Reactivity of a Series of Isostructural Cobalt Pincer Complexes with CO 2, CO, and H +

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1 Supporting Information Reactivity of a Series of Isostructural Cobalt Pincer Complexes with CO 2, CO, and H + David W. Shaffer, Samantha I. Johnson,, Arnold L. Rheingold, Joseph W. Ziller, William A. Goddard, III,, Robert J. Nielsen,, and Jenny Y. Yang *, Department of Chemistry, University of California, Irvine, 1102 Natural Sciences 2, Irvine, California 92697, United States Joint Center for Artificial Photosynthesis, California Institute of Technology, Pasadena, California 91125, United States Department of Chemistry, California Institute of Technology, Pasadena, California 91125, United States Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, United States Table S1. X-ray Diffraction Data Collection and Refinement Parameters... S2 Figure S1. ORTEP diagram of [(P C N C P)Co(NCCH 3 )(BF 4 )][BF 4 ] (1a)... S3 Figure S2. Cyclic voltammograms of the first reductions of [(P E N E P)Co(NCCH 3 ) 2 ][BF 4 ] 2 (E = C, 1a; N, 1b; O, 1c) under N 2 at various scan rates.... S3 Figure S3. Cyclic voltammograms of the second reductions of [(P E N E P)Co(NCCH 3 ) 2 ][BF 4 ] 2 (E = C, 1a; N, 1b; O, 1c) under N 2 at various scan rates.... S4 Figure S4. Cyclic voltammograms of the first reductions of [(P E N E P)Co(NCCH 3 ) 2 ][BF 4 ] 2 (E = C, 1a; N, 1b; O, 1c) under CO 2 at various scan rates.... S4 Figure S5. Cyclic voltammograms of 8 mm [HNEt 3 ][BF 4 ] alone in CH 3 CN with 0.20 M Bu 4 NPF 6 at a glassy carbon electrode and with 1 mm [(P C N C P)Co(NCCH 3 ) 2 ][BF 4 ] 2 under 1 atm CO S5 Isolation of Proposed [(P C N C P)Co(CO)][BF 4 ].... S5 Figure S6. Cyclic voltammograms of the first reduction of [(P C N C P)Co(NCCH 3 ) 2 ][BF 4 ] 2 (1a) in CH 3 CN upon sequential addition of increasingly strong acids.... S6 Figure S7. 1 H NMR spectrum of [(P C N C P)Co(NCCH 3 )][BF 4 ] (2a) in CD 3 CN.... S7 Figure S8. 1 H NMR spectrum of [(P N N N P)Co(NCCH 3 )][BF 4 ] (2b) in CD 3 CN.... S8 Figure S9. 1 H NMR spectrum of [(P O N O P)Co(NCCH 3 )][BF 4 ] (2c) in CD 3 CN.... S9 Figure S10. ORTEP diagram of [(P C N C P)Co(NCCH 3 )][BF 4 ] (2a).... S10 Figure S11. Spin density plot of [(P C N C P)Co(NCCH 3 ) 2 ] S10 Table S2. Calculated geometries of Co complexes by DFT.... S10 Table S3. Calculations for DFT energies.... S46 S1

2 Table S1. X-ray Diffraction Data Collection and Refinement Parameters [(P C N C P)Co(NCCH 3 ) (BF 4 )][BF 4 ] (1a) [(P C N C P)Co(NCC H 3 ) 2 ][BPh 4 ] 2 (1a ) [(P N N N P)Co(CH 3 CN) 2 ] (BF 4 ) 2 (1b) [(P C N C P)Co(NCCH 3 )] [BF 4 ] (2a) [(P N N N P)Co(NCCH 3 )] [BF 4 ] (2b) Empirical formula Formula weight Crystal system Space group C 25 H 46 B 2 CoF 8 N 2 P 2 C 77 H 92 B 2 CoN 4 P 2 C 27 H 50 B 2 CoF 8 N 6 P 2 C 26 H 46 BCoF 4 NP 2 C 23 H 44 BCoF 4 N 4 P Monoclinic Triclinic Monoclinic Triclinic Orthorhombic C2/c P1 P2 1 /n P1 Pnma a / Å (6) (8) (4) (18) (2) b / Å (19) (8) (9) (2) (3) c / Å (4) (12) (5) (5) (4) α / deg (3) (19) 90 β / deg (4) (3) (10) (17) 90 γ / deg (3) (17) 90 V / Å (2) (3) (2) (16) 11655(3) Z Refl. Collected Indep. Refl R1 (I > 2σ) a wr2 (all data) b a R1 = F o F c F o. b wr2 = { [w(f o 2 F c 2 ) 2 ] [w(f o 2 ) 2 ]} 1/2. S2

