You are an expert in photocatalysis. For the following 3D structure, what is its reduction potential for PC/PC•– conversion measured against SCE? Please answer in a single float number.
97

Cu        13.74070        7.49650        2.96710
P         11.83910        6.78620        1.99340
P         14.99930        9.25940        2.43490
O         14.79370        5.62590        3.60190
O         13.71870        6.84370        5.05530
O         21.78120        7.11180        8.69370
C         11.11660        5.26120        2.69700
C         11.06610        5.15130        4.06630
H         11.43440        5.83410        4.61400
C         10.47010        4.03180        4.64530
H         10.43120        3.96090        5.59180
C          9.94210        3.03650        3.87880
H          9.52490        2.28730        4.28690
C         10.01890        3.12460        2.52430
H          9.66910        2.42310        1.98810
C         10.60540        4.23720        1.91110
H         10.65270        4.29090        0.96410
C         12.10960        6.36680        0.24560
C         13.26840        5.67510       -0.08190
H         13.85440        5.38190        0.60610
C         13.57090        5.41210       -1.39020
H         14.36050        4.92730       -1.59860
C         12.74470        5.84130       -2.41270
H         12.97830        5.67810       -3.31940
C         11.58400        6.50480       -2.10310
H         10.99640        6.77910       -2.79700
C         11.26970        6.77510       -0.79030
H         10.46910        7.24540       -0.58790
C         10.41750        7.93120        1.96910
C          9.10640        7.48850        1.87840
H          8.92550        6.55750        1.81500
C          8.05970        8.39360        1.87690
H          7.16620        8.07880        1.80560
C          8.29860        9.73900        1.97810
H          7.57670       10.35720        1.97520
C          9.59180       10.18550        2.08520
H          9.76740       11.11590        2.15910
C         10.64010        9.28270        2.08380
H         11.53160        9.60360        2.16420
C         13.99940       10.78040        2.47970
C         13.47870       11.16820        3.70160
H         13.75670       10.71280        4.48780
C         12.57240       12.19250        3.81030
H         12.21630       12.43270        4.65760
C         12.18150       12.87070        2.66870
H         11.55380       13.58120        2.72720
C         12.69760       12.51790        1.46460
H         12.42920       12.99010        0.68500
C         13.60840       11.48120        1.35000
H         13.96510       11.25220        0.50000
C         15.75590        9.23610        0.77690
C         15.05660        8.65370       -0.27090
H         14.17750        8.32450       -0.12050
C         15.61890        8.54420       -1.53300
H         15.12410        8.14930       -2.24200
C         16.88530        9.00360       -1.75930
H         17.27860        8.92130       -2.61950
C         17.58020        9.58060       -0.74120
H         18.46060        9.90140       -0.89830
C         17.03050        9.70900        0.51050
H         17.52930       10.12720        1.20180
C         16.39170        9.64390        3.54680
C         16.91190       10.91620        3.68380
H         16.51850       11.64090        3.21140
C         17.99610       11.14160        4.49790
H         18.34480       12.02110        4.58930
C         18.57670       10.10660        5.17960
H         19.33090       10.26570        5.73550
C         18.07250        8.84890        5.06050
H         18.47930        8.12970        5.52870
C         16.97200        8.61090        4.26130
H         16.61080        7.73320        4.20090
C         14.37790        5.83940        4.76140
C         14.75410        4.83550        5.86730
H         15.08420        4.03450        5.36710
C         16.00050        5.36710        6.58170
C         15.87980        6.51080        7.38390
H         15.02130        6.89310        7.52170
C         16.96060        7.08480        7.96740
H         16.84530        7.86030        8.50420
C         18.25460        6.54820        7.79170
C         18.37590        5.35740        7.03710
C         17.22550        4.81310        6.43280
H         17.31300        4.03040        5.90190
C         19.38990        7.15580        8.36780
H         19.29650        7.96280        8.85910
C         20.60770        6.59330        8.22040
C         20.73310        5.39190        7.50150
H         21.59160        4.99550        7.41250
C         19.66450        4.78200        6.92850
H         19.78230        3.96810        6.45340
C         21.71320        8.36250        9.38280
H         21.37680        9.05310        8.77420
H         21.10830        8.28120       10.15000
C         13.71370        4.33670        6.65910
H         13.33070        5.06630        7.19110
H         13.02010        3.95320        6.08410


Answer: -1.56