Structures published

Total: 63

C₈H₁₂IO₈Tc₂

William M. Kerlin Frederic Poineau Paul M. Forster Kenneth R. Czerwinski Alfred P. Sattelberger

Inorganica Chimica Acta (2015) 424, 329-335

a=7.1994(6)Å b=14.5851(13)Å c=7.1586(6)Å

α=90° β=110.9540(10)° γ=90°

I₁₃KTc₈

William M. Kerlin Frederic Poineau Paul M. Forster Kenneth R. Czerwinski Alfred P. Sattelberger

Inorganica Chimica Acta (2015) 424, 329-335

a=8.0018(5)Å b=14.5125(10)Å c=13.1948(9)Å

α=90° β=102.3090(10)° γ=90°

Ni20 ((O H)12 (H2 O)6) (H P O4)8 (P O4)4 (H2 O)12.35

H_56.7Ni₂₀O_78.35P₁₂

Guillou, N.Gao, Q.-M.Chang, J.-S.Forster, P.M.Noques, M.Ferey, G.Cheetham, A.K.Park, S.-E.

Angew. Chem. Int. ed. (2001) 40, 2831-2834

a=18.209Å b=18.209Å c=6.3898Å

α=90° β=90° γ=120°

C₅H₂₁N₃O₁₆P₄Zn₃

Neeraj, S.Forster, P. M.Rao, C. N. R.Cheetham, A. K.

Chemical Communications (2001) 24 2716

a=8.4408(13)Å b=9.2630(16)Å c=13.843(2)Å

α=81.119(15)° β=83.643(12)° γ=72.647(11)°

C₆H_4.5N₂O_18.25P₄Zn₅

Neeraj, S.Forster, P. M.Rao, C. N. R.Cheetham, A. K.

Chemical Communications (2001) 24 2716

a=5.1601(6)Å b=25.075(3)Å c=14.9860(19)Å

α=90.00° β=92.610(2)° γ=90.00°

C₂H₇CoNO₆P_1.5

Neeraj, S.Forster, P. M.Rao, C. N. R.Cheetham, A. K.

Chemical Communications (2001) 24 2716

a=13.444(5)Å b=12.874(5)Å c=8.224(2)Å

α=90.00° β=94.64(2)° γ=90.00°

C₄H₁₂Co₂N₂O₈P₂

Neeraj, S.Forster, P. M.Rao, C. N. R.Cheetham, A. K.

Chemical Communications (2001) 24 2716

a=5.1534(7)Å b=10.7578(13)Å c=10.8329(14)Å

α=66.381(2)° β=89.058(2)° γ=81.674(2)°

C_1.71H₀CoN_0.71O_3.43P_0.86

Neeraj, S.Forster, P. M.Rao, C. N. R.Cheetham, A. K.

Chemical Communications (2001) 24 2716

a=13.4892(18)Å b=13.4892(18)Å c=14.984(3)Å

α=90.00° β=90.00° γ=120.00°

C₁₆H₁₉NaNi₃O₂₁S₂

Kim, Dae Sung Forster, Paul M.Le Toquin, Ronan Cheetham, Anthony K.

Chemical Communications (2004) 19 2148-2149

a=9.833(2)Å b=11.107(2)Å c=12.615(3)Å

α=74.884(3)° β=89.323(4)° γ=69.755(3)°

C₂H₈Co₃O₁₀S₂

Feller, Russell K.Melot, Brent C.Forster, Paul M.Cheetham, Anthony K.

Journal of Materials Chemistry (2009) 19, 17 2604

a=8.9462(6)Å b=5.2818(4)Å c=10.1259(7)Å

α=90.00° β=93.297(2)° γ=90.00°

C₂₂H₄₈Br₄NO₂Tc

Poineau, Frederic Gagliardi, Laura Forster, Paul M.Sattelberger, Alfred P.Czerwinski, Kenneth R.

Dalton Transactions (2009) 30 5954-5959

a=13.8959(8)Å b=15.2597(9)Å c=15.5741(9)Å

α=90.00° β=109.1070(10)° γ=90.00°

C₆H₁₈Br₂P₂Tc

Poineau, Frederic Weck, Philippe F.Forster, Paul M.Sattelberger, Alfred P.Czerwinski, Kenneth R.