3 Figure S1. ORTEP diagram of [(P C N C P)Co(NCCH 3 )(BF 4 )][BF 4 ] (1a). Ellipsoids are shown at 50% probability. Hydrogen atoms and outer-sphere BF 4 anion have been omitted for clarity. I ν 1/2 / A s 1/2 mv 1/2 1a (N 2 ) 1b (N 2 ) 25 mv/s 50 mv/s 100 mv/s 200 mv/s 400 mv/s 800 mv/s 1600 mv/s 1c (N 2 ) E / V vs FeCp +/ E / V vs FeCp 2 +/ E / V vs FeCp 2 +/0 Figure S2. Cyclic voltammograms of the first reductions of [(P E N E P)Co(NCCH 3 ) 2 ][BF 4 ] 2 (E = C, 1a, left; N, 1b, middle; O, 1c, right) under N 2 at various scan rates. Current is normalized by square-root of scan rate. 1.0 mm analyte in CH 3 CN with 0.20 M Bu 4 NBF 4. Arrows indicate the scan direction and the position of the bulk material. S3

4 1a (N 2 ) 1b (N 2 ) 1c (N 2 ) I ν 1/2 / A s 1/2 mv 1/ mv/s 25 mv/s 50 mv/s 100 mv/s 200 mv/s 400 mv/s 800 mv/s 1600 mv/s E / V vs FeCp +/ E / V vs FeCp +/ E / V vs FeCp 2 +/0 Figure S3. Cyclic voltammograms of the second reductions of [(P E N E P)Co(NCCH 3 ) 2 ][BF 4 ] 2 (E = C, 1a, left; N, 1b, middle; O, 1c, right) under N 2 at various scan rates. Current is normalized by square-root of scan rate. 1.0 mm analyte in CH 3 CN with 0.20 M Bu 4 NBF 4. Arrows indicate the scan direction. I ν 1/2 / A s 1/2 mv 1/ mv/s 25 mv/s 50 mv/s 100 mv/s 200 mv/s 400 mv/s 800 mv/s 1600 mv/s 1a (CO ) 1b (CO ) 1c (CO ) E / V vs FeCp +/ E / V vs FeCp 2 +/ E / V vs FeCp 2 +/0 Figure S4. Cyclic voltammograms of the first reductions of [(P E N E P)Co(NCCH 3 ) 2 ][BF 4 ] 2 (E = C, 1a, left; N, 1b, middle; O, 1c, right) under CO 2 at various scan rates. Current is normalized by square-root of scan rate. 1.0 mm analyte in CH 3 CN with 0.20 M Bu 4 NBF 4. Arrows indicate the scan direction and the position of the bulk material. S4

5 I / ma E / V vs FeCp +/0 2 Figure S5. Cyclic voltammograms of 8 mm [HNEt 3 ][BF 4 ] alone in CH 3 CN with 0.20 M Bu 4 NPF 6 at a glassy carbon electrode (dotted black line) and with 1 mm [(P C N C P)Co(NCCH 3 ) 2 ][BF 4 ] 2 (1a) under 1 atm CO 2 (solid red line). Isolation of Proposed [(P C N C P)Co(CO)][BF 4 ]. A dark orange solution of 1a (108.3 mg, μmol) in 4 ml THF and 1 ml CH 3 CN was frozen, and then solid KC 8 (22.0 mg, μmol) was added to the just-thawed solution. After stirring 1.5 h, 5 ml diethyl ether was added to the dark green solution to promote precipitation of KBF 4 and the suspension was filtered. The resulting solution of 2a was freeze-pump-thawed two times, then stirred under 1 atm CO for 1 h, resulting in an orange solution. Removal of the solvent in vacuo provided a brown solid, which was washed with diethyl ether, filtered, and dried in vacuo (yield 82.0 mg). 1 H NMR (CD 3 CN) δ/ppm: 7.87 (t, 3 J HH = 7.8 Hz, 1H, aryl H), 7.49 (d, 3 J HH = 7.8 Hz, 2H, aryl H), 3.85 (vt, 4H, CH 2 ) 1.43 (vt, 36H, t Bu). 13 C{ 1 H} NMR (126 MHz, CD 3 CN) δ/ppm: (t, 2 J CP = 7.2 Hz), 141.9, (t, 3 J CP = 5.3 Hz), 36.6 (t, 1 J CP = 9.8 Hz), 35.1 (t, 2 J CP = 8.3 Hz), 29.4 (br t). 31 P{ 1 H} NMR (162 MHz, CD 3 CN) δ/ppm: 86.5 (br s, P t Bu 2 ). IR (solid) υ max /cm 1 : 1918 (C O), 1875 (weak). IR (CH 3 CN with 0.20 M Bu 4 NBF 4 ) υ max /cm 1 : 1920 (C O). S5

