346.9	Dx = 3.171 Mg m^−3
Monoclinic, P21/c	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ybc	Cell parameters from 9969 reflections
a = 7.6087 (5) Å	θ = 3.0–39.9°
b = 13.7823 (3) Å	µ = 17.96 mm^−1
c = 7.9260 (3) Å	T = 100 K
β = 119.074 (6)°	Plate, clear colourless
V = 726.43 (7) Å^3	0.09 × 0.06 × 0.01 mm
Z = 4

Data collection

Bruker Kappa APEX II CCD diffractometer	4510 independent reflections
Radiation source: X-ray tube	3170 reflections with I > 3σ(I)
Graphite monochromator	Rint = 0.032
ω and φ scans	θmax = 40.1°, θmin = 3.0°
Absorption correction: multi-scan (SADABS; Bruker, 2013)	h = −12→13
Tmin = 0.29, Tmax = 0.84	k = −24→24
34648 measured reflections	l = −14→13

Refinement

Refinement on F	Hydrogen site location: difference Fourier map
R[F^2 > 2σ(F^2)] = 0.020	All H-atom parameters refined
wR(F^2) = 0.027	Weighting scheme based on measured s.u.'s w = 1/(σ^2(F) + 0.0001F^2)
S = 1.22	(Δ/σ)max = 0.038
4510 reflections	Δρmax = 0.85 e Å^−3
103 parameters	Δρmin = −0.82 e Å^−3
7 restraints	Extinction correction: B-C type 1 Gaussian isotropic (Becker & Coppens, 1974)
0 constraints	Extinction coefficient: 320 (30)
Primary atom site location: iterative

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Ų)

	x	y	z	Uiso*/Ueq
Rb1	0.742563 (17)	0.734776 (10)	0.750523 (15)	0.01081 (4)
Rb2	0.253648 (17)	0.920312 (10)	0.745047 (16)	0.01417 (5)
As	0.256241 (17)	0.858760 (10)	0.257834 (15)	0.00787 (4)
O1	0.13025 (15)	0.79310 (9)	0.04544 (14)	0.0212 (4)
O2	0.43131 (14)	0.92581 (7)	0.24367 (14)	0.0139 (3)
O3	0.36431 (15)	0.77792 (8)	0.43771 (15)	0.0203 (4)
O4	0.07583 (14)	0.92162 (7)	0.27102 (14)	0.0136 (3)
Ow1	0.80300 (15)	0.90481 (8)	0.55311 (15)	0.0142 (4)
Ow2	0.70292 (15)	0.59131 (8)	0.45985 (15)	0.0151 (4)
Hw11	0.6880 (17)	0.8973 (16)	0.454 (3)	0.124 (13)*
Hw22	0.668 (3)	0.5454 (10)	0.378 (2)	0.029 (6)*
Hw12	0.837 (3)	0.9551 (8)	0.624 (2)	0.023 (5)*
Hw21	0.8244 (9)	0.6043 (17)	0.541 (3)	0.095 (10)*
H1	0.223 (2)	0.7724 (16)	0.025 (3)	0.093 (10)*

Atomic displacement parameters (Ų)

	U^11	U^22	U^33	U^12	U^13	U^23
Rb1	0.01071 (6)	0.00994 (6)	0.00939 (6)	−0.00045 (4)	0.00301 (4)	0.00030 (4)
Rb2	0.01171 (6)	0.01029 (6)	0.01747 (7)	−0.00014 (5)	0.00468 (5)	0.00033 (5)
As	0.00700 (6)	0.00742 (6)	0.00797 (6)	−0.00014 (5)	0.00268 (4)	0.00015 (5)
O1	0.0118 (5)	0.0287 (7)	0.0196 (5)	−0.0029 (4)	0.0049 (4)	−0.0149 (5)
O2	0.0100 (4)	0.0139 (5)	0.0171 (5)	−0.0016 (3)	0.0060 (4)	0.0041 (4)
O3	0.0137 (5)	0.0206 (6)	0.0223 (5)	0.0017 (4)	0.0053 (4)	0.0144 (4)
O4	0.0108 (4)	0.0136 (5)	0.0166 (5)	0.0005 (3)	0.0067 (4)	−0.0036 (4)
Ow1	0.0121 (4)	0.0124 (5)	0.0156 (4)	0.0002 (3)	0.0047 (4)	−0.0035 (4)
Ow2	0.0108 (4)	0.0154 (5)	0.0166 (5)	−0.0002 (3)	0.0047 (4)	−0.0047 (4)

