The structure of 4-(3-indolyl)butyric acid
Abstract
<h2>Acta Crystallographica Section B</h2><h3>Structural Crystallography and Crystal Chemistry</h3><h3>0567-7408</h3> <h2>research papers</h2> Volume 36 Part 5 Pages 1165-1169 May 1980 <h2>The structure of 4-(3-indolyl)butyric acid</h2> K. Chandrasekhar and V. Pattabhi The Structure of 4-(3-Indolyl)butyric Acid BY K. CHANDRASEKHAR AND VASANTHA PATTABHI Department of Crystallography and Biophysics,* University of Madras, Guindy Campus, Madras-600 025, India (Received 28 November 1979; accepted 8 January 1980) Abstract C12HI3NO2 crystallizes in the monoclinic space group P2~/c with a = 21.003(3), b --" 5-114(1), c = 9.918 (2) A, fl = 93.278 (6)°, Z = 4. The structure was solved by direct methods and refined to R = 0.056 * Contribution No. 515. 0567-7408/80/051165-05501.00 for 1729 counter reflections. O-H... O bonds of length 2.644 A are observed. Introduction The best established and most widely occurring natural auxin is indolylacetic acid (IAA). Homologues of IAA © 1980 International Union of Crystallography 1166 THE STRUCTURE OF 4-(3-INDOLYL)BUTYRIC ACID such as 4-(3-indolyl)butyric acid (IBA) are also known to possess growth-regulating activity (Steward & Krikorian, 1971). The activity index, measured as a percentage of the molar concentration of indolylacetic acid inducing an elongation of 0.015 mm to the molar concentration of growth regulator inducing the same elongation, is 15 for