Abstract

Two biaxial crystals having mirror planes were experimentally investigated for optical activity. No rotation occurred in (C<sub>9</sub>H<sub>12</sub>O<sub>4</sub>)<sub>2</sub>, the only crystal of this type previously reported to be optically active. The previous report had been based on the peculiar pattern the crystal production in a polarizing microscope. In NaNO<sub>2</sub>, a ferroelectric crystal of class <i>mm</i>2, the plane of polarization was rotated 15.7°+0.5°/mm as 6328-Å light propagated down either axis. Down one axis the rotation was clockwise, down the other counterclockwise. This indicates that the structure of NaNO<sub>2</sub> consists of a right- and left-handed helix with their axes oriented along the optical axes. The angles between the helices are bisected by mirror planes.

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Egli, P. H.

P. H. Egli and L. R. Johnson, in The Art and Science of Growing Crystals, edited by J. J. Gillman (Wiley, New York, 1963), p. 194.

Federline, W.

W. Federline, Ann. Chem. 356, 271 (1907).

Frazer, B. C.

M. I. Kay and B. C. Frazer, Acta Cryst. 14, 56 (1961).

Hobden, M. V.

M. V. Hobden, Acta Cryst. A24 676 (1968).

M. V. Hobden, Acta Cryst. A25, 633 (1969).

Johnson, L. R.

P. H. Egli and L. R. Johnson, in The Art and Science of Growing Crystals, edited by J. J. Gillman (Wiley, New York, 1963), p. 194.

Kay, M. I.

M. I. Kay and B. C. Frazer, Acta Cryst. 14, 56 (1961).

Landau, L. D.

L. D. Landau and E. M. Lifshitz, Electrodynanics of Continuous Meddia (Pergamon, New York, 1960).

Lifshitz, E. M.

L. D. Landau and E. M. Lifshitz, Electrodynanics of Continuous Meddia (Pergamon, New York, 1960).

Nye, J. F.

J. F. Nye, Physical Properties of Crystals (Oxford University Press, London, 1964).

Rogers, D.

D. Rogers, Nature 171, 929 (1953).

Sawada, S.

S. Sawada et at., Phys. Rev. Letters 1, 320 (1958).

Sommerfeldt, E.

E. Sommerfeldt, Phys. Z. 7, 207 (1906).

Tartaskii, V. B.

V. B. Tartaskii, Sov. Phys. Crystallogr. 9, 377 (1964).

Other (11)

L. D. Landau and E. M. Lifshitz, Electrodynanics of Continuous Meddia (Pergamon, New York, 1960).

J. F. Nye, Physical Properties of Crystals (Oxford University Press, London, 1964).

M. V. Hobden, Acta Cryst. A24 676 (1968).

M. V. Hobden, Acta Cryst. A25, 633 (1969).

E. Sommerfeldt, Phys. Z. 7, 207 (1906).

D. Rogers, Nature 171, 929 (1953).

V. B. Tartaskii, Sov. Phys. Crystallogr. 9, 377 (1964).

W. Federline, Ann. Chem. 356, 271 (1907).

S. Sawada et at., Phys. Rev. Letters 1, 320 (1958).

M. I. Kay and B. C. Frazer, Acta Cryst. 14, 56 (1961).

P. H. Egli and L. R. Johnson, in The Art and Science of Growing Crystals, edited by J. J. Gillman (Wiley, New York, 1963), p. 194.

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