Geometric parameters (Å, º)

Rb1—O1^i	2.8478 (10)	Rb2—O3	3.5337 (13)
Rb1—O2^ii	3.2226 (11)	Rb2—O3^ii	3.0423 (11)
Rb1—O3	2.8016 (10)	Rb2—O4	3.3176 (11)
Rb1—O4^iii	3.2714 (11)	Rb2—O4^vi	3.2767 (11)
Rb1—Ow1	2.9750 (12)	Rb2—Ow1^vii	3.0079 (12)
Rb1—Ow1^ii	2.9313 (12)	Rb2—Ow1^v	3.2542 (11)
Rb1—Ow2	2.9382 (12)	Rb2—Ow2^viii	3.2223 (12)
Rb1—Ow2^ii	3.0125 (12)	Rb2—Ow2^ii	2.9922 (12)
Rb2—O1^iv	3.4346 (13)	As—O1	1.7330 (11)
Rb2—O1^ii	3.2546 (12)	As—O2	1.6692 (12)
Rb2—O2^iv	3.5015 (11)	As—O3	1.6765 (10)
Rb2—O2^v	3.1691 (11)	As—O4	1.6689 (12)
O1^i—Rb1—O2^ii	131.86 (3)	O2^iv—Rb2—O2^v	94.69 (3)
O1^i—Rb1—O3	151.09 (3)	O2^iv—Rb2—O3	134.38 (2)
O1^i—Rb1—O4^iii	71.13 (3)	O2^iv—Rb2—O3^ii	65.92 (3)
O1^i—Rb1—Ow1	81.15 (3)	O2^iv—Rb2—O4	178.06 (2)
O1^i—Rb1—Ow1^ii	79.96 (3)	O2^iv—Rb2—O4^vi	84.14 (3)
O1^i—Rb1—Ow2	120.28 (3)	O2^iv—Rb2—Ow1^vii	107.00 (3)
O1^i—Rb1—Ow2^ii	70.39 (3)	O2^iv—Rb2—Ow1^v	130.23 (2)
O2^ii—Rb1—O3	72.56 (3)	O2^iv—Rb2—Ow2^viii	46.98 (2)
O2^ii—Rb1—O4^iii	95.39 (3)	O2^iv—Rb2—Ow2^ii	69.59 (3)
O2^ii—Rb1—Ow1	146.33 (2)	O2^v—Rb2—O3	87.75 (3)
O2^ii—Rb1—Ow1^ii	52.04 (2)	O2^v—Rb2—O3^ii	124.45 (3)
O2^ii—Rb1—Ow2	74.34 (3)	O2^v—Rb2—O4	85.12 (3)
O2^ii—Rb1—Ow2^ii	106.64 (3)	O2^v—Rb2—O4^vi	96.32 (3)
O3—Rb1—O4^iii	128.46 (3)	O2^v—Rb2—Ow1^vii	136.26 (3)
O3—Rb1—Ow1	73.87 (3)	O2^v—Rb2—Ow1^v	49.93 (2)
O3—Rb1—Ow1^ii	123.27 (3)	O2^v—Rb2—Ow2^viii	71.38 (3)
O3—Rb1—Ow2	77.23 (3)	O2^v—Rb2—Ow2^ii	51.72 (3)
O3—Rb1—Ow2^ii	89.07 (3)	O3—Rb2—O3^ii	75.33 (3)
O4^iii—Rb1—Ow1	103.35 (3)	O3—Rb2—O4	47.55 (2)
O4^iii—Rb1—Ow1^ii	73.58 (3)	O3—Rb2—O4^vi	140.94 (2)