Dalton Transactions (2009) 46 10338-10342

a=18.0903(19)Å b=9.3365(10)Å c=17.232(3)Å

α=90.00° β=115.1040(10)° γ=90.00°

C₁₂H₃₆Br₂P₄Tc

Poineau, Frederic Weck, Philippe F.Forster, Paul M.Sattelberger, Alfred P.Czerwinski, Kenneth R.

Dalton Transactions (2009) 46 10338-10342

a=9.4771(10)Å b=9.4771(10)Å c=12.123(3)Å

α=90.00° β=90.00° γ=90.00°

Br₄Cs_1.11O_1.78Tc

Poineau, Frederic Forster, Paul M.Todorova, Tanya K.Gagliardi, Laura Sattelberger, Alfred P.Czerwinski, Kenneth R.

Dalton transactions (Cambridge, England : 2003) (2012) 41, 10 2869-2872

a=13.571(3)Å b=13.571(3)Å c=9.322(2)Å

α=90.00° β=90.00° γ=120.00°

C₄H₈CoO₆

Forster, Paul M Burbank, Andrea R Livage, Carine Férey, Gérard Cheetham, Anthony K

Chemical communications (Cambridge, England) (2004) 4 368-369

a=9.9608(18)Å b=14.688(3)Å c=14.925(3)Å

α=90.00° β=90.00° γ=90.00°

C₃₂H₄₆Cl₂N₂O₂

Lee, Dong-Chan Cao, Bin Jang, Kyoungmi Forster, Paul M.

Journal of Materials Chemistry (2010) 20, 5 867

a=5.421(2)Å b=9.800(4)Å c=29.833(13)Å

α=90.125(6)° β=91.359(6)° γ=97.340(6)°

C₂₄H_23.7ClIn₃N₃O_20.35

Cairns, Amy J.Eckert, Juergen Wojtas, Lukasz Thommes, Matthias Wallacher, Dirk Georgiev, Peter A.Forster, Paul M.Belmabkhout, Youssef Ollivier, Jacques Eddaoudi, Mohamed

Chemistry of Materials (2016) 28, 20 7353

a=22.4570(3)Å b=22.4570(3)Å c=22.4570(3)Å

α=90.00° β=90.00° γ=90.00°

C₂₄H₁₅ClFe₃N₃O₁₆

Cairns, Amy J.Eckert, Juergen Wojtas, Lukasz Thommes, Matthias Wallacher, Dirk Georgiev, Peter A.Forster, Paul M.Belmabkhout, Youssef Ollivier, Jacques Eddaoudi, Mohamed

Chemistry of Materials (2016) 28, 20 7353

a=21.8720(9)Å b=21.8720(9)Å c=21.8720(9)Å

α=90.00° β=90.00° γ=90.00°

C₂₄H_25.5BrIn₃N₃O_21.25

Cairns, Amy J.Eckert, Juergen Wojtas, Lukasz Thommes, Matthias Wallacher, Dirk Georgiev, Peter A.Forster, Paul M.Belmabkhout, Youssef Ollivier, Jacques Eddaoudi, Mohamed

Chemistry of Materials (2016) 28, 20 7353

a=22.4530(4)Å b=22.4530(4)Å c=22.4530(4)Å

α=90.00° β=90.00° γ=90.00°

C₂₄H₉Fe₃N₃O₁₆

Cairns, Amy J.Eckert, Juergen Wojtas, Lukasz Thommes, Matthias Wallacher, Dirk Georgiev, Peter A.Forster, Paul M.Belmabkhout, Youssef Ollivier, Jacques Eddaoudi, Mohamed

Chemistry of Materials (2016) 28, 20 7353

a=21.9524(6)Å b=21.9524(6)Å c=21.9524(6)Å

α=90° β=90° γ=90°

C₂₃H₂₅N₄OPS

Mulla, Karimulla Aleshire, Kyle L.Forster, Paul M.Kang, Jun Yong

The Journal of organic chemistry (2016) 81, 1 77-88

a=6.3703(9)Å b=12.1555(18)Å c=15.503(2)Å

α=108.683(2)° β=98.291(2)° γ=100.081(2)°

C₂₀H₂₃N₂O₃P

Mulla, Karimulla Aleshire, Kyle L.Forster, Paul M.Kang, Jun Yong

The Journal of organic chemistry (2016) 81, 1 77-88

a=18.5763(9)Å b=9.7340(5)Å c=19.8284(10)Å

α=90° β=90° γ=90°

Cl₂Tc

Frederic Poineau Christos D. Malliakas Philippe F. Weck Brian L. Scott Erik V. Johnstone Paul M. Forster Eunja Kim Mercouri G. Kanatzidis Kenneth R. Czerwinski Alfred P. Sattelberger

