Table 1.

Minimum inhibitory concentration (MIC) of POMs against the M. catarrhalis (ATCC 23246).

POM	Abbreviation	Charge number (z)	z/m*	MIC, μg/ml
HETEROPOLYANIONS
	Preyssler POT (Figure 1A)
(NH4)14[NaP5W30O110]·30H2O	P5${\text{W}}_{30}^{14-}$	−14	0.47	1
	Dawson-based (Figure 1B)
K6[P2W18O62]·14H2O	P2${\text{W}}_{18}^{6-}$	−6	0.33	2
[N(CH3)4]6[H3P2W15V3O62]·6H2O	P2W15${\text{V}}_3^{6-}$	−6	0.33	2
[(C16H36)4N]4[P4Mo18O61]	P2O7${\text{Mo}}_{18}^{4-}$	−4	0.22	4
(CH6N3)6[As2Mo18O62]·9H2O	As2${\text{Mo}}_{18}^{6-}$	−6	0.33	4
Na7[AsW18O60]·16H2O	${\text{AsW}}_{18}^{7-}$	−7	0.39	8
(NH4)6[P2Mo18O62]·12H2O	P2${\text{Mo}}_{18}^{6-}$	−6	0.33	>256
[(CH3)4N]4[S2Mo18O62]	S2${\text{Mo}}_{18}^{4-}$	−4	0.22	>256
Na12[P2W15O56]·25H2O	P2${\text{W}}_{15}^{12-}$	−12	0.8	>256
K6[As2W18O62]·14H2O	As2${\text{W}}_{18}^{6-}$	−6	0.33	>256
	Keggin-based (Figures 1C-F)
K6H2[CoTiW11O40]·13H2O	${\text{CoTiW}}_{11}^{6-}$	−6	0.45	16
K8[SiW10O36]·10H2O	${\text{SiW}}_{10}^{8-}$	−8	0.8	32
Na3[PW12O40]·12H2O	${\text{PW}}_{12}^{3-}$	−3	0.25	128
Na9[SbW9O33]·19.5H2O	${\text{SbW}}_9^{9-}$	−9	1	256
Na9[AsW9O33]·19.5H2O	${\text{AsW}}_9^{9-}$	−9	1	>256
(NH4)5[H2PCoW11O40]	${\text{PCoW}}_{11}^{5-}$	−5	0.45	>256
	POTs based on lacunary Keggin units
K14[As2W19O67(H2O)]	As2${\text{W}}_{19}^{14-}$	−14	0.74	64
K9(C2H8N)5[H10Se2W29O103]·30H2O	Se2${\text{W}}_{29}^{14-}$	−14	0.48	64
	Anderson-based (Figure 1I)
Na6[TeW6O24]·22H2O	${\text{TeW}}_6^{6-}$	−6	1	>256
Na4[Ni(OH)6W6O18]·16H2O	${\text{NiW}}_6^{4-}$	−4	0.67	>256
Na4[Ni(OH)6Mo6O18]·16H2O	${\text{NiMo}}_6^{4-}$	−4	0.67	>256
Na2[N(CH3)4]2[Ni(OH)3W6O18(OCH2)3CCH2OH]·9H2O	NiW6penta4−	−4	0.67	>256
ISOPOLYANIONS (FIGURES 1G,H)
[(C4H9)4N]4[α-Mo8O26]	${\text{Mo}}_8^{4-}$	−4	0.5	32
Na10[W12O40(OH)2]·27H2O	${\text{W}}_{12}^{10-}$	−10	0.45	64
Na12[H4W22O74]·31H2O	${\text{W}}_{22}^{12-}$	−12	0.54	128
[(C4H9)4N]2[Mo6O19]	${\text{Mo}}_6^{2-}$	−2	0.33	>256
K4Na2[V10O28]·10H2O	${\text{V}}_{10}^{6-}$	−6	0.6	>256
K4[V4O8(L-tart)2]·8H2O, tart = C4H2${\text{O}}_6^{4-}$	V4-L-tart4−	−4	1	256
K4[V4O8(D-tart)2]·8H2O, tart = C4H2${\text{O}}_6^{4-}$	V4-D-tart4−	−4	1	>256
POSITIVE CONTROL
Azithromycin (Lode et al., 1996)				0.06

POMs combined in groups according to their structural type and within the group listed from higher to lower activity.

^*m - number of addenda atoms.