O4^iii—Rb1—Ow2	51.49 (2)	O3—Rb2—Ow1^vii	101.94 (3)
O4^iii—Rb1—Ow2^ii	141.22 (2)	O3—Rb2—Ow1^v	84.41 (3)
Ow1—Rb1—Ow1^ii	160.80 (2)	O3—Rb2—Ow2^viii	158.72 (3)
Ow1—Rb1—Ow2	95.79 (3)	O3—Rb2—Ow2^ii	76.91 (3)
Ow1—Rb1—Ow2^ii	75.25 (3)	O3^ii—Rb2—O4	115.75 (3)
Ow1^ii—Rb1—Ow2	96.63 (3)	O3^ii—Rb2—O4^vi	129.53 (3)
Ow1^ii—Rb1—Ow2^ii	95.13 (3)	O3^ii—Rb2—Ow1^vii	99.18 (3)
Ow2—Rb1—Ow2^ii	165.39 (3)	O3^ii—Rb2—Ow1^v	159.44 (4)
O1^iv—Rb2—O1^ii	76.36 (3)	O3^ii—Rb2—Ow2^viii	112.75 (3)
O1^iv—Rb2—O2^iv	46.71 (2)	O3^ii—Rb2—Ow2^ii	72.86 (3)
O1^iv—Rb2—O2^v	141.25 (2)	O4—Rb2—O4^vi	93.96 (3)
O1^iv—Rb2—O3	115.55 (3)	O4—Rb2—Ow1^vii	71.96 (3)
O1^iv—Rb2—O3^ii	45.24 (3)	O4—Rb2—Ow1^v	48.42 (2)
O1^iv—Rb2—O4	133.58 (2)	O4—Rb2—Ow2^viii	131.27 (3)
O1^iv—Rb2—O4^vi	84.53 (3)	O4—Rb2—Ow2^ii	111.66 (3)
O1^iv—Rb2—Ow1^vii	71.69 (3)	O4^vi—Rb2—Ow1^vii	50.58 (3)
O1^iv—Rb2—Ow1^v	153.78 (3)	O4^vi—Rb2—Ow1^v	69.54 (3)
O1^iv—Rb2—Ow2^viii	80.58 (3)	O4^vi—Rb2—Ow2^viii	49.35 (2)
O1^iv—Rb2—Ow2^ii	101.52 (3)	O4^vi—Rb2—Ow2^ii	134.32 (3)
O1^ii—Rb2—O2^iv	115.48 (3)	Ow1^vii—Rb2—Ow1^v	88.23 (3)
O1^ii—Rb2—O2^v	130.85 (3)	Ow1^vii—Rb2—Ow2^viii	96.24 (3)
O1^ii—Rb2—O3	43.29 (3)	Ow1^vii—Rb2—Ow2^ii	172.02 (3)
O1^ii—Rb2—O3^ii	51.43 (3)	Ow1^v—Rb2—Ow2^viii	85.19 (3)
O1^ii—Rb2—O4	65.91 (3)	Ow2^viii—Rb2—Ow2^ii	86.58 (3)
O1^ii—Rb2—O4^vi	123.19 (3)	O1—As—O2	107.85 (6)
O1^ii—Rb2—Ow1^vii	72.62 (3)	O1—As—O3	106.88 (5)
O1^ii—Rb2—Ow1^v	114.28 (3)	O1—As—O4	104.38 (5)
O1^ii—Rb2—Ow2^viii	156.56 (3)	O2—As—O3	110.33 (5)
O1^ii—Rb2—Ow2^ii	102.01 (3)	O3—As—O4	111.73 (6)