Journal of the American Chemical Society (2011) 133, 8814-8817

a=8.557(3)Å b=8.557(3)Å c=3.417(2)Å

α=90.00° β=90.00° γ=90.00°

Br₃Tc

Frederic Poineau Efrain E. Rodriguez Paul M. Forster Alfred P. Sattelberger Anthony K. Cheetham Kenneth R. Czerwinski

Journal of the American Chemical Society (2009) 131, 910-911

a=11.0618(18)Å b=5.9755(10)Å c=6.3873(11)Å

α=90.00° β=90.00° γ=90.00°

Br₄Tc

Frederic Poineau Efrain E. Rodriguez Paul M. Forster Alfred P. Sattelberger Anthony K. Cheetham Kenneth R. Czerwinski

Journal of the American Chemical Society (2009) 131, 910-911

a=6.3237(5)Å b=12.1777(9)Å c=14.7397(11)Å

α=90.00° β=90.00° γ=90.00°

Cl₃Tc

Frederic Poineau Erik V. Johnstone Philippe F. Weck Eunja Kim Paul M. Forster Brian L. Scott Alfred P. Sattelberger Kenneth R. Czerwinski

Journal of the American Chemical Society (2010) 132, 15864-15865

a=10.1035(19)Å b=10.1035(19)Å c=20.120(8)Å

α=90.00° β=90.00° γ=120.00°

Bisimidazolato-nickel(ii)

C₆H₆N₄Ni

Norberto Masciocchi Fulvio Castelli Paul M. Forster Maya M. Tafoya Anthony K. Cheetham

Inorganic Chemistry (2003) 42, 6147-6152

a=7.388(3)Å b=8.755(4)Å c=10.489(4)Å

α=90.00° β=90.00° γ=90.00°

C₆H₁₈Cl₂P₂Tc

Frederic Poineau Paul M. Forster Tanya K. Todorova Laura Gagliardi Alfred P. Sattelberger Kenneth R. Czerwinski

Inorganic Chemistry (2010) 49, 6646-6654

a=17.9995(9)Å b=9.1821(5)Å c=17.0090(9)Å

α=90.00° β=115.4530(10)° γ=90.00°

Lithium hydrogen L-tartrate

(Li₁)_,(C₄H₅O₆₁)

Yeung, Hamish H.-M.Kosa, Monica Parrinello, Michele Forster, Paul M.Cheetham, Anthony K.

Crystal Growth & Design (2011) 11, 1 221

a=5.0643(2)Å b=8.3299(3)Å c=7.4469(3)Å

α=90.00° β=107.585(2)° γ=90.00°

Dilithium L-tartrate

(Li₁)₂(C₄H₄O₆₂)

Yeung, Hamish H.-M.Kosa, Monica Parrinello, Michele Forster, Paul M.Cheetham, Anthony K.

Crystal Growth & Design (2011) 11, 1 221

a=5.0445(3)Å b=14.9300(12)Å c=16.1053(12)Å

α=90.00° β=90.00° γ=90.00°

Dilithium L-tartrate

(Li₁)₂(C₄H₄O₆₂)

Yeung, Hamish H.-M.Kosa, Monica Parrinello, Michele Forster, Paul M.Cheetham, Anthony K.

Crystal Growth & Design (2011) 11, 1 221

a=5.5800(6)Å b=9.1055(6)Å c=12.0180(11)Å

α=90.00° β=90.00° γ=90.00°

Dilithium meso-tartrate

(Li₁)₂(C₄H₄O₆₂)

Yeung, Hamish H.-M.Kosa, Monica Parrinello, Michele Forster, Paul M.Cheetham, Anthony K.

Crystal Growth & Design (2011) 11, 1 221

a=6.0522(9)Å b=5.3351(8)Å c=9.8636(14)Å

α=90.00° β=100.474(9)° γ=90.00°

Dilithium D,L-tartrate

(Li₁)₂(C₄H₄O₆₂)

Yeung, Hamish H.-M.Kosa, Monica Parrinello, Michele Forster, Paul M.Cheetham, Anthony K.