6 I / mv I / mv I / mv I / mv a + 10 [HDBU][BF 4 ] a + 10 [HDBU][BF 4 ] + 10 [HNEt 3 ][BF 4 ] E / V vs FeCp +/ E / V vs FeCp +/ a + 10 [HDBU][BF 4 ] + 10 [HNEt 3 ][BF 4 ] + 1 [PhNH 3 ][BF 4 ] E / V vs FeCp +/ a + 10 [HDBU][BF 4 ] [HNEt 3 ][BF 4 ] + 1 [PhNH 3 ][BF 4 ] + 1 [HDMF][OTf] E / V vs FeCp +/0 2 Figure S6. Cyclic voltammograms of the first reduction of 1 mm [(P C N C P)Co(NCCH 3 ) 2 ][BF 4 ] 2 (1a) in CH 3 CN with 0.20 M Bu 4 NPF 6 upon sequential addition of increasingly strong acids. S6

7 CH3CN/CD3CN Figure S7. 1 H NMR spectrum of [(P C N C P)Co(NCCH 3 )][BF 4 ] (2a) in CD 3 CN. S7

8 CH3CN/CD3CN Figure S8. 1 H NMR spectrum of [(P N N N P)Co(NCCH 3 )][BF 4 ] (2b) in CD 3 CN. S8

9 C6H6 CH3CN/CD3CN Figure S9. 1 H NMR spectrum of [(P O N O P)Co(NCCH 3 )][BF 4 ] (2c) in CD 3 CN. S9

10 Figure S10. ORTEP diagram of one of four [(P C N C P)Co(NCCH 3 )][BF 4 ] (2a) molecules in the asymmetric unit from a low-quality X-ray structure. Isotropic thermal parameters were used in the refinement. Hydrogen atoms (except CH 2 -) and outer-sphere BF 4 anion have been omitted for clarity. Figure S11. Spin density plot of [(P C N C P)Co(NCCH 3 ) 2 ] 0. Two upward spins on the metal are paired with a downward spin on the pyridine ring, creating a broken-symmetry doublet. Table S2. Calculated geometries of Co complexes by DFT. [(P O N O P)Co II (NCCH 3 ) 2 ] 2+ Co P P O C C S10

11 H C H C H C N O C C H H H C H H H C H H H C C H H H C H H H C H H H C C H H H C H H H C H H S11

12 H C C H H H C H H H C H H H N C C H H H N C C H H H [(P O N O P)Co II (NCCH 3 )] + Co P P O C C H C H C H C N O C C H H S12

13 H C H H H C H H H C C H H H C H H H C H H H C C H H H C H H H C H H H C C H H H C H H H C H S13

14 H H N C C H H H [(P O N O P)Co II (NCCH 3 )CO 2 ] 2+ Co N C C C C C H H H O O P P C C C C C H H H C H H H C H H H C H H H C H S14

15 H H C H H H C H H H C H H H C H H H C H H H C H H H C H H H N C C H H H C O O [(P O N O P)Co I (NCCH 3 ) 2 ] + Co P P O C S15

16 C H C H C H C N O C C H H H C H H H C H H H C C H H H C H H H C H H H C C H H H C H H H C H S16

17 H H C C H H H C H H H C H H H N C C H H H N C C H H H [(P O N O P)Co I (NCCH 3 )] + Co P P O C C H C H C H C N O C C H S17

18 H H C H H H C H H H C C H H H C H H H C H H H C C H H H C H H H C H H H C C H H H C H H H C S18

19 H H H N C C H H H [(P O N O P)Co III (NCCH 3 ) 2 H] 2+ Co N C C C C C H H H O O P P C C C C C H H H C H H H C H H H C H H H C S19

20 H H H C H H H C H H H C H H H C H H H C H H H C H H H C H H H N C C H H H H N C C H H H [(P O N O P)Co I (NCCH 3 )CO 2 ] + S20