Symmetry codes: (i) x+1, y, z+1; (ii) x, −y+3/2, z+1/2; (iii) x+1, −y+3/2, z+1/2; (iv) x, y, z+1; (v) −x+1, −y+2, −z+1; (vi) −x, −y+2, −z+1; (vii) x−1, y, z; (viii) −x+1, y+1/2, −z+3/2.

Hydrogen-bond geometry (Å, º)

D—H···A	D—H	H···A	D···A	D—H···A
O1—H1···O3^ix	0.85 (2)	1.68 (2)	2.5173 (19)	167.3 (17)
Ow1—Hw11···O2	0.850 (12)	1.894 (12)	2.7122 (13)	161 (2)
Ow1—Hw12···O4^v	0.850 (12)	1.866 (11)	2.6957 (14)	165.0 (19)
Ow2—Hw21···O4^iii	0.850 (9)	1.929 (12)	2.7137 (13)	153 (2)
Ow2—Hw22···O2^x	0.850 (14)	1.873 (13)	2.6920 (14)	161.3 (19)

Symmetry codes: (iii) x+1, −y+3/2, z+1/2; (v) −x+1, −y+2, −z+1; (ix) x, −y+3/2, z−1/2; (x) −x+1, y−1/2, −z+1/2.

(Rb2HPO4.2H2O) Dirubidium monohydrogen phosphate(V) dihydrate

Crystal data

Rb2HPO4·2H2O	F(000) = 568
Mr = 302.9	Dx = 2.935 Mg m^−3
Monoclinic, P21/c	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ybc	Cell parameters from 9938 reflections
a = 7.3640 (7) Å	θ = 3.0–32.7°
b = 13.6496 (13) Å	µ = 14.48 mm^−1
c = 7.7341 (8) Å	T = 100 K
β = 118.176 (2)°	Plate, clear colourless
V = 685.28 (12) Å^3	0.11 × 0.08 × 0.01 mm
Z = 4

Data collection

Bruker Kappa APEXII CCD diffractometer	2521 independent reflections
Radiation source: X-ray tube	2082 reflections with I > 3σ(I)
Graphite monochromator	Rint = 0.060
ω and φ scans	θmax = 32.7°, θmin = 3.0°
Absorption correction: multi-scan (SADABS; Bruker, 2013)	h = −11→11
Tmin = 0.26, Tmax = 0.87	k = −20→20
31969 measured reflections	l = −11→11

Refinement

Refinement on F	Hydrogen site location: difference Fourier map
R[F > 3σ(F)] = 0.030	All H-atom parameters refined
wR(F) = 0.039	Weighting scheme based on measured s.u.'s w = 1/(σ^2(F) + 0.0001F^2)
S = 1.87	(Δ/σ)max = 0.027
2521 reflections	Δρmax = 2.11 e Å^−3
103 parameters	Δρmin = −1.57 e Å^−3
4 restraints	Extinction correction: B-C type 1 Gaussian isotropic (Becker & Coppens, 1974)
0 constraints	Extinction coefficient: 670 (70)
Primary atom site location: isomorphous structure methods

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Ų)

	x	y	z	Uiso*/Ueq
Rb1	0.75415 (3)	0.734074 (18)	0.75918 (4)	0.00688 (10)
Rb2	0.26528 (4)	0.918714 (18)	0.74357 (4)	0.00941 (10)
P	0.26995 (10)	0.85369 (5)	0.26065 (10)	0.0047 (2)
O1	0.1533 (3)	0.79367 (15)	0.0608 (3)	0.0112 (7)
O2	0.4268 (3)	0.91989 (13)	0.2439 (3)	0.0088 (7)
O3	0.3772 (3)	0.77962 (14)	0.4260 (3)	0.0110 (7)
O4	0.1007 (3)	0.90850 (13)	0.2795 (3)	0.0087 (7)
Ow1	0.8083 (3)	0.91058 (15)	0.5621 (3)	0.0098 (7)
Ow2	0.7191 (3)	0.58570 (15)	0.4683 (3)	0.0105 (7)
Hw21	0.8439 (19)	0.583 (2)	0.557 (4)	0.019 (10)*
H1	0.244 (5)	0.764 (3)	0.016 (6)	0.053 (17)*
Hw11	0.686 (3)	0.908 (3)	0.468 (5)	0.047 (15)*
Hw22	0.685 (7)	0.5334 (19)	0.401 (6)	0.055 (16)*
Hw12	0.832 (7)	0.961 (2)	0.635 (6)	0.060 (16)*

Atomic displacement parameters (Ų)

	U^11	U^22	U^33	U^12	U^13	U^23
Rb1	0.00794 (12)	0.00754 (12)	0.00307 (13)	−0.00039 (8)	0.00087 (10)	0.00014 (9)
Rb2	0.00866 (13)	0.00773 (13)	0.00925 (14)	−0.00021 (9)	0.00208 (10)	0.00055 (10)
P	0.0060 (3)	0.0052 (3)	0.0022 (3)	0.0000 (2)	0.0012 (2)	0.0003 (2)
O1	0.0090 (9)	0.0155 (10)	0.0070 (10)	−0.0006 (7)	0.0020 (8)	−0.0063 (8)
O2	0.0089 (9)	0.0088 (9)	0.0083 (10)	−0.0003 (7)	0.0039 (8)	0.0026 (7)
O3	0.0099 (9)	0.0119 (9)	0.0091 (10)	0.0010 (7)	0.0027 (8)	0.0058 (8)
O4	0.0091 (9)	0.0095 (9)	0.0072 (9)	0.0003 (7)	0.0037 (8)	−0.0029 (7)
Ow1	0.0098 (9)	0.0093 (10)	0.0084 (10)	0.0002 (7)	0.0028 (8)	−0.0031 (7)
Ow2	0.0092 (9)	0.0105 (10)	0.0102 (10)	−0.0001 (7)	0.0031 (8)	−0.0036 (8)

Geometric parameters (Å, º)