Crystal Growth & Design (2011) 11, 1 221

a=15.988(10)Å b=5.0193(14)Å c=15.020(8)Å

α=90.00° β=101.50(5)° γ=90.00°

C₃₃H₃₇Mg₃N₇O₁₆

Banerjee, Debasis Finkelstein, Jeffrey Smirnov, A.Forster, Paul M.Borkowski, Lauren A.Teat, Simon J.Parise, John B.

Crystal Growth & Design (2011) 11, 6 2572

a=12.3475(5)Å b=11.1929(5)Å c=28.6734(12)Å

α=90.00° β=98.8160(10)° γ=90.00°

C₇H₇MgNO₆

Banerjee, Debasis Finkelstein, Jeffrey Smirnov, A.Forster, Paul M.Borkowski, Lauren A.Teat, Simon J.Parise, John B.

Crystal Growth & Design (2011) 11, 6 2572

a=9.9364(5)Å b=12.0694(6)Å c=7.2763(4)Å

α=90.00° β=106.4970(6)° γ=90.00°

C₄₀H₄₄Mg₄N₈O_26.50

Banerjee, Debasis Finkelstein, Jeffrey Smirnov, A.Forster, Paul M.Borkowski, Lauren A.Teat, Simon J.Parise, John B.

Crystal Growth & Design (2011) 11, 6 2572

a=13.7442(14)Å b=14.2887(15)Å c=14.1178(14)Å

α=90.00° β=104.912(2)° γ=90.00°

C₇H₃MgNO₅

Banerjee, Debasis Finkelstein, Jeffrey Smirnov, A.Forster, Paul M.Borkowski, Lauren A.Teat, Simon J.Parise, John B.

Crystal Growth & Design (2011) 11, 6 2572

a=11.4799(14)Å b=11.4799(14)Å c=14.735(3)Å

α=90.00° β=90.00° γ=120.00°

C₃₆H₁₈Co₂F₈N₄O₉

Hulvey, Zeric Ayala, Elizabeth Furman, Joshua D.Forster, Paul M.Cheetham, Anthony K.

Crystal Growth & Design (2009) 9, 11 4759

a=13.6971(15)Å b=13.6280(15)Å c=18.634(2)Å

α=90.00° β=105.895(2)° γ=90.00°

C₁₈H₈CuF₄N₂O₄

Hulvey, Zeric Ayala, Elizabeth Furman, Joshua D.Forster, Paul M.Cheetham, Anthony K.

Crystal Growth & Design (2009) 9, 11 4759

a=8.247(3)Å b=9.535(3)Å c=11.261(4)Å

α=74.189(5)° β=70.491(5)° γ=76.021(5)°

C₁₈H₈CuF₄N₂O₄

Hulvey, Zeric Ayala, Elizabeth Furman, Joshua D.Forster, Paul M.Cheetham, Anthony K.

Crystal Growth & Design (2009) 9, 11 4759

a=9.369(2)Å b=13.436(3)Å c=13.359(3)Å

α=90.00° β=104.958(6)° γ=90.00°

C₁₈H₁₀F₄N₂O₅Zn

Hulvey, Zeric Ayala, Elizabeth Furman, Joshua D.Forster, Paul M.Cheetham, Anthony K.

Crystal Growth & Design (2009) 9, 11 4759

a=8.787(2)Å b=10.340(3)Å c=10.420(3)Å

α=78.645(4)° β=79.290(4)° γ=71.291(4)°

C₁₈H₉F₄MnN₂O_4.5

Hulvey, Zeric Ayala, Elizabeth Furman, Joshua D.Forster, Paul M.Cheetham, Anthony K.

Crystal Growth & Design (2009) 9, 11 4759

a=10.5699(7)Å b=12.9603(8)Å c=13.4373(9)Å

α=90.00° β=107.936(2)° γ=90.00°

C₁₄H₉CuF₄N₂O_4.5

Hulvey, Zeric Ayala, Elizabeth Furman, Joshua D.Forster, Paul M.Cheetham, Anthony K.