21 Co N C C C C C H H H O O P P C C C C C H H H C H H H C H H H C H H H C H H H C H H H C H H H S21

22 C H H H C H H H C H H H C H H H C H H H N C C H H H C O O (P O N O P)Co 0 (NCCH 3 ) 2 (N bound) Co P P O C C H C H C H C N O C S22

23 C H H H C H H H C H H H C C H H H C H H H C H H H C C H H H C H H H C H H H C C H H H C H H S23

24 H C H H H N C C H H H N C C H H H (P O N O P)Co II (η 2 -NCCH 3 ) 2 (C bound) Co N C C C C C H H H O O P P C C C C C H H H C H H H C S24

25 H H H C H H H C H H H C H H H C H H H C H H H C H H H C H H H C H H H C H H H C80 Co P N N81 C Co P C82 C Co N H83 C C Co H84 C C H H85 C C H S25

26 (P O N O P)Co 0 (NCCH 3 )CO 2 Co N C C C C C H H H O O P P C C C C C H H H C H H H C H H H C H H H C H H H C H H H C H H S26

27 H C H H H C H H H C H H H C H H H C H H H N C C H H H C O O [(P O N O P)Co II (NCCH 3 )H] + Co P P O C C H C H C H C N O S27

28 C C H H H C H H H C H H H C C H H H C H H H C H H H C C H H H C H H H C H H H C C H H H C H S28

29 H H C H H H N C C H H H H [(P C N C P)Co II (NCCH 3 ) 2 ] 2+ Co N C C C C C H H H C H H C H H P P C C C C N24 Co N P C H H H C H H H S29

30 C H H H C H H H C H H H C H H H C H H H C H H H C H H H C H H H C H H H C H H H N C74 N Co N C75 N Co N C76 C N N H77 C C N H78 C C H S30

31 H79 C C H C80 C N N H81 C C N H82 C C H H83 C C H [(P C N C P)Co II (NCCH 3 )CO 2 ] 2+ Co N C C C C C H H H C H H C H H P P C C C C C H H H C H H H C H H H C H H H C S31

32 H H H C H H H C H H H C H H H C H H H C H H H C H H H C H H H N C C H H H C O O [(P C N C P)Co I (NCCH 3 ) 2 ] + Co N C C S32

33 C C C H H H C H H C H H P P C C C C C H H H C H H H C H H H C H H H C H H H C H H H C H H H S33

34 C H H H C H H H C H H H C H H H C H H H N C74 N Co N C80 C N N H81 C C N H82 C C H H83 C C H N84 Co N H C85 N Co N C86 C N N H87 C C H H88 C C H H89 C C H [(P C N C P)Co I (NCCH 3 )CO 2 ] + Co N C C C C C H H H C H S34

35 H C H H P P C C C C C H H H C H H H C H H H C H H H C H H H C H H H C H H H C H H H C H H H S35

36 C H H H C H H H C H H H N C C H H H C O O [(P C N C P)Co III (NCCH 3 ) 2 H] 2+ Co N C C C C C H H H C H H C H H P P C C C C C S36

37 H H H C H H H C H H H C H H H C H H H C H H H C H H H C H H H C H H H C H H H C H H H C H H S37

38 H N C C H H H H (P C N C P)Co 0 (NCCH 3 ) 2 (N-bound) Co N C C C C C H H H C H H C H H P P C C C C C H H H C H H H C H H H C H S38

39 H H C H H H C H H H C H H H C H H H C H H H C H H H C H H H C H H H N C74 N Co N C80 C N N H81 C C N H82 C C H H83 C C H N84 Co N H C85 N Co N C86 C N N H87 C C H H88 C C H H89 C C H S39

40 (P C N C P)Co II (η 2 -NCCH 3 ) (C-bound) Co N C C C C C H H H C H H C H H P P C C C C C H H H C H H H C H H H C H H H C H H H C H S40

41 H H C H H H C H H H C H H H C H H H C H H H C H H H C80 Co P N N81 C Co P C82 C Co N H83 C C Co H84 C C H H85 C C H (P C N C P)Co 0 (NCCH 3 )CO 2 Co N C C C C C H H H C H S41

42 H C H H P P C C C C C H H H C H H H C H H H C H H H C H H H C H H H C H H H C H H H C H H H S42

43 C H H H C H H H C H H H N C C H H H C O O [(P C N C P)Co II (NCCH 3 )H] + Co N C C C C C H H H C H H C H H P P C C C C C S43

44 H H H C H H H C H H H C H H H C H H H C H H H C H H H C H H H C H H H C H H H C H H H C H H S44

45 H N C C H H H H S45

46 Table S3. Calculations for DFT energies. S46

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