Rb1—O1^i	2.8753 (18)	Rb2—O3	3.497 (3)
Rb1—O2^ii	3.158 (2)	Rb2—O3^ii	2.983 (2)
Rb1—O3	2.8246 (18)	Rb2—O4	3.204 (2)
Rb1—O3^ii	3.576 (3)	Rb2—O4^vi	3.522 (2)
Rb1—O4^iii	3.154 (2)	Rb2—Ow1^vii	2.974 (2)
Rb1—Ow1	2.977 (2)	Rb2—Ow1^v	3.178 (2)
Rb1—Ow1^ii	2.943 (2)	Rb2—Ow2^viii	3.151 (2)
Rb1—Ow2	2.946 (2)	Rb2—Ow2^ii	2.951 (2)
Rb1—Ow2^ii	3.021 (2)	P—O1	1.595 (2)
Rb2—O1^iv	3.395 (3)	P—O2	1.520 (2)
Rb2—O1^ii	3.159 (2)	P—O3	1.525 (2)
Rb2—O2^iv	3.470 (2)	P—O4	1.518 (2)
Rb2—O2^v	3.130 (2)
O1^i—Rb1—O2^ii	133.50 (6)	O1^ii—Rb2—Ow1^v	115.03 (6)
O1^i—Rb1—O3	149.97 (6)	O1^ii—Rb2—Ow2^viii	153.46 (7)
O1^i—Rb1—O3^ii	113.10 (6)	O1^ii—Rb2—Ow2^ii	103.22 (5)
O1^i—Rb1—O4^iii	68.96 (6)	O2^iv—Rb2—O2^v	95.75 (5)
O1^i—Rb1—Ow1	81.59 (6)	O2^iv—Rb2—O3	135.67 (4)
O1^i—Rb1—Ow1^ii	80.88 (6)	O2^iv—Rb2—O3^ii	66.68 (5)
O1^i—Rb1—Ow2	120.10 (6)	O2^iv—Rb2—O4	177.07 (5)
O1^i—Rb1—Ow2^ii	69.41 (6)	O2^iv—Rb2—O4^vi	84.53 (5)
O2^ii—Rb1—O3	73.04 (6)	O2^iv—Rb2—Ow1^vii	104.02 (6)
O2^ii—Rb1—O3^ii	43.10 (5)	O2^iv—Rb2—Ow1^v	132.40 (5)
O2^ii—Rb1—O4^iii	100.18 (5)	O2^iv—Rb2—Ow2^viii	47.89 (5)
O2^ii—Rb1—Ow1	143.51 (5)	O2^iv—Rb2—Ow2^ii	69.30 (7)
O2^ii—Rb1—Ow1^ii	52.95 (5)	O2^v—Rb2—O3	89.79 (6)
O2^ii—Rb1—Ow2	73.96 (7)	O2^v—Rb2—O3^ii	126.14 (5)
O2^ii—Rb1—Ow2^ii	107.77 (7)	O2^v—Rb2—O4	87.17 (5)
O3—Rb1—O3^ii	75.21 (6)	O2^v—Rb2—O4^vi	93.21 (5)
O3—Rb1—O4^iii	127.21 (6)	O2^v—Rb2—Ow1^vii	133.04 (5)
O3—Rb1—Ow1	70.50 (6)	O2^v—Rb2—Ow1^v	51.22 (5)
O3—Rb1—Ow1^ii	125.40 (6)	O2^v—Rb2—Ow2^viii	71.63 (7)
O3—Rb1—Ow2	76.15 (6)	O2^v—Rb2—Ow2^ii	52.68 (5)
O3—Rb1—Ow2^ii	90.78 (6)	O3—Rb2—O3^ii	74.66 (6)
O3^ii—Rb1—O4^iii	134.24 (5)	O3—Rb2—O4	43.89 (5)
O3^ii—Rb1—Ow1	122.79 (6)	O3—Rb2—O4^vi	139.16 (4)
O3^ii—Rb1—Ow1^ii	60.95 (6)	O3—Rb2—Ow1^vii	103.75 (6)
O3^ii—Rb1—Ow2	115.87 (6)	O3—Rb2—Ow1^v	83.66 (6)
O3^ii—Rb1—Ow2^ii	64.68 (6)	O3—Rb2—Ow2^viii	161.31 (6)
O4^iii—Rb1—Ow1	102.94 (7)	O3—Rb2—Ow2^ii	79.97 (6)
O4^iii—Rb1—Ow1^ii	75.17 (7)	O3^ii—Rb2—O4	111.36 (5)
O4^iii—Rb1—Ow2	52.48 (5)	O3^ii—Rb2—O4^vi	131.72 (6)