Crystal Growth & Design (2009) 9, 11 4759

a=26.9256(17)Å b=12.9697(8)Å c=16.6178(10)Å

α=90.00° β=90.00° γ=90.00°

C₂₆H₂₀Eu₂N₂₂O₁₈

Arunasis Bhattacharyya Eunja Kim Philippe F. Weck Paul M. Forster Kenneth R. Czerwinski

Inorganic Chemistry (2013) 52, 761-776

a=9.5679(5)Å b=11.3093(6)Å c=11.4263(6)Å

α=61.3650(10)° β=73.8480(10)° γ=73.1370(10)°

C₁₇H₂₀EuN₁₁O₁₀

Arunasis Bhattacharyya Eunja Kim Philippe F. Weck Paul M. Forster Kenneth R. Czerwinski

Inorganic Chemistry (2013) 52, 761-776

a=8.4739(4)Å b=12.6134(7)Å c=12.7731(7)Å

α=92.7810(10)° β=102.8820(10)° γ=106.5610(10)°

C₃₀H₃₀Eu₂N₂₀O₁₈

Arunasis Bhattacharyya Eunja Kim Philippe F. Weck Paul M. Forster Kenneth R. Czerwinski

Inorganic Chemistry (2013) 52, 761-776

a=13.1674(8)Å b=10.8952(6)Å c=15.3985(9)Å

α=90.00° β=106.6330(10)° γ=90.00°

C₂₁H₂₈EuN₁₁O₁₀

Arunasis Bhattacharyya Eunja Kim Philippe F. Weck Paul M. Forster Kenneth R. Czerwinski

Inorganic Chemistry (2013) 52, 761-776

a=7.8334(14)Å b=9.8055(18)Å c=18.715(3)Å

α=85.963(3)° β=87.125(3)° γ=84.520(3)°

Zinc(II) meso-iminodisuccinate hydrate

C₈H_8.14NO_8.57Zn₂

Feller, Russell K.Forster, Paul M.Wudl, Fred Cheetham, Anthony K.

Inorganic chemistry (2007) 46, 21 8717-8721

a=10.0725(7)Å b=9.8937(6)Å c=12.0531(8)Å

α=90.00° β=105.6050(10)° γ=90.00°

Tetraaquanickel(II) 5,10-dioxo-5,10-dihydro-4,9-dioxa-pyrene-2,7-dicarboxylate

C₁₆H₁₂NiO₁₂

Feller, Russell K.Forster, Paul M.Wudl, Fred Cheetham, Anthony K.

Inorganic chemistry (2007) 46, 21 8717-8721

a=5.011(3)Å b=6.526(3)Å c=12.305(7)Å

α=76.868(8)° β=84.988(8)° γ=87.619(8)°

Br₂₅NaTc₁₂

Erik V. Johnstone Daniel J. Grant Frederic Poineau Laura Fox Paul M. Forster Longzou Ma Laura Gagliardi Kenneth R. Czerwinski Alfred P. Sattelberger

Inorganic Chemistry (2013) 52, 5660-5662

a=9.5173(5)Å b=10.5233(6)Å c=11.1412(6)Å

α=83.6700(10)° β=73.7290(10)° γ=87.4880(10)°

C₁₉H₄₂Cl_3.91NOTc_0.95

Frederic Poineau Erik V. Johnstone Paul M. Forster Longzou Ma Alfred P. Sattelberger Kenneth R. Czerwinski

Inorganic Chemistry (2012) 51, 9563-9570

a=10.1856(10)Å b=14.8529(15)Å c=17.2877(18)Å

α=90.00° β=91.214(2)° γ=90.00°

C₃₅H₇₈Cl₁₄N₂O₀Tc₂

Frederic Poineau Erik V. Johnstone Paul M. Forster Longzou Ma Alfred P. Sattelberger Kenneth R. Czerwinski

Inorganic Chemistry (2012) 51, 9563-9570

a=21.815(3)Å b=14.7166(19)Å c=16.908(2)Å

α=90.00° β=92.090(2)° γ=90.00°

C₄H₆Cl₄O₄Tc₂

Frederic Poineau Erik V. Johnstone Philippe F. Weck Eunja Kim Paul M. Forster Brian L. Scott Alfred P. Sattelberger Kenneth R. Czerwinski

Journal of the American Chemical Society (2010) 132, 15864-15865

a=6.0303(12)Å b=6.5098(13)Å c=8.3072(16)Å

α=112.082(2)° β=96.667(3)° γ=108.792(3)°

C₃₆H₁₈F₈Mn₂N₄O₉

Hulvey, Zeric Ayala, Elizabeth Furman, Joshua D.Forster, Paul M.Cheetham, Anthony K.

