Table 1. Selected geometric parameters (Å, °).

Pb—I2	3.0689 (9)	Pb—I4	3.2396 (9)
Pb—I3	3.1511 (9)	Pb—I4ii	3.3535 (9)
Pb—I1	3.2173 (8)	I4—Pbiii	3.3535 (9)
Pb—I1i	3.2173 (8)	OW—HW2	0.86 (2)
I2—Pb—I3	96.06 (3)	I1—Pb—I4	87.185 (13)
I2—Pb—I1	85.021 (12)	I1i—Pb—I4	87.185 (13)
I3—Pb—I1	93.943 (13)	I2—Pb—I4ii	179.99 (3)
I2—Pb—I1i	85.022 (12)	I3—Pb—I4ii	83.95 (3)
I3—Pb—I1i	93.944 (13)	I1—Pb—I4ii	94.978 (12)
I1—Pb—I1i	167.89 (2)	I1i—Pb—I4ii	94.977 (12)
I2—Pb—I4	96.89 (3)	I4—Pb—I4ii	83.105 (14)
I3—Pb—I4	167.05 (3)	Pb—I4—Pbiii	178.91 (3)

Symmetry codes: (i) ; (ii) ; (iii) .