O4^iii—Rb1—Ow2^ii	138.37 (5)	O3^ii—Rb2—Ow1^vii	100.82 (6)
Ow1—Rb1—Ow1^ii	161.79 (5)	O3^ii—Rb2—Ow1^v	158.28 (7)
Ow1—Rb1—Ow2	98.63 (7)	O3^ii—Rb2—Ow2^viii	114.35 (6)
Ow1—Rb1—Ow2^ii	71.41 (7)	O3^ii—Rb2—Ow2^ii	73.73 (6)
Ow1^ii—Rb1—Ow2	94.40 (7)	O4—Rb2—O4^vi	95.56 (5)
Ow1^ii—Rb1—Ow2^ii	97.69 (7)	O4—Rb2—Ow1^vii	74.01 (7)
Ow2—Rb1—Ow2^ii	165.84 (5)	O4—Rb2—Ow1^v	49.99 (5)
O1^iv—Rb2—O1^ii	76.16 (6)	O4—Rb2—Ow2^viii	133.78 (5)
O1^iv—Rb2—O2^iv	43.01 (4)	O4—Rb2—Ow2^ii	112.53 (7)
O1^iv—Rb2—O2^v	138.69 (5)	O4^vi—Rb2—Ow1^vii	48.15 (5)
O1^iv—Rb2—O3	116.94 (5)	O4^vi—Rb2—Ow1^v	67.28 (6)
O1^iv—Rb2—O3^ii	46.31 (6)	O4^vi—Rb2—Ow2^viii	47.40 (4)
O1^iv—Rb2—O4	134.06 (5)	O4^vi—Rb2—Ow2^ii	132.09 (5)
O1^iv—Rb2—O4^vi	86.10 (5)	Ow1^vii—Rb2—Ow1^v	85.34 (6)
O1^iv—Rb2—Ow1^vii	73.47 (6)	Ow1^vii—Rb2—Ow2^viii	90.92 (6)
O1^iv—Rb2—Ow1^v	153.11 (6)	Ow1^vii—Rb2—Ow2^ii	172.54 (7)
O1^iv—Rb2—Ow2^viii	78.04 (6)	Ow1^v—Rb2—Ow2^viii	86.11 (6)
O1^iv—Rb2—Ow2^ii	99.09 (6)	Ow1^v—Rb2—Ow2^ii	101.60 (6)
O1^ii—Rb2—O2^iv	112.50 (5)	Ow2^viii—Rb2—Ow2^ii	86.85 (6)
O1^ii—Rb2—O2^v	133.80 (7)	O1—P—O2	107.83 (13)
O1^ii—Rb2—O3	44.43 (6)	O1—P—O3	107.49 (11)
O1^ii—Rb2—O3^ii	48.27 (5)	O1—P—O4	104.77 (11)
O1^ii—Rb2—O4	65.05 (5)	O2—P—O3	110.61 (11)
O1^ii—Rb2—O4^vi	124.05 (5)	O3—P—O4	111.70 (14)
O1^ii—Rb2—Ow1^vii	75.90 (6)

Symmetry codes: (i) x+1, y, z+1; (ii) x, −y+3/2, z+1/2; (iii) x+1, −y+3/2, z+1/2; (iv) x, y, z+1; (v) −x+1, −y+2, −z+1; (vi) −x, −y+2, −z+1; (vii) x−1, y, z; (viii) −x+1, y+1/2, −z+3/2.

Hydrogen-bond geometry (Å, º)

D—H···A	D—H	H···A	D···A	D—H···A
O1—H1···O3^ix	0.97 (5)	1.56 (5)	2.536 (4)	175 (3)
Ow1—Hw11···O2	0.850 (19)	1.88 (2)	2.727 (2)	171 (4)
Ow1—Hw12···O4^v	0.85 (3)	1.89 (3)	2.697 (3)	159 (5)
Ow2—Hw21···O4^iii	0.850 (14)	1.864 (17)	2.704 (3)	169 (3)
Ow2—Hw22···O2^x	0.85 (3)	1.86 (3)	2.703 (3)	171 (5)

Symmetry codes: (iii) x+1, −y+3/2, z+1/2; (v) −x+1, −y+2, −z+1; (ix) x, −y+3/2, z−1/2; (x) −x+1, y−1/2, −z+1/2.