Crystal Growth & Design (2009) 9, 11 4759

a=13.8311(18)Å b=13.7846(19)Å c=18.904(3)Å

α=90.00° β=104.920(3)° γ=90.00°

C₁₄H₁₂CuF₄N₂O₆

Hulvey, Zeric Ayala, Elizabeth Furman, Joshua D.Forster, Paul M.Cheetham, Anthony K.

Crystal Growth & Design (2009) 9, 11 4759

a=10.3712(15)Å b=14.876(2)Å c=10.6560(15)Å

α=90.00° β=103.666(4)° γ=90.00°

Cl₃Tc

Frederic Poineau Erik V. Johnstone Philippe F. Weck Paul M. Forster Eunja Kim Kenneth R. Czerwinski Alfred P. Sattelberger

Inorganic Chemistry (2012) 51, 4915-4917

a=5.986(3)Å b=9.725(5)Å c=6.194(3)Å

α=90.00° β=108.687(6)° γ=90.00°

Cl₄Tc

Erik V. Johnstone Frederic Poineau Paul M. Forster Longzou Ma Thomas Hartmann Andrew Cornelius Daniel Antonio Alfred P. Sattelberger Kenneth R. Czerwinski

Inorganic Chemistry (2012) 51, 8462-8467

a=6.0111(4)Å b=11.5308(9)Å c=13.9334(10)Å

α=90.00° β=90.00° γ=90.00°

C₄H₄CoO_8,2(C₂H₈NO)

Paul J. Calderone Paul M. Forster Lauren A. Borkowski Simon J. Teat Mikhail Feygenson Meigan C. Aronson John B. Parise

Inorganic Chemistry (2011) 50, 2159-2167

a=6.8660(11)Å b=22.354(3)Å c=9.5820(15)Å

α=90.00° β=90.272(4)° γ=90.00°

C₄H₄NiO_8,2(C₂H₈NO)

Paul J. Calderone Paul M. Forster Lauren A. Borkowski Simon J. Teat Mikhail Feygenson Meigan C. Aronson John B. Parise

Inorganic Chemistry (2011) 50, 2159-2167

a=6.8790(4)Å b=22.3630(12)Å c=9.5220(5)Å

α=90.00° β=90.3620(10)° γ=90.00°

C₄H₄MnO_8,2(C₂H₈NO)

Paul J. Calderone Paul M. Forster Lauren A. Borkowski Simon J. Teat Mikhail Feygenson Meigan C. Aronson John B. Parise

Inorganic Chemistry (2011) 50, 2159-2167

a=8.9246(9)Å b=8.7020(9)Å c=9.2303(10)Å

α=90.00° β=98.405(2)° γ=90.00°

C₃H₅CoO_7,C₃H₁₀ON

Paul J. Calderone Paul M. Forster Lauren A. Borkowski Simon J. Teat Mikhail Feygenson Meigan C. Aronson John B. Parise

Inorganic Chemistry (2011) 50, 2159-2167

a=8.1298(8)Å b=16.1312(15)Å c=16.7808(16)Å

α=90.00° β=90.00° γ=90.00°

C₃H₅MnO_7,C₃H₁₀ON

Paul J. Calderone Paul M. Forster Lauren A. Borkowski Simon J. Teat Mikhail Feygenson Meigan C. Aronson John B. Parise

Inorganic Chemistry (2011) 50, 2159-2167

a=8.2700(7)Å b=16.2939(14)Å c=17.0155(15)Å

α=90.00° β=90.00° γ=90.00°

C₁₂H₃₆Br₄P₄Re₂

Johnstone, Erik V.Poineau, Frederic Todorova, Tanya K.Forster, Paul M.Sørensen, Lasse K Fdez Galván, Ignacio Lindh, Roland Czerwinski, Kenneth R.Sattelberger, Alfred P.

Inorganic chemistry (2016) 55, 14 7111-7116

a=18.0461(13)Å b=9.3406(7)Å c=17.1624(12)Å

α=90° β=115.1560(10)° γ=90°